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@@ -741,3 +741,60 @@ simready_assets/903/office_door.usd filter=lfs diff=lfs merge=lfs -text
 simready_assets/892/soap_basket.usd filter=lfs diff=lfs merge=lfs -text
 simready_assets/901/plastic_tote_2.92ftx2ft.usd filter=lfs diff=lfs merge=lfs -text
 simready_assets/902/plastic_tote_2.92ftx2ft_2.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/909/plastic_barrel_2.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/912/wooden_crate_1.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/904/exit_door.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/908/plastic_barrel_1.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/914/dock_shutter_14ftx14ft_open_version.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/913/dock_shutter_10ftx10ft_open_version.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/915/stack_nest_tote_1.7x1.25_ft.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/916/warehouse_pallet_1.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/917/warehouse_pallet_2.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/918/warehouse_pallet_3.usd filter=lfs diff=lfs merge=lfs -text
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+simready_assets/920/warehouse_pallet_5.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/921/warehouse_pallet_6.usd filter=lfs diff=lfs merge=lfs -text
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+simready_assets/953/office_chair.usd filter=lfs diff=lfs merge=lfs -text
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+simready_assets/952/semi_trailer.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/959/Wall_panel_corrugated_metal.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/960/fire_alarm.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/961/fire_sprinkler.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/963/smoke_detector.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/962/large_first_aid_kit.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/954/forklift_1.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/964/scissor_lift.usd filter=lfs diff=lfs merge=lfs -text
+simready_assets/967/iron_and_ironing_board.usd filter=lfs diff=lfs merge=lfs -text

simready_assets/826/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

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+{
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+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-10T19:04:47",
+  "assets": [
+    {
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+      "features": [
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+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
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+                }
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+  ],
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+  }
+}

simready_assets/826/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

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+{
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+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-10T19:04:47",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/826/.metadata/com.nvidia.simready.packaging.bom.json

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simready_assets/826/.metadata/com.nvidia.simready.root_usds.json

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+{
+  "format_version": "1.0",
+  "entries": [
+    "outdoor_plant_7.usd"
+  ]
+}

simready_assets/826/gltf/pbr.mdl

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+/******************************************************************************
+ * Copyright 2024 NVIDIA Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of NVIDIA CORPORATION nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/859/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

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+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-11T13:47:35",
+  "assets": [
+    {
+      "asset": "dryer_frontload_7kg.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
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+            "dependencies": [
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+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
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+  }
+}

simready_assets/859/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

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+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-11T13:47:35",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/859/.metadata/com.nvidia.simready.packaging.bom.json

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simready_assets/859/.metadata/com.nvidia.simready.root_usds.json

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simready_assets/859/dryer_frontload_7kg.usd

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+version https://git-lfs.github.com/spec/v1
+oid sha256:b0a2e5232f1f972e2d7b1bd791319e224a9708cd3e0213e5871691426002df95
+size 101317634

simready_assets/859/gltf/pbr.mdl

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+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/860/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-13T22:22:04",
+  "assets": [
+    {
+      "asset": "washing_machine_topload_8kg.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "d20a86ba127aeb5051c36fc470d12ac1d0d770cf4237da45e9315e4f7ec8c249",
+    "blake3": "d4ce75e8ff383675fa63dfd2cd2927264244c66ccc96c9935c57475c8aae460e"
+  }
+}

simready_assets/860/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-13T22:22:04",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/860/.metadata/com.nvidia.simready.packaging.bom.json

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+}

simready_assets/860/.metadata/com.nvidia.simready.root_usds.json

@@ -0,0 +1,6 @@
+{
+  "format_version": "1.0",
+  "entries": [
+    "washing_machine_topload_8kg.usd"
+  ]
+}

simready_assets/860/SubUSDs/materials/pbr.mdl

@@ -0,0 +1,1004 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/860/gltf/pbr.mdl

@@ -0,0 +1,1004 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/861/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-11T21:13:24",
+  "assets": [
+    {
+      "asset": "detergent_container_1.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "8067252607f8fd802a207d79c5b2d421dc6c6bdbb8d04ccd6148f0fb460d716c",
+    "blake3": "14105c0b2d5a1f939c7cabeb268c163bea836adcecb5545ca18af86f5f5baca5"
+  }
+}

simready_assets/861/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-11T21:13:24",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/861/.metadata/com.nvidia.simready.packaging.bom.json

@@ -0,0 +1,43 @@
+{
+  "format_version": "1.0",
+  "content_root": "file:///D:/Validation/output/.packages/detergent_container_1/1.0.0",
+  "items": [
+    {
+      "relative_path": ".thumbs/256x256/detergent_container_1.usd.png",
+      "size": 17685,
+      "hash": {
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+        "blake3": "74302bd22ba6643e67e4fb79559548f7eb6a4207c422804816d3b94cc69a8cde"
+      }
+    },
+    {
+      "relative_path": "SubUSDs/textures/detergent_container_1_diffuse.png",
+      "size": 1577878,
+      "hash": {
+        "sha256-flat-1mb": "f6e4f1212459c65f761555cd86929ff09929c7312b1acc46551faccd9362e13b",
+        "sha256": "4182beb85538167a02ee9c8425cec1ac78858a9dacff681ba349f0a9ccb0b833",
+        "blake3": "dc7b6aa0d16a36f5968d7e70e9d9acb233ea1533ca08003cff29fb4c264ad528",
+        "sha256-first1m": "4b0527b1b87a9067e9f1f96b93235f51b85cc6dfd4a3ccb8bb75d87904e39aac"
+      }
+    },
+    {
+      "relative_path": "detergent_container_1.usd",
+      "size": 107189,
+      "hash": {
+        "sha256-flat-1mb": "db732a36ea7a228cc5dbc93a2ee5f50681d77e4154e81012697e38e53ef7b3c8",
+        "sha256": "19ba8db33d2c42a84e9a33b79728911da6b2b3deebedc0142ce1afb8a62d0bdf",
+        "blake3": "30c5e86f87ec39293a8bb60c07d57fd9db9b5e12539c4db758a304baba30faef"
+      }
+    },
+    {
+      "relative_path": "gltf/pbr.mdl",
+      "size": 42240,
+      "hash": {
+        "sha256-flat-1mb": "0ea567c192a18e6835ba556207f797ebe90850414ac832952c61c571cff22a0d",
+        "sha256": "eeed10b53c18d789f94a24a3a6b996c49668ae2d5b6a909bae3420f2beb16fc8",
+        "blake3": "9e577cb4dd7efe74b8418e38467a9e1c7056625fc127599c85a36596c6b62a59"
+      }
+    }
+  ]
+}

simready_assets/861/.metadata/com.nvidia.simready.root_usds.json

@@ -0,0 +1,6 @@
+{
+  "format_version": "1.0",
+  "entries": [
+    "detergent_container_1.usd"
+  ]
+}

simready_assets/861/gltf/pbr.mdl

@@ -0,0 +1,1004 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/892/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T17:22:50",
+  "assets": [
+    {
+      "asset": "soap_basket.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "41ca04ce942a99e1476b77f569a42579814f323765f61b4e5e453eaca000255d",
+    "blake3": "c3414103a335894f8b646b237103f29c130f56c55deeb186e7de6431b5e52128"
+  }
+}

simready_assets/892/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T17:22:50",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/892/.metadata/com.nvidia.simready.packaging.bom.json

@@ -0,0 +1,63 @@
+{
+  "format_version": "1.0",
+  "content_root": "file:///E:/validate/Output/.packages/soap_basket/1.0.0",
+  "items": [
+    {
+      "relative_path": ".thumbs/256x256/soap_basket.usd.png",
+      "size": 39333,
+      "hash": {
+        "sha256-flat-1mb": "93efe3abb8ea255ec1b8b9db5374473de60a3705a9b2e6cdbbd6ab32a0cfba56",
+        "sha256": "3e44e375ceb9a07e14f75e82c3c6f37b58e9301dd1890c69b7c127ac2793ba1f",
+        "blake3": "c375c880452c91541fb7d82fd3fdd37999dce9a02cb5b90dc38d9994aa6e6e6c"
+      }
+    },
+    {
+      "relative_path": "SubUSDs/textures/soap_basket_bottle_diffuse.jpg",
+      "size": 4170679,
+      "hash": {
+        "sha256-flat-1mb": "007da732dc88c5d3175ce4dd4a0c5cfe212eb0ecadc296a3472d9e95c3507bed",
+        "sha256": "a2e6edeb76395818f2600e139b497f70e2fd5eb66a911ad1e3700ca8a049fe26",
+        "blake3": "0a14fa8423cfe8f7a7d421d591be269c4975db4dcef3b8bff9b80c164b1fcf9e",
+        "sha256-first1m": "8faef83a5c5b148b869cf96a0799c401851f3bf9cdb1de26d6f561ec6cce5d12"
+      }
+    },
+    {
+      "relative_path": "SubUSDs/textures/soap_basket_diffuse.jpg",
+      "size": 39491,
+      "hash": {
+        "sha256-flat-1mb": "22e1c94b50905f23f05dc7eaf1757fcc7e76f3e3a2c195faf4bb91d1faa738a7",
+        "sha256": "ff0ab29b7109e699a3b2c723726291c057004d753ac59f893b778d379451fb42",
+        "blake3": "2b9df70ca2e820c3464cfb2af848aceabe5b2ed0c323a30068be3718c77c4a4a"
+      }
+    },
+    {
+      "relative_path": "SubUSDs/textures/soap_basket_gallen_diffuse.jpg",
+      "size": 3626438,
+      "hash": {
+        "sha256-flat-1mb": "d3bdde393eae1258308112e33d7917b49affc14574097bcba24c971d8f48d6bd",
+        "sha256": "04a40b15923ffcf5faf849e95a4849a2be07d15bfab38f9d3db591bbcb9cc867",
+        "blake3": "498fb1fa902afd69065615a8489ce82efb5024d1cf9167f429bd3ca4733f582a",
+        "sha256-first1m": "c440a078195510b99d87bc4f89d41549aa617bc45759da2fd645c36b5b46e5d9"
+      }
+    },
+    {
+      "relative_path": "gltf/pbr.mdl",
+      "size": 43800,
+      "hash": {
+        "sha256-flat-1mb": "f7013dcb99f4ad5c79b3b53c2b379598d790170e11a0aef8891ceef8c9bfc51c",
+        "sha256": "2c7c14d7bbf7cacea990f90e8ecc92700d8a7fe9805e44970096796e2be88b78",
+        "blake3": "3f0cb5ffe7e319677743a74dba7fdb0b2b11c3e40cc4b2d69277db595f52cbec"
+      }
+    },
+    {
+      "relative_path": "soap_basket.usd",
+      "size": 37715822,
+      "hash": {
+        "sha256-flat-1mb": "e22184a7d19cc56f0285825444ae7b654d31d704d0a2da59f636a2b5cadf8799",
+        "sha256": "1d7f23c78872f56a3fde26633f64e7b99bff51788e4a5665bfe91007f747df68",
+        "blake3": "72730356f053351d88bf423d42349cbac2a48af95b97e2654b4807faca9e11ef",
+        "sha256-first1m": "00be7ad4e6f5c440fd02024a67e970e0b447d611ca2bf630773fcaee52fa220e"
+      }
+    }
+  ]
+}

simready_assets/892/.metadata/com.nvidia.simready.root_usds.json

@@ -0,0 +1,6 @@
+{
+  "format_version": "1.0",
+  "entries": [
+    "soap_basket.usd"
+  ]
+}

simready_assets/892/gltf/pbr.mdl

@@ -0,0 +1,1027 @@
+/******************************************************************************
+ * Copyright 2024 NVIDIA Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of NVIDIA CORPORATION nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/893/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T14:19:21",
+  "assets": [
+    {
+      "asset": "fabric_softener_box.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "b6bfa3f6ccba188c37e97ff5adf72c8ed8910da0986c4b43faa6b3f99bdca3d8",
+    "blake3": "95e4e01625e02b50b29d4c6c1d4a0f7f57e9a4211786b5b9bef66c6150b871e3"
+  }
+}

simready_assets/893/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T14:19:22",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/893/.metadata/com.nvidia.simready.packaging.bom.json

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+{
+  "format_version": "1.0",
+  "content_root": "file:///D:/Validation/output/.packages/fabric_softener_box/1.0.0",
+  "items": [
+    {
+      "relative_path": ".thumbs/256x256/fabric_softener_box.usd.png",
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+      }
+    },
+    {
+      "relative_path": "SubUSDs/textures/fabric_softener_box_1_diffuse.png",
+      "size": 2230051,
+      "hash": {
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+        "sha256-first1m": "2955cf0eb13da0b901ecc49b0d25d18389f8de1f9b6b78127910fbdfe45ba4f1"
+      }
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+    {
+      "relative_path": "fabric_softener_box.usd",
+      "size": 12146,
+      "hash": {
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+        "blake3": "00659378b9a3f9bd7a4e598010a98f8a83317c1a7874e1a10d45f5380d722e2b"
+      }
+    },
+    {
+      "relative_path": "gltf/pbr.mdl",
+      "size": 42240,
+      "hash": {
+        "sha256-flat-1mb": "0ea567c192a18e6835ba556207f797ebe90850414ac832952c61c571cff22a0d",
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+      }
+    }
+  ]
+}

simready_assets/893/.metadata/com.nvidia.simready.root_usds.json

@@ -0,0 +1,6 @@
+{
+  "format_version": "1.0",
+  "entries": [
+    "fabric_softener_box.usd"
+  ]
+}

simready_assets/893/gltf/pbr.mdl

@@ -0,0 +1,1004 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/894/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T15:24:25",
+  "assets": [
+    {
+      "asset": "stain_remover_box.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "0b31724f99836c204573432248ac03b7ffed1ad6391dd1ae43c0ff1fde6d55f2",
+    "blake3": "1ad931d0c8c9230729768a2002eaf06053d0837657cb02921530898a3cfefd49"
+  }
+}

simready_assets/894/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T15:24:25",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/894/.metadata/com.nvidia.simready.packaging.bom.json

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+{
+  "format_version": "1.0",
+  "content_root": "file:///D:/Validation/output/.packages/stain_remover_box/1.0.0",
+  "items": [
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+      }
+    },
+    {
+      "relative_path": "gltf/pbr.mdl",
+      "size": 42240,
+      "hash": {
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+      }
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+    {
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+      "size": 19026,
+      "hash": {
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+    }
+  ]
+}

simready_assets/894/.metadata/com.nvidia.simready.root_usds.json

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+{
+  "format_version": "1.0",
+  "entries": [
+    "stain_remover_box.usd"
+  ]
+}

simready_assets/894/gltf/pbr.mdl

@@ -0,0 +1,1004 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/895/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T16:25:54",
+  "assets": [
+    {
+      "asset": "laundry_pod_box.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "54dd24d33145aa724734cb83395ff77452efd37bf64465170717d9c4755207a6",
+    "blake3": "14a94e0045ad61c222cd9b95234c12933d34ccf8c97d243b5611d232a3e5ddba"
+  }
+}

simready_assets/895/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-12T16:25:54",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/895/.metadata/com.nvidia.simready.packaging.bom.json

@@ -0,0 +1,43 @@
+{
+  "format_version": "1.0",
+  "content_root": "file:///D:/Validation/output/.packages/laundry_pod_box/1.0.0",
+  "items": [
+    {
+      "relative_path": ".thumbs/256x256/laundry_pod_box.usd.png",
+      "size": 42806,
+      "hash": {
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+        "blake3": "4908eddf1272e7e5c72a4a04f6ff2181bdfd7ad21ab86e655474c42e0aeb7488"
+      }
+    },
+    {
+      "relative_path": "SubUSDs/textures/laundry_pod_box_1_diffuse.png",
+      "size": 2698189,
+      "hash": {
+        "sha256-flat-1mb": "3a5a1144f89f0c36be6c500aa8238b1932e01a4325e2636d39346618666ca361",
+        "sha256": "b91596b565c27da9fa999da956a16fc3d914281a6fa1e17c231c65cb60a7d4c5",
+        "blake3": "a3452eb92c9da39934a813613f82fe782bedd97359625b3acb88f3b6ce320561",
+        "sha256-first1m": "e2222123f4ecd788edf2eeb12b4a3f062689de465e591111fb9e3f8a7943f76b"
+      }
+    },
+    {
+      "relative_path": "gltf/pbr.mdl",
+      "size": 42240,
+      "hash": {
+        "sha256-flat-1mb": "0ea567c192a18e6835ba556207f797ebe90850414ac832952c61c571cff22a0d",
+        "sha256": "eeed10b53c18d789f94a24a3a6b996c49668ae2d5b6a909bae3420f2beb16fc8",
+        "blake3": "9e577cb4dd7efe74b8418e38467a9e1c7056625fc127599c85a36596c6b62a59"
+      }
+    },
+    {
+      "relative_path": "laundry_pod_box.usd",
+      "size": 36637,
+      "hash": {
+        "sha256-flat-1mb": "b241d40b42952c3ab29fb249e3114864047efb02d743da5c1e6ece6a9740be48",
+        "sha256": "56bc27222c7b4f8ca66ca07f758ebdd34bc7ac1a8a8769621d3ff9be5efa0367",
+        "blake3": "db5b3f23b1f01749c660497aed20a22ea36de2b899fcd733e00a07e675c9720f"
+      }
+    }
+  ]
+}

simready_assets/895/.metadata/com.nvidia.simready.root_usds.json

@@ -0,0 +1,6 @@
+{
+  "format_version": "1.0",
+  "entries": [
+    "laundry_pod_box.usd"
+  ]
+}

simready_assets/895/gltf/pbr.mdl

@@ -0,0 +1,1004 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/896/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-14T16:22:15",
+  "assets": [
+    {
+      "asset": "wet_floor_sign_board.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "a687c4f53467ddfea9255581e3c1755cb9615812ad6b9c7814684d18959985b3",
+    "blake3": "9af0d78fc666371f1a9718d7d7edda810cc4c30cca00ce1a7783ebeb99157bfd"
+  }
+}

simready_assets/896/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-14T16:22:15",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}

simready_assets/896/.metadata/com.nvidia.simready.packaging.bom.json

@@ -0,0 +1,43 @@
+{
+  "format_version": "1.0",
+  "content_root": "file:///E:/validate/Output/.packages/wet_floor_sign_board/1.0.0",
+  "items": [
+    {
+      "relative_path": ".thumbs/256x256/wet_floor_sign_board.usd.png",
+      "size": 15595,
+      "hash": {
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+        "blake3": "9c50193b834bcb99bee21595bb5282676ae442e1b76e528cc333f4f9e0cf339f"
+      }
+    },
+    {
+      "relative_path": "SubUSDs/textures/wet_floor_sign_board_diffuse.jpg",
+      "size": 399185,
+      "hash": {
+        "sha256-flat-1mb": "038edfcddbd0d161e8f4656020f2ae96a6d4d510dc29b721374ae5f0f274ab99",
+        "sha256": "6a7cec2c407fafaf3b508eb534777b75d97608404a89fa4290455e4f10d71613",
+        "blake3": "f1ea13dcc2766d6159eadddffab9bf1c079d70904f1c0f79fe2177da9e89af1a"
+      }
+    },
+    {
+      "relative_path": "gltf/pbr.mdl",
+      "size": 43800,
+      "hash": {
+        "sha256-flat-1mb": "f7013dcb99f4ad5c79b3b53c2b379598d790170e11a0aef8891ceef8c9bfc51c",
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+        "blake3": "3f0cb5ffe7e319677743a74dba7fdb0b2b11c3e40cc4b2d69277db595f52cbec"
+      }
+    },
+    {
+      "relative_path": "wet_floor_sign_board.usd",
+      "size": 1691653,
+      "hash": {
+        "sha256-flat-1mb": "0d102812dc368c3bfb9f756b8daf4a53a83fd0ac0c70bfa84225c15619f30105",
+        "sha256": "469737bb4b40aa4646968f8dd1177821e4b675ba117579f276dd98368ec5874d",
+        "blake3": "9ab5e4b633a697165b4f894930859cb42168af2a24c58fa9a89ace09df4e0103",
+        "sha256-first1m": "0e971ddda3ba157e99d8a00361e89314b815ab4bb18b240a9a89f1e9399bc17c"
+      }
+    }
+  ]
+}

simready_assets/896/.metadata/com.nvidia.simready.root_usds.json

@@ -0,0 +1,6 @@
+{
+  "format_version": "1.0",
+  "entries": [
+    "wet_floor_sign_board.usd"
+  ]
+}

simready_assets/896/gltf/pbr.mdl

@@ -0,0 +1,1027 @@
+/******************************************************************************
+ * Copyright 2024 NVIDIA Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of NVIDIA CORPORATION nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+mdl 1.8;
+
+import ::anno::*;
+import ::base::*;
+import ::df::*;
+import ::math::*;
+import ::state::*;
+import ::tex::*;
+import ::scene::*;
+import ::limits::*;
+
+export enum gltf_alpha_mode {
+    opaque,
+    mask,
+    blend
+};
+
+export enum gltf_wrapping_mode {
+    clamp_to_edge = 33071,
+    mirrored_repeat = 33648,
+    repeat = 10497
+};
+
+export struct gltf_texture_lookup_value
+{
+    bool valid = false;
+    float4 value = float4(0.0, 0.0, 0.0, 1.0);
+};
+
+export struct gltf_normal_texture_lookup_value
+{
+    bool valid = false;
+    float3 value = float3(0.0);
+};
+
+float compute_opacity(gltf_alpha_mode mode, float alpha, float cutoff) {
+    switch (mode) {
+        case mask:
+            return alpha < cutoff ? 0.0 : 1.0;
+        case blend:
+            return alpha;
+        case opaque:
+            return 1.0;
+    }
+}
+
+float4 gltf_prepare_tex_float4(gltf_texture_lookup_value sample, float4 default_value = float4(1.0)) {
+    return sample.valid ? sample.value : default_value;
+}
+
+float3 gltf_prepare_tex_float3(gltf_texture_lookup_value sample, float3 default_value = float3(1.0)) {
+    return sample.valid ? float3(sample.value.x, sample.value.y, sample.value.z) : default_value;
+}
+
+float3 gltf_prepare_normal(gltf_normal_texture_lookup_value sample) {
+    return sample.valid ? sample.value : state::normal();
+}
+
+float gltf_prepare_occlusion(gltf_texture_lookup_value sample, float occlusion_strength) {
+    float occulusion = sample.valid ? sample.value.x : 1.0;
+    return math::lerp(1.0, occulusion, occlusion_strength);
+}
+
+color gltf_perpare_emission(gltf_texture_lookup_value sample, color emissive_factor) {
+    return emissive_factor * color(gltf_prepare_tex_float3(sample));
+}
+
+::tex::wrap_mode convert_wrap_mode(gltf_wrapping_mode mode)
+{
+    if (mode == clamp_to_edge)
+        return ::tex::wrap_clamp;
+    if (mode == mirrored_repeat)
+        return ::tex::wrap_mirrored_repeat;
+
+    return ::tex::wrap_repeat;
+}
+
+float2 khr_texture_transform_apply(
+    float2 coord,
+    float2 offset,
+    float rotation,
+    float2 scale
+)
+{
+    // MDL expects the texture coordinate origin at the bottom left (gltf at top left)
+    // Assuming the renderer follows the MDL specification in which case the coordinates
+    // have been flipped either while loading the glTF geometry or while setting up the state.
+
+    // Undo the flipping for the transformation to get into the original glTF texture space.
+    coord = float2(coord.x, 1.0f - coord.y);
+
+    // first scale
+    coord = coord * scale;
+    // then rotate
+    float cos_rotation = ::math::cos(rotation);
+    float sin_rotation = ::math::sin(rotation);
+    coord = float2(cos_rotation * coord.x + sin_rotation * coord.y, cos_rotation * coord.y - sin_rotation * coord.x);
+    // then translate
+    coord = coord + offset;
+
+    // flip back
+    coord = float2(coord.x, 1.0f - coord.y);
+    return coord;
+}
+
+export gltf_texture_lookup_value gltf_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Texture Lookup"),
+    anno::description("Function to read a color or color with alpha channel texture.")
+]]
+{
+    gltf_texture_lookup_value tex_ret;
+    if (!tex::texture_isvalid(texture))
+        return tex_ret;
+
+    float3 tex_coord3 = state::texture_coordinate(tex_coord_index);
+    float2 tex_coord = khr_texture_transform_apply(
+        coord: float2(tex_coord3.x, tex_coord3.y),
+        offset: offset,
+        rotation: rotation,
+        scale: scale);
+
+    tex_ret.value = tex::lookup_float4(
+        tex: texture,
+        coord: tex_coord,
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export gltf_normal_texture_lookup_value gltf_normal_texture_lookup(
+    uniform texture_2d texture = texture_2d()
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Texture"),
+        anno::description("Texture File")
+    ]],
+    uniform float normal_scale_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Source"),
+        anno::display_name("Normal Scale Factor"),
+        anno::description("Strength of the base layer normal mapping."),
+        anno::enable_if("::tex::texture_isvalid(texture)")
+    ]],
+    uniform int tex_coord_index = 0
+    [[
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Texture coordinate set (UV-Set). KHR_texture_transform overrides the textureInfo texCoord value if supplied."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform int tex_tangent_index = 0
+    [[
+        anno::hidden(),
+        anno::in_group("Source"),
+        anno::display_name("Coordinate Set"),
+        anno::description("Tangent to be to construct the tangent frame."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform float2 offset = float2(0.0f, 0.0)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Offset"),
+        anno::description("The offset of the UV coordinate origin as a factor of the texture dimensions."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Texture Transform"),
+        anno::display_name("Rotation"),
+        anno::description("Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform float2 scale = float2(1.0f, 1.0f)
+    [[
+        anno::in_group("Texture Transform"),
+        anno::display_name("Scale"),
+        anno::description("The scale factor applied to the components of the UV coordinates."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+
+    uniform gltf_wrapping_mode wrap_s = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap S"),
+        anno::description("S (U) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]],
+    uniform gltf_wrapping_mode wrap_t = repeat
+    [[
+        anno::in_group("Sampler"),
+        anno::display_name("Wrap T"),
+        anno::description("T (V) wrapping mode."),
+        anno::enable_if("::tex::texture_isvalid(texture) && normal_scale_factor>0.0")
+    ]]
+)
+[[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Normal Texture Lookup"),
+    anno::description("Function to read a normal texture.")
+]]
+{
+    gltf_normal_texture_lookup_value tex_ret;
+    if (!::tex::texture_isvalid(texture))
+        return tex_ret;
+
+    tex_ret.value = base::tangent_space_normal_texture(
+        texture: texture,
+        factor: normal_scale_factor,
+        uvw: base::transform_coordinate(
+            transform: base::rotation_translation_scale(
+                rotation: float3(0, 0, rotation),
+                translation: float3(offset.x, offset.y, 0),
+                scaling: float3(scale.x, scale.y, 1)
+            ),
+            coordinate: base::texture_coordinate_info(
+                position: state::texture_coordinate(tex_coord_index),
+                tangent_u: state::texture_tangent_u(tex_tangent_index),
+                tangent_v: state::texture_tangent_v(tex_tangent_index)
+            )
+        ),
+        wrap_u: convert_wrap_mode(wrap_s),
+        wrap_v: convert_wrap_mode(wrap_t));
+    tex_ret.valid = true;
+    return tex_ret;
+}
+
+export material gltf_material(
+    // base color
+    uniform color base_color_factor = color(1.0)
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Factor"),
+        anno::description("The base color of the material. Multiplied to the 'Base Color Texture' if available.")
+    ]],
+
+    gltf_texture_lookup_value base_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Base Color Texture"),
+        anno::description("The base color of the material. Influenced by the 'Base Color Factor'.")
+    ]],
+
+    // KHR_materials_specular
+    uniform float specular_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Specular"),
+        anno::display_name("Specular Factor"),
+        anno::description("The strength of the specular reflection. Multiplied to the 'Specular Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Texture"),
+        anno::description("A texture that defines the strength of the specular reflection, stored in the alpha (A) channel. This will be multiplied by the 'Specular Factor'.")
+    ]],
+    uniform color specular_color_factor = color(1.0)
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Factor"),
+        anno::description("The F0 color of the specular reflection (linear RGB). Multiplied to the 'Specular Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Specular"),
+        anno::display_name("Specular Color Texture"),
+        anno::description("A texture that defines the F0 color of the specular reflection, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by 'Specular Color Factor'.")
+    ]],
+
+    // metallic roughness
+    uniform float metallic_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metallic Factor"),
+        anno::description("The metalness of the material. Select between dielectric (0.0) and metallic (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+
+    uniform float roughness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Roughness Factor"),
+        anno::description("The roughness of the material. Select between very glossy (0.0) and dull (1.0). Multiplied to the 'Metal/Rough Texture' value if available.")
+    ]],
+    gltf_texture_lookup_value metallic_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("Metal/Rough Texture"),
+        anno::description("Metallic in the red or blue component and roughness in the green component. Influenced by the 'Metallic Factor' and 'Roughness Factor'."),
+        anno::enable_if("metallic_factor>0.0 || roughness_factor>0.0")
+    ]],
+
+    // KHR_materials_anisotropy
+    uniform float anisotropy_strength = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Strength"),
+        anno::description("The anisotropy strength. When the anisotropy texture is present, this value is multiplied by the texture's blue channel.")
+    ]],
+    uniform float anisotropy_rotation = 0.0
+    [[
+        anno::hard_range(0.0, 2.0 * ::math::PI),
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Rotation"),
+        anno::description("The rotation of the anisotropy in tangent, bitangent space, measured in radians counter-clockwise from the tangent. When the anisotropy texture is present, this value provides additional rotation to the vectors in the texture.")
+    ]],
+    gltf_texture_lookup_value anisotropy_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Anisotropy"),
+        anno::display_name("Anisotropy Texture"),
+        anno::description("The anisotropy texture. Red and green channels represent the anisotropy direction in [− 1, 1] tangent, bitangent space to be rotated by the anisotropy rotation. The blue channel contains strength as [0, 1] to be multiplied by the anisotropy strength.")
+    ]],
+
+    // KHR_materials_ior
+    uniform float ior = 1.5
+    [[
+        anno::hard_range(1.0, 5.0),
+        anno::in_group("Metallic Roughness"),
+        anno::display_name("IOR"),
+        anno::description("The index of refraction.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // KHR_materials_transmission
+    uniform float transmission_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Factor"),
+        anno::description("The base percentage of light that is transmitted through the surface. Multiplied to the 'Transmission Texture' if available.")
+    ]],
+    gltf_texture_lookup_value transmission_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Transmission"),
+        anno::display_name("Transmission Texture"),
+        anno::description("A texture that defines the transmission percentage of the surface, stored in the R channel. Influenced by the 'Transmission Factor'."),
+        anno::enable_if("transmission_factor>0")
+    ]],
+
+    // KHR_materials_sheen
+    uniform color sheen_color_factor = color(0.0)
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Factor"),
+        anno::description("The sheen color in linear space. Multiplied to the 'Sheen Color Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_color_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Color Texture"),
+        anno::description("The sheen color (RGB). The sheen color is in sRGB transfer function. Influenced by the 'Sheen Color Factor'.")
+    ]],
+    uniform float sheen_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Factor"),
+        anno::description("The sheen roughness. Multiplied to the 'Sheen Roughness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value sheen_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Sheen"),
+        anno::display_name("Sheen Roughness Texture"),
+        anno::description("The sheen roughness (Alpha) texture. Influenced by the 'Sheen Roughness Factor'.")
+    ]],
+
+    // KHR_materials_clearcoat
+    uniform float clearcoat_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Factor"),
+        anno::description("Strength of the clearcoat. Multiplied to the 'Clearcoat Texture' if available.")
+    ]],
+    gltf_texture_lookup_value clearcoat_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Texture"),
+        anno::description("Strength of the clearcoat. Influenced by the 'Clearcoat Factor'."),
+        anno::enable_if("clearcoat_factor>0")
+    ]],
+    uniform float clearcoat_roughness_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Factor"),
+        anno::description("The clearcoat layer roughness. Multiplied to the 'Clearcoat Roughness Texture' if available."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+    gltf_texture_lookup_value clearcoat_roughness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Roughness Texture"),
+        anno::description("The clearcoat layer roughness texture. Influenced by the 'Clearcoat Roughness Texture'."),
+        anno::enable_if("clearcoat_factor>0.0 && clearcoat_roughness_factor>0.0")
+    ]],
+    gltf_normal_texture_lookup_value clearcoat_normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Clearcoat"),
+        anno::display_name("Clearcoat Normal"),
+        anno::description("The clearcoat normal map texture."),
+        anno::enable_if("clearcoat_factor>0.0")
+    ]],
+
+    // KHR_materials_iridescence
+    uniform float iridescence_factor = 0.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Factor"),
+        anno::description("Strength of the iridescence. Multiplied to the 'Iridescence Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Texture"),
+        anno::description("Strength of the iridescence. Uses only the red channel, assuming linear space. Influenced by the 'Iridescence Factor'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+    uniform float iridescence_ior = 1.3
+    [[
+        anno::soft_range(1.0, 5.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence IOR"),
+        anno::description("The index of refraction of the dielectric thin-film layer.")
+    ]],
+    uniform float iridescence_thickness_minimum = 100
+    [[
+        anno::soft_range(0.0, 600.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Minimum"),
+        anno::description("The minimum thickness of the thin-film layer given in nanometers.")
+    ]],
+    uniform float iridescence_thickness_maximum = 400
+    [[
+        anno::soft_range(0.0, 1000.0),
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Maximum"),
+        anno::description("The maximum thickness of the thin-film layer given in nanometers. Used as thickness if no 'Iridescence Thickness Texture' if available.")
+    ]],
+    gltf_texture_lookup_value iridescence_thickness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Iridescence"),
+        anno::display_name("Iridescence Thickness Texture"),
+        anno::description("The thickness texture of the thin-film layer.  Uses only the red channel, assuming linear space. Used to blend between 'Iridescence Thickness Minimum' and 'Iridescence Thickness Maximum'."),
+        anno::enable_if("iridescence_factor>0")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // KHR_materials_volume
+    uniform bool thin_walled = true
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Thin-walled"),
+        anno::description("If true the material is thin-walled. Otherwise the material is a volume boundary. The doubleSided property has no effect on volume boundaries. Note, the thickness parameters are ignored since ray-tracing is used to compute the traveled distance within the volume.")
+    ]],
+    uniform float attenuation_distance = 0.0
+    [[
+        anno::soft_range(0.0, ::limits::FLOAT_MAX),
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Distance"),
+        anno::description("Density of the medium given as the average distance that light travels in the medium before interacting with a particle. The value is given in world space. A value 0.0 disables it")
+    ]],
+    uniform color attenuation_color = color(1.0)
+    [[
+        anno::in_group("Volume"),
+        anno::display_name("Attenuation Color"),
+        anno::description("The color that white light turns into due to absorption when reaching the attenuation distance.")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff  = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0(gltf), or displayColor(usd)")
+    ]],
+
+    uniform bool use_vertex_color_alpha = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multipy the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex opacity primvar usually the fourth component of COLOR_0(gltf), or displayOpacity(usd)")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Metallic-Roughness"),
+    anno::description("Metallic-Roughness Material that takes the GLTF PBR model and KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+
+    float4 base_float4 = gltf_prepare_tex_float4(base_color_texture) * ::scene::data_lookup_float4(vertex_color_name, float4(1.0)); // apply vertex color
+    color base_color = base_color_factor * color(base_float4.x, base_float4.y, base_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha == 1 ? base_float4.w : 1.0) * ((vertex_color_name != vertex_opacity_name) ? ::scene::data_lookup_float(vertex_opacity_name, float(1.0)) : 1.0);
+
+    float3 metallic_roughness = gltf_prepare_tex_float3(metallic_roughness_texture);
+    float metallic = metallic_factor * metallic_roughness.z;
+    float roughness = roughness_factor * metallic_roughness.y;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // KHR_materials_specular
+    // ------------------------------------------------------------------------
+    color specular_color = color(gltf_prepare_tex_float3(specular_color_texture)) * specular_color_factor;
+    float specular = gltf_prepare_tex_float4(specular_texture).w * specular_factor;
+
+    // KHR_materials_transmission
+    // ------------------------------------------------------------------------
+    float transmission = gltf_prepare_tex_float4(transmission_texture).x * transmission_factor;
+
+    // KHR_materials_sheen
+    // ------------------------------------------------------------------------
+    color sheen_color = color(gltf_prepare_tex_float3(sheen_color_texture)) * sheen_color_factor;
+    float sheen_roughness = gltf_prepare_tex_float4(sheen_roughness_texture).w * sheen_roughness_factor;
+
+    // KHR_materials_clearcoat
+    // ------------------------------------------------------------------------
+    float clearcoat_blend = gltf_prepare_tex_float3(clearcoat_texture).x * clearcoat_factor;
+    float clearcoat_roughness = gltf_prepare_tex_float3(clearcoat_roughness_texture).y * clearcoat_roughness_factor;
+    float clearcoat_roughness2 = clearcoat_roughness * clearcoat_roughness;
+    float3 clearcoat_normal = gltf_prepare_normal(clearcoat_normal_texture);
+    float grazing_refl_coat = math::max((1.0 - clearcoat_roughness), 0.0);
+
+    // KHR_materials_iridescence
+    // ------------------------------------------------------------------------
+    float iridescence_strength = gltf_prepare_tex_float3(iridescence_texture).x * iridescence_factor;
+    float iridescence_thickness = math::lerp(iridescence_thickness_minimum, iridescence_thickness_maximum, gltf_prepare_tex_float3(iridescence_thickness_texture).x);
+
+    // KHR_materials_anisotropy
+    // ------------------------------------------------------------------------
+    float3 anisotropy_tex = gltf_prepare_tex_float3(anisotropy_texture, float3(1.0, 0.5, 1.0));
+    float2 anisotropy_tex_dir = float2(anisotropy_tex.x * 2.0 - 1.0, anisotropy_tex.y * 2.0 - 1.0);
+    float2 anisotropy_rot = float2(math::cos(anisotropy_rotation), math::sin(anisotropy_rotation));
+    float2 anisotropy_dir = float2x2(anisotropy_rot.x, anisotropy_rot.y, -anisotropy_rot.y, anisotropy_rot.x) * math::normalize(anisotropy_tex_dir);
+    float3 anisotropy_tangent_u = state::texture_tangent_u(0) * anisotropy_dir.x + state::texture_tangent_v(0) * anisotropy_dir.y;
+    float anisotropy = anisotropy_strength * anisotropy_tex.z;
+
+    // metallic roughness model
+    // ------------------------------------------------------------------------
+
+    // compute final roughness by squaring the "roughness" parameter
+    float roughness2 = roughness * roughness;
+
+    float anisotropy_roughness_u = math::lerp(roughness2, 1.0, anisotropy * anisotropy);
+    float anisotropy_roughness_v = roughness2;
+
+    // reduce the reflectivity at grazing angles to avoid "dark edges"
+    // for high roughness due to the layering
+    float grazing_refl = math::max((1.0 - roughness), 0.0);
+
+    // fresnel term based on ior
+    float f0 = math::pow((ior - 1.0)/(ior + 1.0), 2.0);
+
+    // for the dielectric component we layer the glossy component on top of the diffuse one,
+    // the glossy layer has no color tint
+    bsdf dielectric_component = df::color_custom_curve_layer(
+        weight: color(1.0), // roughness is used to weight between diffuse and glossy
+        normal_reflectivity: math::min(f0 * specular_color, color(1.0)) * specular,
+        grazing_reflectivity: color(grazing_refl * specular),
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            roughness_u: anisotropy_roughness_u,
+            roughness_v: anisotropy_roughness_v,
+            tangent_u: anisotropy_tangent_u),
+        base: df::weighted_layer(
+            weight: transmission,
+            base: df::diffuse_reflection_bsdf(tint: base_color * occlusion),
+            layer: df::microfacet_ggx_vcavities_bsdf(
+                roughness_u: roughness2,
+                tint: base_color * occlusion,
+                mode: df::scatter_transmit)),
+        normal: normal
+        );
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    bsdf dielectric_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: dielectric_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: dielectric_component
+        )
+    );
+
+    // the metallic component doesn't have a diffuse component,
+    // its only glossy base_color is applied to tint it
+    bsdf metallic_component = df::microfacet_ggx_vcavities_bsdf(
+        tint: base_color * occlusion,
+        roughness_u: anisotropy_roughness_u,
+        roughness_v: anisotropy_roughness_v,
+        tangent_u: anisotropy_tangent_u);
+
+    // apply iridescence and make the strength adjustable using a weighted layer
+    // according to KHR_materials_iridescence spec: using dielectric thin film fresnel for metals, too
+    color base_color_sqrt = math::min(math::sqrt(math::saturate(base_color * occlusion)), color(0.99f));
+    color dielectric_ior = (color(1.0f) + base_color_sqrt) / (color(1.0f) - base_color_sqrt);
+    bsdf metallic_component_with_thin_film = df::weighted_layer(
+        weight: iridescence_strength,
+        base: metallic_component,
+        layer: df::thin_film(
+            thickness: iridescence_thickness,
+            ior: color(iridescence_ior),
+            base: df::fresnel_factor(
+                ior: dielectric_ior,
+                extinction_coefficient: color(0.0f),
+                base: df::microfacet_ggx_vcavities_bsdf(roughness_u: roughness2))
+        )
+    );
+
+    // apply sheen to the dielectric component
+    // add the sheen_color as weight in an outer layer to be able to blend and disable on default
+    // otherwise, sheen would be applied and tinted black
+    bsdf dielectric_sheen_component = df::color_weighted_layer(
+        weight: sheen_color,
+        layer: df::sheen_bsdf(
+            roughness: sheen_roughness * sheen_roughness,
+            tint:  color(1.0),
+            multiscatter_tint: color(1.0),
+            multiscatter: dielectric_component // don't apply thin_film
+        ),
+        base: dielectric_component_with_thin_film);
+
+    // final BSDF is a linear blend between dielectric and metallic component
+    bsdf dielectric_metal_mix = df::weighted_layer(
+        weight: metallic,
+        base: dielectric_sheen_component,
+        layer: metallic_component_with_thin_film,
+        normal: normal);
+
+    bsdf clearcoated = df::custom_curve_layer(
+        weight: clearcoat_blend,
+        normal_reflectivity: 0.04,
+        grazing_reflectivity: grazing_refl_coat,
+        layer: df::microfacet_ggx_vcavities_bsdf(
+            mode: df::scatter_reflect,
+            roughness_u: clearcoat_roughness2,
+            tint: color(1.0)),
+        base: df::weighted_layer(
+            weight: 1.0,
+            layer: dielectric_metal_mix,
+            normal: normal),
+        normal: clearcoat_normal);
+
+} in material(
+    thin_walled: thin_walled,
+    surface: material_surface(
+        scattering: clearcoated,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    volume: material_volume(
+        absorption_coefficient: thin_walled ? color(0.0) : (attenuation_distance == 0) ? color(0.0) : -math::log(attenuation_color) / attenuation_distance
+    ),
+    ior: color(ior),
+    geometry: material_geometry(
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);
+
+
+export material gltf_material_khr_specular_glossiness(
+    // diffuse color
+    uniform color diffuse_factor = color(1.0)
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Factor"),
+        anno::description("The diffuse color of the material. Multiplied to the 'Diffuse Texture' if available.")
+    ]],
+    gltf_texture_lookup_value diffuse_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Diffuse Texture"),
+        anno::description("The diffuse color of the material. Influenced by the 'Diffuse Factor'.")
+    ]],
+
+    // specular glossiness
+    uniform color specular_factor = 1.0
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular Factor"),
+        anno::description("The specular color of the material. Multiplied to the rgb values of the 'Specular/Glossy Texture' if available.")
+    ]],
+    uniform float glossiness_factor = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Glossiness Factor"),
+        anno::description("The glossiness of the material. Select between diffuse (0.0) and nearly specular (1.0). Multiplied to the alpha value of the 'Specular/Glossy Texture' if available.")
+    ]],
+    gltf_texture_lookup_value specular_glossiness_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("PBR Specular Glossiness"),
+        anno::display_name("Specular/Glossy Texture"),
+        anno::description("The specular-glossiness texture. Influenced by the 'Specular Factor' and 'Glossiness Factor'.")
+    ]],
+
+    // normal map
+    gltf_normal_texture_lookup_value normal_texture = gltf_normal_texture_lookup()
+    [[
+        anno::in_group("Normal Mapping"),
+        anno::display_name("Normal Texture"),
+        anno::description("Base layer normal map.")
+    ]],
+
+    // emission
+    uniform color emissive_factor = color(0.0)
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Factor"),
+        anno::description("The emissive color of the material. Multiplied to the 'Emissive Texture' if available.")
+    ]],
+    gltf_texture_lookup_value emissive_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Texture"),
+        anno::description("The emissive map texture. Influenced by the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+    // KHR_materials_emissive_strength
+    uniform float emissive_strength = 1.0
+    [[
+        anno::soft_range(0.0, 10000),
+        anno::in_group("Emission"),
+        anno::display_name("Emissive Strength"),
+        anno::description("The maximum strength of the emissive texture. Multiplied to the 'Emissive Factor'."),
+        anno::enable_if("::math::average(emissive_factor)>0.0")
+    ]],
+
+    // ambient occlusion
+    gltf_texture_lookup_value occlusion_texture = gltf_texture_lookup()
+    [[
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Texture"),
+        anno::description("The occlusion map texture. Influenced by the 'Occlusion Strength'.")
+    ]],
+    uniform float occlusion_strength = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Occlusion"),
+        anno::display_name("Occlusion Strength"),
+        anno::description("A scalar multiplier controlling the amount of occlusion applied. Multiplied to the 'Occlusion Texture'.")
+    ]],
+
+    // alpha
+    uniform gltf_alpha_mode alpha_mode = opaque
+    [[
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Mode"),
+        anno::description("Select how to interpret the alpha value.")
+    ]],
+    uniform float base_alpha = 1.0
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Base Alpha"),
+        anno::description("Select between transparent (0.0) and opaque (1.0). Multiplied to the base color texture alpha channel if available."),
+        anno::enable_if("alpha_mode!=opaque")
+    ]],
+
+    // alpha for gltf_alpha_mode::mask
+    uniform float alpha_cutoff = 0.5
+    [[
+        anno::hard_range(0.0, 1.0),
+        anno::in_group("Opacity"),
+        anno::display_name("Alpha Cutoff"),
+        anno::description("Threshold to decide between fully transparent and fully opaque when alpha mode is 'mask'."),
+        anno::enable_if("alpha_mode==mask")
+    ]],
+
+    uniform string vertex_color_name_spec = string("displayColor")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Color Name"),
+        anno::description("Name of the vertex color primvar usually COLOR_0 'gltf', or displayColor 'usd'.")
+    ]],
+
+    uniform bool use_vertex_color_alpha_spec = false
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Use Opacity Channel From Vertex Color"),
+        anno::description("Multiply the Alpha or .w channel from the vertex color with the base alpha value.")
+    ]],
+
+    uniform string vertex_opacity_name_spec = string("displayOpacity")
+    [[
+        anno::in_group("Primvar"),
+        anno::display_name("Vertex Opacity Name"),
+        anno::description("Name of the vertex color primvar usually the .w component of COLOR_0 'gltf', or displayOpacity 'usd'.")
+    ]]
+
+) [[
+    anno::author("NVIDIA Corporation"),
+    anno::display_name("GLTF Material - Specular-Glossiness"),
+    anno::description("Specular-Glossiness Material that takes the GLTF KHR extension parameters as input.")
+]] = let {
+
+    // handling GLTF parameters
+    // ------------------------------------------------------------------------
+    float4 diffuse_float4 = gltf_prepare_tex_float4(diffuse_texture) * ::scene::data_lookup_float4(vertex_color_name_spec, float4(1.0)); // apply vertex color
+    color diffuse = diffuse_factor * color(diffuse_float4.x, diffuse_float4.y, diffuse_float4.z);
+
+    float alpha = base_alpha * (use_vertex_color_alpha_spec == 1 ? diffuse_float4.w : 1.0)  * ((vertex_color_name_spec != vertex_opacity_name_spec) ? ::scene::data_lookup_float(vertex_opacity_name_spec, float(1.0)) : 1.0);
+    //float alpha = base_alpha;
+    float4 specular_glossiness = gltf_prepare_tex_float4(specular_glossiness_texture);
+    color specular = specular_factor * color(specular_glossiness.x, specular_glossiness.y, specular_glossiness.z);
+    float glossiness = glossiness_factor * specular_glossiness.w;
+
+    float3 normal = gltf_prepare_normal(normal_texture);
+    float occlusion = gltf_prepare_occlusion(occlusion_texture, occlusion_strength);
+    color emissive_color = gltf_perpare_emission(emissive_texture, emissive_factor * math::max(0.0f, emissive_strength));
+
+    // specular glossiness model
+    // ------------------------------------------------------------------------
+
+    //color c_diff = diffuse * (1.0 - math::maxvalue(specular));
+    float F_0 = math::max_value(specular);
+    color F_0_tint = F_0==0.0? color(0.0) : (specular/F_0);
+
+    float a = (1.0 - glossiness) * (1.0 - glossiness);
+
+    // diffuse BRDF
+    bsdf diffuse_brdf = df::diffuse_reflection_bsdf(
+        tint: diffuse * occlusion,
+        roughness: 0.0);
+
+    // specular BRDF
+    bsdf specular_brdf = df::microfacet_ggx_smith_bsdf(
+        tint: color(occlusion),
+        roughness_u: a,
+        roughness_v: a,
+        tangent_u: state::texture_tangent_u(0));
+    bsdf tinted_specular =  df::directional_factor(normal_tint: F_0_tint, grazing_tint: color(1.0), exponent: 5.0, base: specular_brdf);
+    //- Custom curve for specular/diffuse angular mix
+    bsdf diffuse_specular_mix = df::custom_curve_layer(
+        normal_reflectivity: F_0,
+        grazing_reflectivity: 1.0,
+        exponent: 5.0,
+        weight: 1.0,
+        layer: tinted_specular,
+        base: diffuse_brdf,
+        normal: normal);
+
+} in material(
+    surface: material_surface(
+        scattering: diffuse_specular_mix,
+        emission:  material_emission (
+            emission: df::diffuse_edf(),
+            intensity: emissive_color * ::math::PI
+        )
+    ),
+    geometry: material_geometry(
+        normal: normal,
+        cutout_opacity: compute_opacity(alpha_mode, alpha, alpha_cutoff)
+    )
+);

simready_assets/897/.metadata/com.nvidia.simready.conformance.Package-Candidate@1.0.0.json

@@ -0,0 +1,39 @@
+{
+  "format_version": "1.0",
+  "profile": "Package-Candidate",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-14T20:10:29",
+  "assets": [
+    {
+      "asset": "traffic_cone.usd",
+      "features": [
+        {
+          "FET031_PACKAGE_SELF_CONTAINED": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET033_SIMREADY_PACKAGING": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET031_PACKAGE_SELF_CONTAINED": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ],
+  "content_hash": {
+    "sha256": "2f035115efd1ff228d9bb0a8e7fdefd4fd41b85764a070a407bd8e73b55892b8",
+    "blake3": "ea85159b73e901ce040db3726ab6f909ee7cd38c499ea1514cbd0c74b2fc3215"
+  }
+}

simready_assets/897/.metadata/com.nvidia.simready.conformance.Package@1.0.0.json

@@ -0,0 +1,35 @@
+{
+  "format_version": "1.0",
+  "profile": "Package",
+  "profile_version": "1.0.0",
+  "timestamp": "2026-08-14T20:10:29",
+  "assets": [
+    {
+      "asset": "com.nvidia.simready.packaging.json",
+      "features": [
+        {
+          "FET030_PACKAGING_CORE": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": []
+          }
+        },
+        {
+          "FET032_PACKAGING_INTROSPECTION": {
+            "version": "0.1.0",
+            "passed": true,
+            "failing_requirements": [],
+            "dependencies": [
+              {
+                "FET030_PACKAGING_CORE": {
+                  "version": "0.1.0"
+                }
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}