eval/IDesign/evaluation/batch_render_bpy.py

#!/usr/bin/env python3
"""
批量渲染 IDesign 生成的场景 - 使用 bpy 直接渲染
需要在 blender conda 环境下运行: conda activate blender

高质量渲染设置：与 InternScenes 项目的 blender 渲染器对齐
"""

import bpy
import json
import math
import os
import sys
from pathlib import Path
from datetime import datetime
from mathutils import Vector

try:
    from PIL import Image
    HAS_PIL = True
except ImportError:
    HAS_PIL = False


# ============================================================================
# 渲染参数配置（与 InternScenes 对齐）
# ============================================================================
RENDER_CONFIG = {
    # 分辨率
    "width": 1600,
    "height": 900,
    # 渲染引擎设置
    "engine": "CYCLES",
    "samples": 256,
    "exposure": 0.0,
    # 相机设置
    "camera_lens": 35.0,  # mm
    "camera_clip_start": 0.01,
    "camera_clip_end": 1000.0,
    # 视角模式：diagonal, diagonal2, diagonal3, diagonal4, topdown, side_front, side_back, side_left, side_right
    "view_mode": "diagonal",
    "diagonal_distance": 2.2,  # 增大距离，拉远相机
    "diagonal_height_offset": 0.1,  # 稍微降低视角
    "topdown_height": 1.5,
    "topdown_scale": 1.0,
    # 灯光设置
    "sun_intensity": 3.5,
    "sun_color": (1.0, 0.98, 0.94),  # 暖色调
    "ambient_intensity": 1.0,
    "use_fill_lights": True,
    "fill_intensity": 0.5,
    # 背景设置
    "background": (1.0, 1.0, 1.0, 1.0),
    "use_transparent_background": True,
    # 后处理
    "auto_crop": True,
    "crop_padding": 10,
}

# 清除默认 Cube
def clear_default_cube():
    obj = bpy.data.objects.get('Cube')
    if obj:
        bpy.data.objects.remove(obj, do_unlink=True)

def clear_scene():
    """完全清空场景"""
    bpy.ops.object.select_all(action='SELECT')
    bpy.ops.object.delete()
    
    # 清除所有 mesh 数据
    for mesh in bpy.data.meshes:
        bpy.data.meshes.remove(mesh)
    for material in bpy.data.materials:
        bpy.data.materials.remove(material)

def import_glb(file_path, object_name):
    """导入 GLB 文件"""
    try:
        bpy.ops.import_scene.gltf(filepath=file_path)
        imported_object = bpy.context.view_layer.objects.active
        if imported_object is not None:
            imported_object.name = object_name
        return imported_object
    except Exception as e:
        print(f"导入失败 {object_name}: {e}")
        return None

def find_glb_files(directories):
    """在多个目录中查找 GLB 文件"""
    glb_files = {}
    for directory in directories:
        if not os.path.exists(directory):
            continue
        for root, dirs, files in os.walk(directory):
            for file in files:
                if file.endswith(".glb"):
                    key = file.replace(".glb", "")
                    if key not in glb_files:
                        glb_files[key] = os.path.join(root, file)
    return glb_files

def get_highest_parent_objects():
    """获取最高层父对象"""
    return [obj for obj in bpy.data.objects if obj.parent is None]

def select_meshes_under_empty(empty_object_name):
    """递归选择 Empty 下的所有 Mesh"""
    empty_object = bpy.data.objects.get(empty_object_name)
    if empty_object is not None and empty_object.type == 'EMPTY':
        for child in empty_object.children:
            if child.type == 'MESH':
                child.select_set(True)
                bpy.context.view_layer.objects.active = child
            else:
                select_meshes_under_empty(child.name)

def delete_empty_objects():
    """删除所有 Empty 对象"""
    empties = [obj for obj in bpy.context.scene.objects if obj.type == 'EMPTY']
    for obj in empties:
        bpy.data.objects.remove(obj)

def rescale_object(obj, scale):
    """缩放对象到指定尺寸"""
    if obj.type == 'MESH':
        bbox_dimensions = obj.dimensions
        if bbox_dimensions.x > 0 and bbox_dimensions.y > 0 and bbox_dimensions.z > 0:
            scale_factors = (
                scale.get("length", 1) / bbox_dimensions.x,
                scale.get("width", 1) / bbox_dimensions.y,
                scale.get("height", 1) / bbox_dimensions.z
            )
            obj.scale = scale_factors


def ensure_principled_materials(objects):
    """确保所有网格对象有正确的 Principled BSDF 材质（与 InternScenes 渲染器对齐）
    
    增强现有材质的 PBR 参数以获得更好的渲染效果。
    """
    for obj in objects:
        if obj.type != "MESH" or not obj.data.materials:
            continue
        
        for mat_idx, material in enumerate(obj.data.materials):
            if material is None:
                continue
            
            # 跳过地板材质
            if material.name == "FloorMaterial":
                continue
            
            # 启用节点
            material.use_nodes = True
            nodes = material.node_tree.nodes
            
            # 查找或创建 Principled BSDF
            principled = None
            for node in nodes:
                if node.type == "BSDF_PRINCIPLED":
                    principled = node
                    break
            
            if principled is None:
                # 如果没有 Principled BSDF，创建新的着色器设置
                nodes.clear()
                principled = nodes.new(type="ShaderNodeBsdfPrincipled")
                output = nodes.new(type="ShaderNodeOutputMaterial")
                material.node_tree.links.new(principled.outputs["BSDF"], output.inputs["Surface"])
            
            # 增强 PBR 参数
            if "Base Color" in principled.inputs:
                bc = principled.inputs["Base Color"].default_value
                if bc[0] == 0 and bc[1] == 0 and bc[2] == 0:
                    principled.inputs["Base Color"].default_value = (0.8, 0.8, 0.8, 1.0)
            
            if "Roughness" in principled.inputs:
                current_rough = principled.inputs["Roughness"].default_value
                if current_rough < 0.1 or current_rough > 0.99:
                    principled.inputs["Roughness"].default_value = 0.5
            
            if "Metallic" in principled.inputs:
                principled.inputs["Metallic"].default_value = 0.0


def create_room(width, depth, height):
    """创建地板（纯白色材质）"""
    # 只创建地板
    bpy.ops.mesh.primitive_plane_add(size=1, location=(width/2, depth/2, 0))
    floor = bpy.context.active_object
    floor.scale = (width, depth, 1)
    floor.name = "Floor"
    
    # 地板材质：纯白色 Principled BSDF
    mat = bpy.data.materials.new(name="FloorMaterial")
    mat.use_nodes = True
    nodes = mat.node_tree.nodes
    links = mat.node_tree.links
    nodes.clear()
    
    # 创建 Principled BSDF 节点
    bsdf = nodes.new(type="ShaderNodeBsdfPrincipled")
    bsdf.inputs["Base Color"].default_value = (1.0, 1.0, 1.0, 1.0)  # 纯白色
    bsdf.inputs["Roughness"].default_value = 0.35
    bsdf.inputs["Metallic"].default_value = 0.0
    
    # 创建输出节点
    output = nodes.new(type="ShaderNodeOutputMaterial")
    links.new(bsdf.outputs["BSDF"], output.inputs["Surface"])
    
    # 材质设置
    mat.blend_method = "OPAQUE"
    if hasattr(mat, 'shadow_method'):
        mat.shadow_method = "OPAQUE"
    mat.use_backface_culling = False  # 双面渲染
    
    floor.data.materials.append(mat)
    return floor

def setup_camera(width, depth, height, view_mode="diagonal"):
    """设置相机（与 InternScenes 渲染器对齐）
    
    Args:
        width, depth, height: 房间尺寸
        view_mode: 相机视角模式
            - diagonal: 前右角对角线视角
            - diagonal2: 后左角对角线视角  
            - diagonal3: 后右角对角线视角
            - diagonal4: 前左角对角线视角
            - topdown: 俯视图（正交）
            - side_front/side_back/side_left/side_right: 侧视图
    """
    # 计算场景边界
    center = Vector((width/2, depth/2, height/2))
    extent = Vector((width, depth, height))
    radius = extent.length / 2
    
    bpy.ops.object.camera_add()
    camera = bpy.context.active_object
    camera.name = "Camera"
    
    config = RENDER_CONFIG
    diagonal_distance = config.get("diagonal_distance", 1.2)
    diagonal_height_offset = config.get("diagonal_height_offset", 0.15)
    topdown_height = config.get("topdown_height", 1.5)
    topdown_scale = config.get("topdown_scale", 1.0)
    
    if view_mode == "topdown":
        # 正交俯视图
        camera.data.type = "ORTHO"
        camera.data.ortho_scale = radius * topdown_scale
        eye = center + Vector((0.0, 0.0, radius * topdown_height))
        camera.location = eye
        camera.data.lens = 50.0
        # 朝下看
        _look_at(camera, center)
    elif view_mode.startswith("side_"):
        # 侧视图（带仰角）
        camera.data.type = "PERSP"
        camera.data.lens = config.get("camera_lens", 35.0)
        
        elev_rad = math.radians(30.0)  # 30度仰角
        horizontal_dist = math.cos(elev_rad)
        vertical_dist = math.sin(elev_rad)
        
        if view_mode == "side_front":
            horiz_dir = Vector((0.0, 1.0, 0.0))
        elif view_mode == "side_back":
            horiz_dir = Vector((0.0, -1.0, 0.0))
        elif view_mode == "side_left":
            horiz_dir = Vector((-1.0, 0.0, 0.0))
        elif view_mode == "side_right":
            horiz_dir = Vector((1.0, 0.0, 0.0))
        else:
            horiz_dir = Vector((0.0, 1.0, 0.0))
        
        distance = radius * max(1.0, diagonal_distance * 1.5)
        direction = Vector((
            horiz_dir.x * horizontal_dist,
            horiz_dir.y * horizontal_dist,
            vertical_dist
        ))
        direction.normalize()
        
        eye = center + direction * distance
        camera.location = eye
        _look_at(camera, center)
    else:
        # 对角线透视视角（diagonal, diagonal2, diagonal3, diagonal4）
        camera.data.type = "PERSP"
        camera.data.lens = config.get("camera_lens", 35.0)
        
        if view_mode == "diagonal":
            diag_direction = Vector((1.0, 1.0, 1.0))  # 前右角
        elif view_mode == "diagonal2":
            diag_direction = Vector((-1.0, -1.0, 1.0))  # 后左角
        elif view_mode == "diagonal3":
            diag_direction = Vector((1.0, -1.0, 1.0))  # 后右角
        elif view_mode == "diagonal4":
            diag_direction = Vector((-1.0, 1.0, 1.0))  # 前左角
        else:
            diag_direction = Vector((1.0, 1.0, 1.0))
        diag_direction.normalize()
        
        distance = radius * max(1.0, diagonal_distance * 1.5)
        eye = center + diag_direction * distance
        
        look_target = center.copy()
        z_offset = radius * diagonal_height_offset
        eye.z -= z_offset
        look_target.z -= z_offset
        
        camera.location = eye
        _look_at(camera, look_target)
    
    # 相机参数
    camera.data.clip_start = config.get("camera_clip_start", 0.01)
    camera.data.clip_end = config.get("camera_clip_end", radius * 100.0)
    
    bpy.context.scene.camera = camera
    return camera


def _look_at(camera, target):
    """让相机朝向目标点"""
    direction = target - camera.location
    if direction.length < 1e-6:
        direction = Vector((0.0, 0.0, -1.0))
    else:
        direction.normalize()
    quat = direction.to_track_quat("-Z", "Y")
    camera.rotation_euler = quat.to_euler()

def setup_lighting(width, depth, height):
    """设置灯光（与 InternScenes 渲染器对齐）"""
    center = Vector((width/2, depth/2, height/2))
    extent = Vector((width, depth, height))
    radius = extent.length / 2
    
    config = RENDER_CONFIG
    sun_intensity = config.get("sun_intensity", 3.5)
    sun_color = config.get("sun_color", (1.0, 0.98, 0.94))
    use_fill_lights = config.get("use_fill_lights", True)
    fill_intensity = config.get("fill_intensity", 0.5)
    
    # ========== 主光源：太阳光 ==========
    sun_light_data = bpy.data.lights.new("Sun", type="SUN")
    sun = bpy.data.objects.new("Sun", sun_light_data)
    bpy.context.collection.objects.link(sun)
    
    # 太阳光位置和方向：从相机方向偏移
    camera = bpy.context.scene.camera
    if camera:
        view_dir = center - camera.location
        if view_dir.length < 1e-6:
            view_dir = Vector((0.0, 0.0, -1.0))
        else:
            view_dir.normalize()
        sun_dir = view_dir * 0.6 + Vector((0.0, 0.0, -0.8))
        if sun_dir.length < 1e-6:
            sun_dir = Vector((0.0, 0.0, -1.0))
        else:
            sun_dir.normalize()
    else:
        sun_dir = Vector((-0.5, -0.5, -0.8))
        sun_dir.normalize()
    
    sun.location = center + sun_dir * radius * 2.0
    quat = sun_dir.to_track_quat("-Z", "Y")
    sun.rotation_euler = quat.to_euler()
    
    sun.data.energy = max(0.01, sun_intensity)
    sun.data.color = sun_color
    
    # 太阳光柔和阴影
    if hasattr(sun.data, "angle"):
        sun.data.angle = math.radians(1.0)
    
    if not use_fill_lights:
        return
    
    # ========== 填充光：Area Light ==========
    fill_light_data = bpy.data.lights.new("FillLight", type="AREA")
    fill_light = bpy.data.objects.new("FillLight", fill_light_data)
    bpy.context.collection.objects.link(fill_light)
    
    fill_light.location = center + Vector((0.0, -radius * 0.5, radius * 1.5))
    fill_light.rotation_euler = (math.radians(45), 0, 0)
    fill_light_data.energy = fill_intensity * 100
    fill_light_data.color = (1.0, 0.98, 0.95)  # 微暖色
    fill_light_data.size = radius * 2
    
    # ========== 轮廓光：Rim Light ==========
    rim_light_data = bpy.data.lights.new("RimLight", type="AREA")
    rim_light = bpy.data.objects.new("RimLight", rim_light_data)
    bpy.context.collection.objects.link(rim_light)
    
    rim_light.location = center + Vector((radius * 0.5, radius, radius))
    rim_light.rotation_euler = (math.radians(-45), math.radians(30), 0)
    rim_light_data.energy = fill_intensity * 50
    rim_light_data.color = (0.95, 0.97, 1.0)  # 微冷色形成对比
    rim_light_data.size = radius


def setup_world():
    """设置世界/环境（与 InternScenes 渲染器对齐）"""
    scene = bpy.context.scene
    config = RENDER_CONFIG
    background = config.get("background", (1.0, 1.0, 1.0, 1.0))
    ambient_intensity = config.get("ambient_intensity", 1.0)
    use_transparent = config.get("use_transparent_background", True)
    
    # 创建或获取世界
    if scene.world is None:
        scene.world = bpy.data.worlds.new("World")
    world = scene.world
    world.use_nodes = True
    nodes = world.node_tree.nodes
    links = world.node_tree.links
    
    # 清除现有节点
    nodes.clear()
    
    # 创建输出节点
    output_node = nodes.new(type="ShaderNodeOutputWorld")
    output_node.location = (400, 0)
    
    # 简单纯色背景
    background_node = nodes.new(type="ShaderNodeBackground")
    background_node.location = (200, 0)
    background_node.inputs[0].default_value = (
        background[0],
        background[1],
        background[2],
        background[3] if len(background) > 3 else 1.0,
    )
    background_node.inputs[1].default_value = max(0.0, ambient_intensity)
    links.new(background_node.outputs["Background"], output_node.inputs["Surface"])
    
    # 透明背景设置
    scene.render.film_transparent = use_transparent
    scene.render.image_settings.color_mode = "RGBA"

def render_single_scene(scene_dir, output_name="render.png"):
    """渲染单个场景"""
    scene_dir = Path(scene_dir)
    
    # 找场景文件 - 支持 scene_graph.json 或 scene.json
    scene_json = None
    for json_name in ["scene_graph.json", "scene.json"]:
        candidate = scene_dir / json_name
        if candidate.exists():
            scene_json = candidate
            break
    
    if scene_json is None:
        print(f"  ⚠️ scene_graph.json/scene.json 不存在，跳过")
        return False
    
    # 读取场景数据
    with open(scene_json, 'r') as f:
        data = json.load(f)
    
    # 提取物体信息
    objects_in_room = {}
    room_dims = [4, 4, 2.8]  # 默认
    
    for item in data:
        obj_id = item.get("new_object_id", "")
        if obj_id == "middle of the room":
            size = item.get("size_in_meters", {})
            room_dims = [size.get("length", 4), size.get("width", 4), 2.8]
        elif obj_id == "ceiling":
            pos = item.get("position", {})
            room_dims[2] = pos.get("z", 2.8)
        elif obj_id not in ["south_wall", "north_wall", "east_wall", "west_wall"]:
            if item.get("position"):  # 只处理有位置的物体
                objects_in_room[obj_id] = item
    
    if not objects_in_room:
        print(f"  ⚠️ 无有效物体，跳过")
        return False
    
    # 查找 GLB 文件
    glb_dirs = [
        scene_dir / "Assets",
        scene_dir / "assets", 
        scene_dir / "glb",
        scene_dir / "objects"
    ]
    glb_file_paths = find_glb_files([str(d) for d in glb_dirs])
    
    if not glb_file_paths:
        print(f"  ⚠️ 无 GLB 文件，跳过")
        return False
    
    # 清空场景
    clear_scene()
    
    # 导入物体
    for item_id in objects_in_room:
        if item_id in glb_file_paths:
            import_glb(glb_file_paths[item_id], item_id)
    
    # 处理导入的物体：合并 Empty 下的 Mesh
    parents = get_highest_parent_objects()
    empty_parents = [p for p in parents if p.type == "EMPTY"]
    
    for empty_parent in empty_parents:
        bpy.ops.object.select_all(action='DESELECT')
        select_meshes_under_empty(empty_parent.name)
        
        if bpy.context.selected_objects:
            bpy.ops.object.join()
            bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY', center='BOUNDS')
            
            joined_object = bpy.context.view_layer.objects.active
            if joined_object:
                joined_object.name = empty_parent.name + "-joined"
    
    # 清除父子关系，重置变换
    MSH_OBJS = [m for m in bpy.context.scene.objects if m.type == 'MESH']
    for obj in MSH_OBJS:
        bpy.context.view_layer.objects.active = obj
        bpy.ops.object.parent_clear(type='CLEAR_KEEP_TRANSFORM')
        obj.location = (0.0, 0.0, 0.0)
        obj.select_set(True)
        bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)
        bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY', center='BOUNDS')
    
    # 设置物体位置和旋转
    loaded_count = 0
    MSH_OBJS = [m for m in bpy.context.scene.objects if m.type == 'MESH']
    for obj in MSH_OBJS:
        # 匹配物体名
        key_variants = [
            obj.name,
            obj.name.replace("-joined", ""),
            obj.name.replace(".001", ""),
            obj.name.replace(".002", ""),
        ]
        key = next((k for k in key_variants if k in objects_in_room), None)
        if key is None:
            continue
        
        item = objects_in_room[key]
        pos = item.get("position", {})
        rot = item.get("rotation", {})
        size = item.get("size_in_meters", {})
        
        # 设置位置
        obj.location = (pos.get("x", 0), pos.get("y", 0), pos.get("z", 0))
        
        # 设置旋转 (z_angle 度数转弧度，加 180 度)
        z_angle = rot.get("z_angle", 0)
        bpy.ops.object.select_all(action='DESELECT')
        obj.select_set(True)
        bpy.ops.transform.rotate(value=(z_angle / 180.0) * math.pi + math.pi, orient_axis='Z')
        
        # 缩放
        if size:
            rescale_object(obj, size)
        
        loaded_count += 1
    
    # 删除 Empty
    delete_empty_objects()
    
    # 增强所有网格对象的材质
    mesh_objects = [m for m in bpy.context.scene.objects if m.type == 'MESH']
    ensure_principled_materials(mesh_objects)
    
    # 创建房间
    create_room(room_dims[0], room_dims[1], room_dims[2])
    
    # 设置世界/环境
    setup_world()
    
    # 设置相机和灯光
    view_mode = RENDER_CONFIG.get("view_mode", "diagonal")
    setup_camera(room_dims[0], room_dims[1], room_dims[2], view_mode)
    setup_lighting(room_dims[0], room_dims[1], room_dims[2])
    
    # 配置渲染设置（与 InternScenes 渲染器对齐）
    configure_render_settings()
    
    # 渲染
    output_path = scene_dir / output_name
    scene = bpy.context.scene
    scene.render.filepath = str(output_path)
    bpy.ops.render.render(write_still=True)
    
    # 自动裁剪透明边距
    if RENDER_CONFIG.get("auto_crop", True) and HAS_PIL:
        auto_crop_image(str(output_path), RENDER_CONFIG.get("crop_padding", 10))
    
    print(f"  ✅ 渲染完成 ({loaded_count} 个物体): {output_path}")
    return True


def configure_render_settings():
    """配置渲染设置（与 InternScenes 渲染器对齐）"""
    scene = bpy.context.scene
    render = scene.render
    config = RENDER_CONFIG
    
    engine = config.get("engine", "CYCLES")
    width = config.get("width", 1600)
    height = config.get("height", 900)
    samples = config.get("samples", 256)
    exposure = config.get("exposure", 0.0)
    
    # 检查可用引擎
    available_engines = {item.identifier for item in render.bl_rna.properties["engine"].enum_items}
    target_engine = engine
    if target_engine not in available_engines:
        if target_engine == "BLENDER_EEVEE" and "BLENDER_EEVEE_NEXT" in available_engines:
            target_engine = "BLENDER_EEVEE_NEXT"
        elif "CYCLES" in available_engines:
            target_engine = "CYCLES"
    
    render.engine = target_engine
    render.resolution_x = width
    render.resolution_y = height
    render.image_settings.file_format = "PNG"
    render.image_settings.color_mode = "RGBA"
    render.film_transparent = config.get("use_transparent_background", True)
    render.use_persistent_data = False
    
    scene.view_settings.exposure = exposure
    
    if target_engine == "CYCLES":
        scene.cycles.samples = max(1, samples)
        scene.cycles.preview_samples = min(scene.cycles.samples, 64)
        scene.cycles.use_denoising = True
        scene.cycles.use_adaptive_sampling = True
        scene.cycles.max_bounces = 12
        scene.cycles.diffuse_bounces = 4
        scene.cycles.glossy_bounces = 4
        scene.cycles.transmission_bounces = 8
        scene.cycles.volume_bounces = 2
        
        # 尝试使用 GPU
        try:
            prefs = bpy.context.preferences.addons['cycles'].preferences
            prefs.compute_device_type = 'CUDA'
            prefs.get_devices()
            scene.cycles.device = 'GPU'
            for device in prefs.devices:
                device.use = True
        except:
            pass
    elif target_engine in {"BLENDER_EEVEE", "BLENDER_EEVEE_NEXT"}:
        eevee = scene.eevee
        if hasattr(eevee, "taa_render_samples"):
            eevee.taa_render_samples = max(1, samples)
        elif hasattr(eevee, "samples"):
            eevee.samples = max(1, samples)
        # AO
        if hasattr(eevee, "use_gtao"):
            eevee.use_gtao = True
            if hasattr(eevee, "gtao_distance"):
                eevee.gtao_distance = 0.5
            if hasattr(eevee, "gtao_quality"):
                eevee.gtao_quality = 0.5
        # Bloom
        if hasattr(eevee, "use_bloom"):
            eevee.use_bloom = True
            if hasattr(eevee, "bloom_threshold"):
                eevee.bloom_threshold = 0.8
            if hasattr(eevee, "bloom_intensity"):
                eevee.bloom_intensity = 0.1
        # SSR
        if hasattr(eevee, "use_ssr"):
            eevee.use_ssr = True
            if hasattr(eevee, "use_ssr_refraction"):
                eevee.use_ssr_refraction = True
        # 软阴影
        if hasattr(eevee, "use_soft_shadows"):
            eevee.use_soft_shadows = True
        if hasattr(eevee, "shadow_cube_size"):
            eevee.shadow_cube_size = '1024'
        if hasattr(eevee, "shadow_cascade_size"):
            eevee.shadow_cascade_size = '2048'
        if hasattr(eevee, "use_denoise"):
            eevee.use_denoise = True


def auto_crop_image(image_path, padding=10):
    """裁剪图像透明边距
    
    Args:
        image_path: PNG 图像路径
        padding: 保留的边距像素
    """
    img = Image.open(image_path)
    
    if img.mode != "RGBA":
        img = img.convert("RGBA")
    
    # 获取 alpha 通道并找到非透明边界
    alpha = img.split()[-1]
    bbox = alpha.getbbox()
    
    if bbox is None:
        return
    
    # 添加边距
    left = max(0, bbox[0] - padding)
    top = max(0, bbox[1] - padding)
    right = min(img.width, bbox[2] + padding)
    bottom = min(img.height, bbox[3] + padding)
    
    # 裁剪并保存
    cropped = img.crop((left, top, right, bottom))
    cropped.save(image_path)


def batch_render(results_dir, dataset_name=""):
    """批量渲染"""
    results_dir = Path(results_dir)
    if not results_dir.exists():
        print(f"⚠️ 目录不存在: {results_dir}")
        return 0
    
    # 找所有有 scene_graph.json 或 scene.json 的目录
    scene_dirs = [d for d in results_dir.iterdir() 
                  if d.is_dir() and ((d / "scene_graph.json").exists() or (d / "scene.json").exists())]
    
    print(f"\n📂 {dataset_name}: 找到 {len(scene_dirs)} 个场景")
    
    success = 0
    for i, scene_dir in enumerate(scene_dirs, 1):
        # 跳过已渲染的
        if (scene_dir / "render.png").exists():
            print(f"[{i}/{len(scene_dirs)}] {scene_dir.name} - 已存在，跳过")
            success += 1
            success += 1
            continue
        
        print(f"[{i}/{len(scene_dirs)}] {scene_dir.name}")
        if render_single_scene(scene_dir):
            success += 1
    
    print(f"\n✅ {dataset_name} 完成: {success}/{len(scene_dirs)}")
    return success


def main():
    print(f"\n{'='*60}")
    print("🎬 IDesign 批量渲染 (bpy)")
    print(f"{'='*60}")
    print(f"时间: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}")
    
    # 删除默认 Cube
    clear_default_cube()
    
    # 渲染 zones
    zones_dir = "/home/v-meiszhang/amlt-project/MetaSpatial/IDesign/evaluation/evaluation_results"
    batch_render(zones_dir, "zones")
    
    # 渲染 bench
    bench_dir = "/home/v-meiszhang/amlt-project/MetaSpatial/IDesign/evaluation/layout_bench_results"
    batch_render(bench_dir, "bench")
    
    print(f"\n{'='*60}")
    print("✅ 全部完成")
    print(f"{'='*60}")


if __name__ == "__main__":
    main()