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README.md

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-license: apache-2.0
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+# structure_data — unified-schema 3D reconstruction datasets
+
+Three datasets for image-to-3D structure prediction (SFT data for Qwen3-VL-4B-Instruct):
+
+- **v11canon** — single Infinigen objects (chairs, tables, cabinets, etc.)
+- **scene_v3** — multi-object Infinigen scenes
+- **physx_v11canon** — PartNet-Mobility articulated objects, rotated to v11 chirality
+
+## Layout
+
+```
+v11canon/
+  train.jsonl           # 7045 rows
+  test_seen.jsonl       # 393 rows  (held-out objects in seen categories)
+  test_unseen.jsonl     # 390 rows  (objects in unseen categories)
+  images/               # *.png referenced by jsonls
+scene_v3/
+  train.jsonl
+  test.jsonl
+  images/
+physx_v11canon/
+  train.jsonl           # 1818 rows
+  test.jsonl            # 202 rows
+  images/
+```
+
+## JSONL format
+
+Each row:
+```json
+{
+  "image": ["v11canon/images/foo_canonical_view.png",
+            "v11canon/images/foo_canonical_seg.png",
+            "v11canon/images/foo_view9.png"],
+  "conversations": [
+    {"from": "human", "value": "<prompt with <image> tokens>"},
+    {"from": "gpt",   "value": "<compact JSON: materials + nodes + relations>"}
+  ]
+}
+```
+
+GT JSON top-level fields:
+- `materials`: dict of `{family, desc}` keyed by integer index. `family` is a closed
+  vocab: Wood|Metal|Plastic|Glass|Fabric|Leather|Ceramic|Stone|Rubber|Other.
+  Materials are deduplicated by `(family, desc)`.
+- `nodes`: dict keyed by integer index (string). Each entry has `parent` (int or null),
+  `material` (int as string, key into `materials`), `centroid`, `extents`, and
+  optional `joint` `{type ∈ {hinge, slide}, axis, position, range}`.
+- `relations`: list of `{type ∈ {symmetric, instance}, a, b, plane?}`.
+
+## Conventions
+
+- Image 1: rendered view of the object/scene with full materials.
+- Image 2: segmentation map at the SAME camera as Image 1.
+- Images 3..N: extra views with possible articulation (no seg map).
+- Coordinates: unit-cube-normalized (max extent = 1.0). Y-up, +X-front.
+- PhysX OBJs are pre-rotated 90° around Y so +Z-front becomes +X-front.