scripts/README.md

# Scripts

Derives both CSV indexes from the assets. Pure Python 3, no dependencies: GLB metadata is read
from each file's glTF JSON chunk and the binary payload is never touched, so probing the whole
23 GB collection takes about ten seconds.

| script | purpose |
|---|---|
| `glb_probe.py` | Library + CLI. Parses one `.glb` and returns rig, animation and geometry stats. |
| `build_dataset.py` | Walks every asset once and writes `../metadata.csv` and `../animations.csv`. `--link` also hardlinks a source directory into `../glb/`. |

```bash
python3 build_dataset.py                      # rebuild both tables in place
python3 build_dataset.py --src /path/raw --link   # ingest a fresh download
python3 glb_probe.py ../glb/<file>.glb        # inspect a single asset
```

## Notes on the probe

- Kinematic-tree roots are counted as joints whose parent is not itself a joint, so
  `num_skeleton_roots > 1` marks a disconnected or multi-tree skeleton.
- Clip duration comes from the `max` of each animation sampler's input accessor, which glTF
  stores in the JSON chunk.
- `animated_joints` intersects a clip's target nodes with the skin's joint set, separating clips
  that drive a rig from clips that only move object-level nodes.