README.md

---
license: mit
pretty_name: GraspTwin
task_categories:
  - robotics
tags:
  - grasping
  - manipulation
  - language-conditioned
  - 3d
  - meshes
  - digital-twin
size_categories:
  - n<1K
---

# GraspTwin benchmark scenes

Digital twins of real tabletop scenes for language-conditioned grasping: one
reconstructed `.glb` mesh per object, the object poses needed to rebuild each scene in
simulation, and the natural-language tasks with their target objects.

- 9 scenes, 5 subscenes each (45 subscenes total)
- 8 household objects per subscene (`scene_8_4` has 10)
- 10 natural-language tasks per scene, each tied to a target object
- about 2.6 GB of meshes

## Layout

```
scene_N/
  tasks.json                     # 10 task strings, e.g. "grab the mug by the handle"
  scene_N_M/                     # subscene M = 1..5 (same objects, different arrangement)
    objects.json                 # names of the objects in the subscene
    target_objects.json          # target object per task, index-aligned with ../tasks.json
    boxes.json                   # 2D box [x1, y1, x2, y2] in pixels of the 1920x1080
                                 #   scene capture, per object name
    meshes/
      <object name>.glb          # one mesh per object (trimesh export)
      transforms.json            # per-object translation, rotation_wxyz, scale
      settle_transforms.json     # same, after the objects settle under physics in sim
```

Object names are the keys used across `objects.json`, `boxes.json`, `transforms.json`
and the mesh filenames, so a task can be resolved to its mesh by name.

## Loading a subscene

```python
import json, trimesh
from pathlib import Path

sub = Path("scene_1/scene_1_1")
tasks = json.loads((sub.parent / "tasks.json").read_text())
targets = json.loads((sub / "target_objects.json").read_text())
poses = json.loads((sub / "meshes" / "transforms.json").read_text())["objects"]

for task, obj in zip(tasks, targets):
    mesh = trimesh.load(sub / "meshes" / f"{obj}.glb")
    print(task, "->", obj, poses[obj]["translation"])
```

## License

MIT.