---
license: cc-by-4.0
task_categories:
- other
size_categories:
- n<1K
dataset_info:
  features:
  - name: category
    dtype: string
  - name: path
    dtype: string
  - name: scale
    dtype: float64
  - name: rotation
    dtype: float64
  - name: 180-degree symmetry
    dtype: int64
  - name: 90-degree symmetry
    dtype: int64
  - name: round
    dtype: int64
  - name: rotation_red
    dtype: 'null'
  - name: rotation_green
    dtype: 'null'
  - name: mesh_extent_x
    dtype: float64
  - name: mesh_extent_y
    dtype: float64
  - name: mesh_extent_z
    dtype: float64
  - name: mesh_offset_x
    dtype: float64
  - name: mesh_offset_y
    dtype: float64
  - name: mesh_offset_z
    dtype: float64
  splits:
  - name: all
    num_bytes: 19039
    num_examples: 109
  download_size: 13548
  dataset_size: 19039
configs:
- config_name: default
  data_files:
  - split: all
    path: data/all-*
---

# LychSim Objects Dataset

This dataset provides annotations for 3D assets used in **LychSim**, a controllable and interactive simulation framework for vision research. 

For each 3D asset that appears in LychSim scenes, we annotate its semantic category, canonical scale, and pose alignment (the calibration yaw that puts the asset's "front" along +X), together with a precomputed `mesh_offset` so that spawning at `location + mesh_offset` lands the visual bounding box bottom-center exactly on the target location. These annotations are critical for producing semantically aligned ground-truth 3D object poses and for programmatic object placement and scene manipulation.

- **Paper:** [LychSim: A Controllable and Interactive Simulation Framework for Vision Research](https://huggingface.co/papers/2605.12449)
- **Project Page:** [https://lychsim.github.io/](https://lychsim.github.io/)
- **Repository:** [https://github.com/wufeim/LychSim](https://github.com/wufeim/LychSim)

## Sample Usage

You can load this dataset using the Hugging Face `datasets` library:

```python
from datasets import load_dataset

objects = load_dataset("wufeim/lychsim_objects")
```

## License

This dataset is released under the Creative Commons Attribution 4.0 International license (CC BY 4.0).