hcislab/digital-twin

Room 305 Digital Twin

A USD digital twin of NYCU Room 305 (lighting scene), built by the Human-centered Intelligent System Lab (hcislab) — GitHub @HCIS-Lab. Authored for NVIDIA Isaac Sim 5.1.

Lab links: GitHub @HCIS-Lab · HF @hcislab

Contents

nycu_light_collider.usd    # main scene — open this in Isaac Sim (geometry + colliders + materials + lights)
nycu_lights.usdz           # referenced geometry + textures (center.jpg, Translucent_Glass_Tinted.jpg)

nycu_light_collider.usd references nycu_lights.usdz by a relative path, so the two files must stay side by side. snapshot_download keeps them together automatically.

Scene stats (loaded in Isaac Sim 5.1): 443 meshes (~188k points), 419 materials / 459 shaders, a DomeLight + RectLight. Approx extent 12.1 × 7.0 × 3.4 m.

Usage

from huggingface_hub import snapshot_download

path = snapshot_download(
    repo_id="hcislab/digital-twin",
    repo_type="dataset",
)
# open path/nycu_light_collider.usd in Isaac Sim 5.1

In Isaac Sim (Python):

import omni.usd
omni.usd.get_context().open_stage(f"{path}/nycu_light_collider.usd")

Notes

• Textures are bundled inside nycu_lights.usdz and resolve via relative paths — verified self-contained with UsdUtils.ComputeAllDependencies.
• Two references resolve at runtime in Isaac Sim / Omniverse and are intentionally not bundled:
  • OmniGlass.mdl — Omniverse stock material library.
  • A Cloudy dome-light HDR served from the Omniverse content CDN. Materials and dome lighting need an Omniverse asset connection / cache to display fully; geometry and the RectLight load without it.
• Verified to open cleanly in Isaac Sim 5.1 from a fresh download.

Citation

If you use this digital twin, please cite it:

@misc{hcislab_room305_2026,
  title        = {Room 305 Digital Twin},
  author       = {{Human-centered Intelligent System Lab}},
  year         = {2026},
  howpublished = {Hugging Face dataset},
  url          = {https://huggingface.co/datasets/hcislab/digital-twin},
  note         = {NVIDIA Isaac Sim 5.1 USD digital twin}
}

A machine-readable CITATION.cff is included (Hugging Face renders a "Cite this" entry from it).

License

CC BY-NC 4.0 (Creative Commons Attribution-NonCommercial 4.0).

• ✅ Share and adapt for non-commercial research/education, with attribution (cite as above).
• ❌ No commercial use without separate permission from the lab. For commercial licensing, contact hcislab01@gmail.com.

Note: the referenced OmniGlass.mdl and dome-light HDR are NVIDIA Omniverse assets governed by their own licenses; they are not redistributed here.