---
license: cc-by-4.0
pretty_name: Atech module SimReady assets
tags:
  - simulation
  - robotics
  - usd
  - simready
  - isaac-sim
  - mujoco
  - urdf
  - 3d
---

# Atech SimReady modules and boards

3-D simulation assets for every module in the [Atech SDK](https://pypi.org/project/atech/)
catalog and for the 8-, 10- and 14-port boards. Each top-level folder is one
SimReady asset package, in three formats:

```
atech_<asset>/
├── com.nvidia.simready.packaging.json         package marker (license, BOM hash)
├── .metadata/                                 root USD list, bill of materials (sha256 per file)
├── simready_usd/<asset>.usd                   USD (crate), following NVIDIA SimReady: Isaac Sim / Omniverse
│   └── .thumbs/256x256/<asset>.usd{,_light,_transparent}.png
├── mjcf/<asset>.xml + mjcf/meshes/<asset>/*.stl    MuJoCo
└── urdf/<asset>.urdf + urdf/meshes/<asset>/*.stl   ROS / Gazebo
```

Asset names are `atech_<module id>` (e.g. `atech_distance_sensor`) and
`atech_board_<board id>` (e.g. `atech_board_14port`).

Generated with `atech sim-assets --all --board 8port,10port,14port --fetch`
(`pip install "atech[sim]"`), then repackaged one folder per asset. The thumbnails
are MuJoCo renders of the MJCF, so they show the CAD's flat material colours, not
the USD's PBR shading or the display's screen texture.

## What is real and what is not

- **Visuals** are Atech's production CAD (module-renders release v1.7), with the
  GLB's own PBR materials. **Colliders are boxes**: the bounds of that CAD.
- **The 8-port board** is Atech's CAD of it ("Node 8 Position Motherboard", from
  Atech's website models), not yet in the module-renders release; its source says so.
- **Derived models.** The PIR, CO₂ (SCD40), robot-arm and stepper modules have no
  model in the CAD release. Theirs are built from the CAD that
  exists plus placeholder parts, and say `derived:` in every format
  (`atech:visual:source` in USD, the MJCF text, the URDF comment). They are not Atech CAD.
  The CO₂ and robot-arm modules follow Atech's product renders; the PIR is drawn as its
  AM312 sensor. The robot-arm module plugs into one port, but its housing is two cells
  long: its `connector` frame is the centre of the -x cell.
- **Masses and inertias are placeholders.** Atech has not published them.
- With real CAD, NVIDIA's SimReady validator reports VG.007 warnings: the CAD
  tessellation has non-manifold vertices.

`atech guide sim` (in the SDK) documents every attribute and the full layout.