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**MuJoCo** stands for **Mu**lti-**Jo**int dynamics with **Co**ntact. It is a
general purpose physics engine that aims to facilitate research and development
in robotics, biomechanics, graphics and animation, machine learning, and other
areas which demand fast and accurate simulation of articulated structures
interacting with their environment.
This repository is maintained by [Google DeepMind](https://www.deepmind.com/).
MuJoCo has a C API and is intended for researchers and developers. The runtime
simulation module is tuned to maximize performance and operates on low-level
data structures that are preallocated by the built-in XML compiler. The library
includes interactive visualization with a native GUI, rendered in OpenGL. MuJoCo
further exposes a large number of utility functions for computing
physics-related quantities.
We also provide [Python bindings] and a plug-in for the [Unity] game engine.
## Documentation
MuJoCo's documentation can be found at [mujoco.readthedocs.io]. Upcoming
features due for the next release can be found in the [changelog] in the
"latest" branch.
## Getting Started
There are two easy ways to get started with MuJoCo:
1. **Run `simulate` on your machine.**
[This video](https://www.youtube.com/watch?v=P83tKA1iz2Y) shows a screen capture
of `simulate`, MuJoCo's native interactive viewer. Follow the steps described in
the [Getting Started] section of the documentation to get `simulate` running on
your machine.
2. **Explore our online IPython notebooks.**
If you are a Python user, you might want to start with our tutorial notebooks
running on Google Colab:
- The **introductory** tutorial teaches MuJoCo basics:
[](https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/python/tutorial.ipynb)
- The **Model Editing** tutorial shows how to create and edit models procedurally:
[](https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/python/mjspec.ipynb)
- The **rollout** tutorial shows how to use the multithreaded `rollout` module:
[](https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/python/rollout.ipynb)
- The **LQR** tutorial synthesizes a linear-quadratic controller, balancing a
humanoid on one leg:
[](https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/python/LQR.ipynb)
- The **least-squares** tutorial explains how to use the Python-based nonlinear
least-squares solver:
[](https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/python/least_squares.ipynb)
- The **MJX** tutorial provides usage examples of
[MuJoCo XLA](https://mujoco.readthedocs.io/en/stable/mjx.html), a branch of MuJoCo written in JAX:
[](https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/mjx/tutorial.ipynb)
- The **differentiable physics** tutorial trains locomotion policies with
analytical gradients automatically derived from MuJoCo's physics step:
[](https://colab.research.google.com/github/google-deepmind/mujoco/blob/main/mjx/training_apg.ipynb)
## Installation
### Prebuilt binaries
Versioned releases are available as precompiled binaries from the GitHub
[releases page], built for Linux (x86-64 and AArch64), Windows (x86-64 only),
and macOS (universal). This is the recommended way to use the software.
### Building from source
Users who wish to build MuJoCo from source should consult the [build from
source] section of the documentation. However, note that the commit at
the tip of the `main` branch may be unstable.
### Python (>= 3.11)
The native Python bindings, which come pre-packaged with a copy of MuJoCo, can
be installed from [PyPI] via:
```bash
pip install mujoco
```
Note that Pre-built Linux wheels target `manylinux2014`, see
[here](https://github.com/pypa/manylinux) for compatible distributions. For more
information such as building the bindings from source, see the [Python bindings]
section of the documentation.
## Versioning
We aim to release MuJoCo in the first week of each month. Our versioning
standards changed to modified Semantic Versioning in 3.5.0,
see [versioning](VERSIONING.md) for details.
## Contributing
We welcome community engagement: questions, requests for help, bug reports and
feature requests. To read more about bug reports, feature requests and more
ambitious contributions, please see our [contributors guide](CONTRIBUTING.md)
and [style guide](STYLEGUIDE.md).
## Asking Questions
Questions and requests for help are welcome as a GitHub
["Asking for Help" Discussion](https://github.com/google-deepmind/mujoco/discussions/categories/asking-for-help)
and should focus on a specific problem or question.
## Bug reports and feature requests
GitHub [Issues](https://github.com/google-deepmind/mujoco/issues) are reserved
for bug reports, feature requests and other development-related subjects.
## Related software
MuJoCo is the backbone for numerous environment packages. Below we list several
bindings and converters.
### Bindings
These packages give users of various languages access to MuJoCo functionality:
#### First-party bindings:
- [Python bindings](https://mujoco.readthedocs.io/en/stable/python.html)
- [dm_control](https://github.com/google-deepmind/dm_control), Google
DeepMind's related environment stack, includes
[PyMJCF](https://github.com/google-deepmind/dm_control/blob/main/dm_control/mjcf/README.md),
a module for procedural manipulation of MuJoCo models.
- [JavaScript bindings and WebAssembly support](/wasm/README.md) (inspired [stillonearth](https://github.com/stillonearth) and [zalo](https://github.com/zalo)'s community projects; [mjswan](https://github.com/ttktjmt/mjswan) extends these with real-time policy control, interactive force
application, and more).
- [C# bindings and Unity plug-in](https://mujoco.readthedocs.io/en/stable/unity.html)
#### Third-party bindings:
- **MATLAB Simulink**: [Simulink Blockset for MuJoCo Simulator](https://github.com/mathworks-robotics/mujoco-simulink-blockset)
by [Manoj Velmurugan](https://github.com/vmanoj1996).
- **Swift**: [swift-mujoco](https://github.com/liuliu/swift-mujoco)
- **Java**: [mujoco-java](https://github.com/CommonWealthRobotics/mujoco-java)
- **Julia**: [MuJoCo.jl](https://github.com/JamieMair/MuJoCo.jl)
- **Rust**: [MuJoCo-rs](https://github.com/davidhozic/mujoco-rs)
### Converters
- **OpenSim**: [MyoConverter](https://github.com/MyoHub/myoconverter) converts
OpenSim models to MJCF.
- **SDFormat**: [gz-mujoco](https://github.com/gazebosim/gz-mujoco/) is a
two-way SDFormat <-> MJCF conversion tool.
- **OBJ**: [obj2mjcf](https://github.com/kevinzakka/obj2mjcf)
a script for converting composite OBJ files into a loadable MJCF model.
- **onshape**: [Onshape to Robot](https://github.com/rhoban/onshape-to-robot)
Converts [onshape](https://www.onshape.com/en/) CAD assemblies to MJCF.
## Citation
If you use MuJoCo for published research, please cite:
```
@inproceedings{todorov2012mujoco,
title={MuJoCo: A physics engine for model-based control},
author={Todorov, Emanuel and Erez, Tom and Tassa, Yuval},
booktitle={2012 IEEE/RSJ International Conference on Intelligent Robots and Systems},
pages={5026--5033},
year={2012},
organization={IEEE},
doi={10.1109/IROS.2012.6386109}
}
```
## License and Disclaimer
Copyright 2021 DeepMind Technologies Limited.
Box collision code ([`engine_collision_box.c`](https://github.com/google-deepmind/mujoco/blob/main/src/engine/engine_collision_box.c))
is Copyright 2016 Svetoslav Kolev.
ReStructuredText documents, images, and videos in the `doc` directory are made
available under the terms of the Creative Commons Attribution 4.0 (CC BY 4.0)
license. You may obtain a copy of the License at
https://creativecommons.org/licenses/by/4.0/legalcode.
Source code is licensed under the Apache License, Version 2.0. You may obtain a
copy of the License at https://www.apache.org/licenses/LICENSE-2.0.
This is not an officially supported Google product.
[build from source]: https://mujoco.readthedocs.io/en/latest/programming#building-from-source
[Getting Started]: https://mujoco.readthedocs.io/en/latest/programming#getting-started
[Unity]: https://unity.com/
[releases page]: https://github.com/google-deepmind/mujoco/releases
[mujoco.readthedocs.io]: https://mujoco.readthedocs.io
[changelog]: https://mujoco.readthedocs.io/en/latest/changelog.html
[Python bindings]: https://mujoco.readthedocs.io/en/stable/python.html#python-bindings
[PyPI]: https://pypi.org/project/mujoco/