Bullet VS mujoco

Compare Bullet vs mujoco and see what are their differences.

Bullet

Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc. (by bulletphysics)

mujoco

Multi-Joint dynamics with Contact. A general purpose physics simulator. (by google-deepmind)
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Bullet mujoco
40 20
11,765 7,026
1.7% 3.8%
3.4 9.8
7 days ago 3 days ago
C++ C++
GNU General Public License v3.0 or later Apache License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

Bullet

Posts with mentions or reviews of Bullet. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-06-07.

mujoco

Posts with mentions or reviews of mujoco. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-04-04.
  • Deep learning for robotics
    3 projects | /r/buildapc | 4 Apr 2022
    I am doing a MSc on robotics with a focus on machine learning, especially attention based architectures. There is a lot simulation and reinforcement learning going on. I have a funding of ~2500$ for the hardware system (no flexibility here, cannot use it for cloud either). I used pcpartpicker.com to select compatible components, as shown below. I am not located in the western part of the world; which means I have difficulty accessing some components and prices are higher here than that of pcpartpicker.com. That is why I am aiming towards 2000 - 2200$ range in the pcpartpicker.com. - Overall, what do you think of my planned setup? - Since there is a lot of simulation planned including rigid body dynamics with contact (libraries like https://github.com/raisimTech/raisimLib, https://github.com/deepmind/mujoco), I need some powerful CPU to use these libraries. I know that Intel has MKL over AMD; however, I am not sure how relevant that is for my case. The robotics simulators are generally written with C++, uses Eigen or their own math libraries. I feel like there is a lot of linear algebra involved and Intel combined with MKL should give me less headache. I have chosen i9-12900K, but what about AMD Ryzen9 5950X for example? - There is a new generation of rigid body simulators which use GPU instead of CPU (https://github.com/google/brax, https://developer.nvidia.com/isaac-gym). I do not think they are as mature as the previously mentioned simulators. Perhaps I am mistaken. Shall I focus on them instead? In terms of hardware that means I can downgrade the CPU to Ryzen5, and upgrade to RTX3080, roughly. - Do you think this system is easy to upgrade in future? What can I change to make it easier for long-term use and upgrades? Thanks for any help!
  • [D] Advice on Hardware Setup for Robotics
    3 projects | /r/MachineLearning | 4 Apr 2022
    Since there is a lot of simulation planned including rigid body dynamics with contact (libraries like https://github.com/raisimTech/raisimLib, https://github.com/deepmind/mujoco), I need some powerful CPU to use these libraries. I know that Intel has MKL over AMD; however, I am not sure how relevant that is for my case. The robotics simulators are generally written with C++, uses Eigen or their own math libraries. I feel like there is a lot of linear algebra involved and Intel combined with MKL should give me less headache. I have chosen i9-12900K, but what about AMD Ryzen9 5950X for example?
  • Julia 1.7 has been released
    15 projects | news.ycombinator.com | 30 Nov 2021
    I think I have a good news for you. Deep mind acquired and open sourced the project a few months ago.

    https://github.com/deepmind/mujoco

  • Most Popular C[++] Open-Source Physics Engines
    9 projects | /r/gamedev | 14 Nov 2021
  • DeepMind open-sourcing MuJoCo simulator
    3 projects | news.ycombinator.com | 18 Oct 2021
    They actually didn't open source it:

    >Free, unrestricted, precompiled binaries are available under the Apache 2.0 license.

    If you look at their source code here: https://github.com/deepmind/mujoco you will see that they provide only headers. Try finding impl for a function mj_makeEmptyFileVFS: https://github.com/deepmind/mujoco/search?q=mj_makeEmptyFile...

What are some alternatives?

When comparing Bullet and mujoco you can also consider the following projects:

PhysX - NVIDIA PhysX SDK

Box2D - Box2D is a 2D physics engine for games

CHRONO - High-performance C++ library for multiphysics and multibody dynamics simulations

Newton Dynamics - Newton Dynamics is an integrated solution for real time simulation of physics environments.

ODE

gazebo-classic - Gazebo classic. For the latest version, see https://github.com/gazebosim/gz-sim

brax - Massively parallel rigidbody physics simulation on accelerator hardware.

Simbody - High-performance C++ multibody dynamics/physics library for simulating articulated biomechanical and mechanical systems like vehicles, robots, and the human skeleton.

Godot - Godot Engine – Multi-platform 2D and 3D game engine

reactphysics3d - Open source C++ physics engine library in 3D

raylib - A simple and easy-to-use library to enjoy videogames programming

Chipmunk - A fast and lightweight 2D game physics library.