bevy_xpbd
Box2D
bevy_xpbd | Box2D | |
---|---|---|
5 | 35 | |
959 | 7,308 | |
- | - | |
9.5 | 0.0 | |
about 1 month ago | about 2 months ago | |
Rust | C++ | |
Apache License 2.0 | MIT License |
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.
bevy_xpbd
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Rust Game Physics Engines: PhysX, Rapier, XPBD & Others
Bevy XPBD will move away from the XPBD solver in coming months, which is worth bearing in mind if you are considering using it for your project.
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The Bevy Foundation
[2]: https://github.com/Jondolf/bevy_xpbd/issues/346
- Bevy XPBD Moving Away from XPBD Solver over Nvidia Patent
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Bevy XPBD 0.2.0: Spatial queries, Bevy 0.11 support, and a lot more
Bevy XPBD is a 2D and 3D physics engine based on Extended Position Based Dynamics for the Bevy game engine. Unlike most other physics engines in the ecosystem, it uses the ECS directly, which removes the overhead of maintaining a separate physics world and makes the engine feel much more integrated into Bevy.
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Bevy XPBD: A physics engine for the Bevy game engine
Cool! FYI, I just made a PR that adds support for applying a force at a point (and applying torque accordingly) if that's what you meant: https://github.com/Jondolf/bevy_xpbd/pull/58
Box2D
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Blaze: A High Performance C++ Math library
For typical game physics engines... not that much. Math libraries like Eigen or Blaze use lots of template metaprogramming techniques under the hood that can help when you're doing large batched matrix multiplications (since it can remove temporary allocations at compile-time and can also fuse operations efficiently, as well as applying various SIMD optimizations), but it doesn't really help when you need lots of small operations (with mat3 / mat4 / vec3 / quat / etc.). Typical game physics engines tend to use iterative algorithms for their solvers (Gauss-Seidel, PBD, etc...) instead of batched "matrix"-oriented ones, so you'll get less benefits out of Eigen / Blaze compared to what you typically see in deep learning / scientific computing workloads.
The codebases I've seen in many game physics engines seem to all roll their own math libraries for these stuff, or even just use SIMD (SSE / AVX) intrinsics directly. Examples: PhysX (https://github.com/NVIDIA-Omniverse/PhysX), Box2D (https://github.com/erincatto/box2d), Bullet (https://github.com/bulletphysics/bullet3)...
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Jolt Physics raylib: trying 3D C++ Game Physics Engine
Box2D: 2D engine used in Unity and also earlier versions of Godot. Open source.
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Rust Game Physics Engines: PhysX, Rapier, XPBD & Others
Box2D GitHub repo: erincatto/box2d
- Nebula is an open-source and free-to-use modern C++ game engine
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Linear code is more readable
Why is 600 lines too long? How are you able to make that judgment call without first knowing what the algorithm is even doing? People setting arbitrary limits like this is what leads to convoluted spaghetti, instead of just taking things on a case by case basis. Here’s a function from the Box2D code running a particularly complex algorithm for solving contact velocities https://github.com/erincatto/box2d/blob/411acc32eb6d4f2e96fc... .
It’s 310 lines long. It reads very well, and it looks very maintainable. It has very clear comments explaining the reasoning behind the harder parts of the code. Would you reject this code because it’s pretty long? I wouldn’t.
There is no such thing as too long or too short. There’s overengineered and there’s underengineered and there’s a sweet spot in the middle that has the perfect amount of engineering with the least amount of complexity (preferably no additional complexity than the original problem warranted). Sometimes, the problem at hand is inherently a large algorithm and requires many lines of code. Don’t split it up! It just makes it harder for future maintainers who now have to figure out if the additional functions are actually being used elsewhere or if they’re just there to make the code “pretty”.
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How would you implement a simple collision system?
There is always the approach of looking at how an existing engine is implemented, such as box2d: https://github.com/erincatto/box2d
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C++23: The Next C++ Standard
TIL Box2D must not be serious code because it doesn't use copious amounts of explicit temporaries[0].
And just for the record, I'm very glad Erin Catto decided to use operator overloading in his code. It made it much easier for me to read and understand what the code was doing as opposed to it being overly verbose and noisy.
[0]: https://github.com/erincatto/box2d/blob/main/src/collision/b...
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Make a game engine in C++
For Physics Box2d can be used as a simple starting point.
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Does anyone know any good open source project to optimize?
I suspect most C++ physics libraries like Box2D (https://github.com/erincatto/box2d) or Bullet3 (https://github.com/bulletphysics/bullet3) could really benefit a lot from SIMD.
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what to start learning
for 2D physics have a look at Box2D it's amazing https://box2d.org/
What are some alternatives?
vviz - Rapid prototyping GUI, and visual printf-style debugging for computer vision development.
Bullet - Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.
thetawave - A physics based, space shooter game made with Rust and the Bevy engine.
Chipmunk - A fast and lightweight 2D game physics library.
raw-physics - Simple rigid-body physics simulator powered by XPBD.
raylib - A simple and easy-to-use library to enjoy videogames programming
bevy_dolly - h3r2tic's dolly abstraction layer for the bevy game framework
LiquidFun - 2D physics engine for games
term2d - A simple 2d drawing engine for terminal emulators.
PhysX - NVIDIA PhysX SDK
GameOfLife - Game of Life (2d cellular automata described by John Conway) in C, C++, Javascript, Python, Rust (plain Rust and with GGEZ), and Java (plain Java and with libgdx)
box2d-lite - A small 2D physics engine