box2d-lite
PhysX
| box2d-lite | PhysX | |
|---|---|---|
| 3 | 18 | |
| 806 | 2,296 | |
| - | 1.7% | |
| 0.0 | 4.7 | |
| over 4 years ago | 20 days ago | |
| C++ | C++ | |
| MIT License | BSD 3-clause "New" or "Revised" License |
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box2d-lite
PhysX
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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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Rust Game Physics Engines: PhysX, Rapier, XPBD & Others
NVIDIA PhysX GitHub repo: NVIDIA-Omniverse/PhysX
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Recommended Physics Engine?
I don’t know of any books but here is the official documentation which includes an API reference. You can also find a lot of sample code snippets and examples on their GitHub.
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C# Game engine - suggestions
On the other hand, PhysX is available under the MIT License and is both heavily used in games and also well documented with tons of sample code.
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AMD Finally Opens Up Its Radeon Raytracing Analyzer "RRA" Source Code
The CPU implementation of PhysX is too, no reason you couldn't port that to run on AMD GPUs: https://github.com/NVIDIA-Omniverse/PhysX
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Nvidia PhysX 5.0 is now open source
The LICENSE.md file on the repo doesn't mention BSD-3-Clause at all, it's just a copywrite notice that reads more like CC-BY than a software license. That's why I said it was weird.
Very! I just picked a random file: https://github.com/NVIDIA-Omniverse/PhysX/blob/release/104.0/physx/source/physx/src/NpArticulationJointReducedCoordinate.cpp
- GitHub - NVIDIA-Omniverse/PhysX: NVIDIA PhysX SDK - 5.0
What are some alternatives?
Box2D - Box2D is a 2D physics engine for games
RayTracingDenoiser - NVIDIA Ray Tracing Denoiser
reactphysics3d - Open source C++ physics engine library in 3D
physx-rs - 🎳 Rust binding for NVIDIA PhysX 🦀
Chipmunk - A fast and lightweight 2D game physics library.
PhysX - NVIDIA PhysX SDK
mujoco - Multi-Joint dynamics with Contact. A general purpose physics simulator.
JoltPhysics - A multi core friendly rigid body physics and collision detection library, written in C++, suitable for games and VR applications.
sofa - Real-time multi-physics simulation with an emphasis on medical simulation.
AI4Animation - Bringing Characters to Life with Computer Brains in Unity
qu3e - Lightweight and Simple 3D Open Source Physics Engine in C++
Bullet - Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.