src-thacker-2025-physx-gpu-open-source source
NVIDIA open-sources PhysX's GPU simulation code
locator
https://www.cgchannel.com/2025/04/nvidia-open-sources-physxs-gpu-simulation-code
notes
PhysX 5.6 and Flow 2.2 GPU source released under BSD-3 with over 500 CUDA kernels; previously GPU support shipped as binaries only; Unreal Engine 5 uses Chaos instead.