phase2-unreal/Compute/README.md

Optional CUDA build-field pass

This DLL is not the Unreal renderer. Unreal renders the world through DX12, Nanite, Lumen, and hardware ray tracing when the project is run on a supported configuration. The DLL provides a small GPU compute pass for repository build-field weights and is loaded dynamically by FGitWorldCudaBridge.

Build from a Visual Studio Developer Command Prompt with the CUDA toolkit installed:

cmake -S Compute -B Compute/build -G "Visual Studio 17 2022" -A x64
cmake --build Compute/build --config Release

Copy Compute/build/Release/GitWorldCuda.dll into Binaries/Win64/, or set GITWORLD_CUDA_DLL to an absolute path before launching Unreal. If the DLL is absent or the device pass fails, the world remains playable using the deterministic CPU fallback.