Hello, i’m currently having the same problem where the GPU Lightmass crash after trying to build on a small level that has only 1 pointlight and a mesh, here is the error message:
Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp] [Line: 863]
Rendering thread exception:
Assertion failed: GeometrySegmentIndex == RayTracingMeshCommand.GeometrySegmentIndex [File:D:\build++UE5\Sync\Engine\Plugins\Experimental\GPULightmass\Source\GPULightmass\Private\Scene\Scene.h] [Line: 50]
0x00007ff934a1f03c UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff950d25d3f UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff950d7fb1b UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff9510224e8 UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff950fc6415 UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff934a46fa6 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff934a47da2 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff934a39dc1 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff934a9b0c1 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff972cec2f5 UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff972d19fff UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff96fe22722 UnrealEditor-Core.dll!UnknownFunction
0x00007ff96fe17d4a UnrealEditor-Core.dll!UnknownFunction
0x00007ff96fe181ee UnrealEditor-Core.dll!UnknownFunction
0x00007ff972d4894c UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff972d4d9e4 UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff97044c0ad UnrealEditor-Core.dll!UnknownFunction
0x00007ff9704435cf UnrealEditor-Core.dll!UnknownFunction
0x00007ffa6515e8d7 KERNEL32.DLL!UnknownFunction
Is there a particular way to fix it? Or a github repos of the plugin where I can manually download it for the version for Unreal 5.5.4?