Hi there, we are having a problem with our archviz project. The editor crashes when using the gpu lightmass official plugin. This happens the moment we enable nanite on our meshes. Without nanite enabled, it seems to work.
This is happening with 5.5. We previously did another project with unreal 5.3 and we were able to bake lights with nanite meshes.
We’ve tested with lightmap chanels, lightmap index coordinates, lightmap resolutions, gpu lightmass settings, GI settings, with sunsky and ultra dynamic sky. Textures in our project have a limit of 2048. Datasmith and gpu drivers (rtx 4090) are updated. We are out of ideas, I’ll leave what the crash window shows. Any help will be apreciated, thanks!
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]
0x00007ff98fd4f03c UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff99b8a5d3f UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff99b8ffb1b UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff99bba24e8 UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff99bb46415 UnrealEditor-Renderer.dll!UnknownFunction
0x00007ff98fd76fa6 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff98fd77da2 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff98fd68d24 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff98fdcac55 UnrealEditor-GPULightmass.dll!UnknownFunction
0x00007ff9dee7c2f5 UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff9deea9fff UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff9b0892722 UnrealEditor-Core.dll!UnknownFunction
0x00007ff9b0887d4a UnrealEditor-Core.dll!UnknownFunction
0x00007ff9b08881ee UnrealEditor-Core.dll!UnknownFunction
0x00007ff9deed894c UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff9deedd9e4 UnrealEditor-RenderCore.dll!UnknownFunction
0x00007ff9b0ebc0ad UnrealEditor-Core.dll!UnknownFunction
0x00007ff9b0eb35cf UnrealEditor-Core.dll!UnknownFunction
0x00007ffa7ecfe8d7 KERNEL32.DLL!UnknownFunction