Engine crashes when building GPU lightmass in larger scenes. This does not occur on smaller maps like the Unreal Engine Templates. I was able to reproduce this issue in CitySamples SmallCity map.
This issue also occurs in 5.0.1
Actual Result: Engine crashes while building GPU Lightmass
Expected Result: Engine does not crash and builds as expected
Assertion failed: Index <= 0xffff [File:D:\P4\5.1Main\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureAllocator.cpp] [Line: 114]
UnrealEditor_Renderer!FVirtualTextureAllocator::AcquireBlock() [VirtualTextureAllocator.cpp:114] UnrealEditor_Renderer!FVirtualTextureAllocator::SubdivideBlock() [VirtualTextureAllocator.cpp:213] UnrealEditor_Renderer!FVirtualTextureAllocator::MarkBlockAllocated() [VirtualTextureAllocator.cpp:324] UnrealEditor_Renderer!FVirtualTextureAllocator::MarkBlockAllocated() [VirtualTextureAllocator.cpp:335] UnrealEditor_Renderer!FVirtualTextureAllocator::MarkBlockAllocated() [VirtualTextureAllocator.cpp:335] UnrealEditor_Renderer!FVirtualTextureAllocator::Alloc() [VirtualTextureAllocator.cpp:505] UnrealEditor_Renderer!FVirtualTextureSystem::AcquireSpace() [VirtualTextureSystem.cpp:811] UnrealEditor_Renderer!FAllocatedVirtualTexture::FAllocatedVirtualTexture() [AllocatedVirtualTexture.cpp:97] UnrealEditor_Renderer!FVirtualTextureSystem::AllocateVirtualTexture() [VirtualTextureSystem.cpp:662] UnrealEditor_GPULightmass!GPULightmass::FLightmapPreviewVirtualTexture::FLightmapPreviewVirtualTexture() [LightmapPreviewVirtualTexture.cpp:58] UnrealEditor_GPULightmass!<lambda_981a586319f50e135455e5d11603dc34>::operator() [Scene.cpp:1067] UnrealEditor_GPULightmass!TEnqueueUniqueRenderCommandType<`GPULightmass::FScene::AddGeometryInstanceFromComponent'::`2'::RenderThreadInitName,<lambda_981a586319f50e135455e5d11603dc34> >::DoTask() [RenderingThread.h:193] UnrealEditor_GPULightmass!TGraphTask<TEnqueueUniqueRenderCommandType<`GPULightmass::FScene::AddGeometryInstanceFromComponent'::`2'::RenderThreadInitName,<lambda_981a586319f50e135455e5d11603dc34> > >::ExecuteTask() [TaskGraphInterfaces.h:1276] UnrealEditor_Core!FNamedTaskThread::ProcessTasksNamedThread() [TaskGraph.cpp:761] UnrealEditor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [TaskGraph.cpp:650] UnrealEditor_Core!FTaskGraphCompatibilityImplementation::ProcessThreadUntilRequestReturn() [TaskGraph.cpp:2128] UnrealEditor_RenderCore!RenderingThreadMain() [RenderingThread.cpp:380] UnrealEditor_RenderCore!FRenderingThread::Run() [RenderingThread.cpp:527] UnrealEditor_Core!FRunnableThreadWin::Run() [WindowsRunnableThread.cpp:149]
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-151841 in the post.
| 11 |
| Component | UE - Graphics Features |
|---|---|
| Affects Versions | 5.0.1, 5.1 |
| Created | May 12, 2022 |
|---|---|
| Resolved | Apr 6, 2023 |
| Updated | Jan 13, 2025 |