Unreal Engine Issues

UE-151841

Engine crashes when building GPU Lightmass in large scenes

Engine crashes when building GPU Lightmass in large scenes

Description

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

Steps to Reproduce
  1. Open CitySample or any other large project with a considerable amount of textures
  2. Turn GPU Lightmass plugin ON
  3. Restart engine
  4. Build GPU Lightmass

Actual Result: Engine crashes while building GPU Lightmass
Expected Result: Engine does not crash and builds as expected

Callstack
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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Backlogged
ComponentUE - Graphics Features
Affects Versions5.0.1, 5.1
CreatedMay 12, 2022
ResolvedApr 6, 2023
UpdatedJan 13, 2025
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