I found an issue with using VirtualHeightfieldMesh.
I am trying to follow Youtube tutorial: https://youtu.be/cV2YhjAiogY
But I encountered engine crashes after I made an VirtualHeightfieldMesh visible in editor.
When it is visible only in game - game works for some time (longer then editor), but eventually also crashes.
I started with UE 5.5.0 where it crashed nearly immediately, then updated to 5.5.3 and now it crashes after 15-20s in editor.
In my example I am not writing to “NewRuntimeVirtualTexture”, but it doesn’t matter - I can initialize it all with zeros, with some real level data, but nothing changes.
Generally this VirtualHeightfieldMesh works! I can see for a moment proper shape in editor as well as in game.
What helps - setting Platforms->Windows->DefaultGraphicsRHI to DX11, but as UE5 goes into DX12 it do not looks like valid solution.
Any ideas why it happens and how to fix it?
I know that feature is experimental, but looks like it works for others.
What I did to reproduce problem:
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create empty game project “blank” (I can zip it all and send - it is 25MB zip)
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add plugin “virtual heightfield mesh”
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enable “virtual texture support”
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add to level “VirtualHeightfieldMesh”
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created “NewRuntimeVirtualTexture” with virtual texture content set to “World height”
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Landscape instance “Draw in Virtual Textures” set to “NewRuntimeVirtualTexture”, executed “Create Volume” to create “RuntimeVirtualTextureVolume”
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“RuntimeVirtualTextureVolume” bounds set to “Landscape” with “expand bounds” set to 100
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in “VirtualHeightfieldMesh” heightfield set to my virtual texture
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built minmax texture
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disable “Actor Hidden In Editor” for “VirtualHeightfieldMesh”
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error message appears nearly immediately in log:
LogOutputDevice: Error: === Handled ensure: ===
LogOutputDevice: Error: Ensure condition failed: Query->SyncPoint [File:D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Query.cpp] [Line: 324]
LogOutputDevice: Error: Attempt to get result data for an FRHIRenderQuery that was never used in a command list.
LogOutputDevice: Error: Stack:
LogOutputDevice: Error: [Callstack] 0x00007ffc4a308ffd UnrealEditor-D3D12RHI.dll!FRHICommandListBase::GetScratchShaderParameters'::6’::<lambda_1>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Query.cpp:324]
LogOutputDevice: Error: [Callstack] 0x00007ffc4a2343da UnrealEditor-D3D12RHI.dll!FD3D12DynamicRHI::RHIGetRenderQueryResult() [D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Query.cpp:324]
LogOutputDevice: Error: [Callstack] 0x00007ffc6f06714a UnrealEditor-Renderer.dll!FVirtualTextureFeedback::Map() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureFeedback.cpp:259]
LogOutputDevice: Error: [Callstack] 0x00007ffc6f066e24 UnrealEditor-Renderer.dll!FVirtualTextureFeedback::Map() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureFeedback.cpp:356]
LogOutputDevice: Error: [Callstack] 0x00007ffc6f0a198e UnrealEditor-Renderer.dll!FVirtualTextureSystem::BeginUpdate() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureSystem.cpp:2690]
LogOutputDevice: Error: [Callstack] 0x00007ffc6f0a27fe UnrealEditor-Renderer.dll!FVirtualTextureSystem::BeginUpdate() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureSystem.cpp:2820]
LogOutputDevice: Error: [Callstack] 0x00007ffc6de84f84 UnrealEditor-Renderer.dll!FDeferredShadingSceneRenderer::Render() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\DeferredShadingRenderer.cpp:1390]
LogOutputDevice: Error: [Callstack] 0x00007ffc6ec65236 UnrealEditor-Renderer.dll!RenderViewFamilies_RenderThread() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:5431]
LogOutputDevice: Error: [Callstack] 0x00007ffc6ec1c29a UnrealEditor-Renderer.dll!UE::RendererPrivateUtils::Implementation::TPersistentBuffer<UE::HLSL::FCellBlockData,UE::RendererPrivateUtils::Implementation::FStructuredBufferTraits>::ValidateGPUData<FSceneCullingBuilder::UploadToGPU’::51'::<lambda_1> >'::12’::<lambda_1>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneRendering.cpp:5734]
LogOutputDevice: Error: [Callstack] 0x00007ffcd3dec2e5 UnrealEditor-RenderCore.dll!FRenderCommandPipeRegistry::StopRecording'::2’::<lambda_1>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp:1541]
LogOutputDevice: Error: [Callstack] 0x00007ffcd3e19fef UnrealEditor-RenderCore.dll!TGraphTask<TFunctionGraphTaskImpl<void __cdecl(void),1> >::ExecuteTask() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:634]
LogOutputDevice: Error: [Callstack] 0x00007ffcc1d92722 UnrealEditor-Core.dll!UE::Tasks::Private::FTaskBase::TryExecuteTask() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Tasks\TaskPrivate.h:504]
LogOutputDevice: Error: [Callstack] 0x00007ffcc1d87d4a UnrealEditor-Core.dll!FNamedTaskThread::ProcessTasksNamedThread() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:779]
LogOutputDevice: Error: [Callstack] 0x00007ffcc1d881ee UnrealEditor-Core.dll!FNamedTaskThread::ProcessTasksUntilQuit() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:668]
LogOutputDevice: Error: [Callstack] 0x00007ffcd3e4893c UnrealEditor-RenderCore.dll!RenderingThreadMain() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp:317]
LogOutputDevice: Error: [Callstack] 0x00007ffcd3e4d9d4 UnrealEditor-RenderCore.dll!FRenderingThread::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp:443]
LogOutputDevice: Error: [Callstack] 0x00007ffcc23bc0bd UnrealEditor-Core.dll!FRunnableThreadWin::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:159]
LogOutputDevice: Error: [Callstack] 0x00007ffcc23b35df UnrealEditor-Core.dll!FRunnableThreadWin::GuardedRun() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:79]
LogOutputDevice: Error: [Callstack] 0x00007ffd12f77374 KERNEL32.DLL!UnknownFunction
LogOutputDevice: Error: [Callstack] 0x00007ffd14d7cc91 ntdll.dll!UnknownFunction
LogStats: SubmitErrorReport - 0.000 s
LogStats: SendNewReport - 0.681 s
LogStats: FDebug::EnsureFailed - 0.899 s -
then editor crashes after some time with various reasons (access violation or some asserts about reference counter below zero etc), but always from FVirtualTextureFeedback::TransferGPUToCPU()
example “access violation”:
LoginId:6c8b81404ff48cfb7b458c8d4b15ff05
EpicAccountId:aa82e69b669446e6aaf4ad73cc89be27
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000070
UnrealEditor_D3D12RHI!FD3D12DynamicRHI::RHIEndRenderQuery_TopOfPipe() [D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Query.cpp:212]
UnrealEditor_Renderer!FVirtualTextureFeedback::TransferGPUToCPU() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureFeedback.cpp:207]
UnrealEditor_Renderer!TRDGLambdaPass<RuntimeVirtualTexture::FShader_VirtualTextureCopy::FParameters,RuntimeVirtualTexture::AddCopyPass<0>'::2’::<lambda_1> >::Execute() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Public\RenderGraphPass.h:703]
UnrealEditor_RenderCore!FRDGBuilder::ExecutePass() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderGraphBuilder.cpp:3360]
UnrealEditor_RenderCore!FRDGTraceGraphMessageFields::Initialize'::2’::<lambda_1>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderGraphBuilder.cpp:2903]
UnrealEditor_RenderCore!UE::Tasks::Private::FTaskBase::TryExecuteTask() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Tasks\TaskPrivate.h:504]
UnrealEditor_RenderCore!LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __ptr64 __cdecl(bool),48>::TTaskDelegateImpl<LowLevelTasks::FTask::Init<UE::Tasks::Private::FTaskBase::Init’::2'::<lambda_1> >'::13’::<lambda_1>,0>::CallAndMove() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\TaskDelegate.h:171]
UnrealEditor_Core!LowLevelTasks::FTask::ExecuteTask() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:627]
UnrealEditor_Core!LowLevelTasks::FScheduler::ExecuteTask() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:245]
UnrealEditor_Core!LowLevelTasks::FScheduler::WorkerLoop() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:514]
UnrealEditor_Core!LowLevelTasks::FScheduler::CreateWorker'::2’::<lambda_1>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:75]
UnrealEditor_Core!FThreadImpl::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\Thread.cpp:69]
UnrealEditor_Core!FRunnableThreadWin::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:159]
other reason:
Assertion failed: (OldPacked & DeletingBit) == 0 [File:D:\build++UE5\Sync\Engine\Source\Runtime\RHI\Public\RHIResources.h] [Line: 154]
UnrealEditor_RHI!FRHIResource::MarkForDelete() [D:\build++UE5\Sync\Engine\Source\Runtime\RHI\Private\RHIResources.cpp:49]
UnrealEditor_Renderer!FFeedbackGPUFencePool::Allocate() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureFeedback.cpp:114]
UnrealEditor_Renderer!FVirtualTextureFeedback::TransferGPUToCPU() [D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\VT\VirtualTextureFeedback.cpp:204]
