Unreal Engine Issues

UE-184375

Crash after generating HLODs for approximated meshes that have all triangles culled

Crash after generating HLODs for approximated meshes that have all triangles culled

Description

The crash occurs when FWorldPartitionHLODUtilities::BuildHLOD attempts to build an approximated mesh that has all of its contents culled during generation, this can happen when an approximated mesh is configured with the "EGroundPlanePolicy::FixedZHeightGroundPlane" GroundPlanePolicy, and all of the static meshes for this specific WP HLOD actor are below the GroundZPlaneHeight.

 

See UDN for more details.

Steps to Reproduce

see issue case information

Callstack
[2023.04.26-17.05.48:061][  0]LogWindows: Error: === Critical error: ===
[2023.04.26-17.05.48:062][  0]LogWindows: Error: 
[2023.04.26-17.05.48:062][  0]LogWindows: Error: Assertion failed: Owner->IsMeshDescriptionValid(0) [File:C:\Build\UE5-Main\Engine\Source\Runtime\Engine\Private\StaticMesh.cpp] [Line: 3071] 
[2023.04.26-17.05.48:063][  0]LogWindows: Error: Bad MeshDescription on /Game/__ExternalActors__/Level/E/WR/Z2TA70682ZP7545VJHTVBA.StaticMesh_HLODLayer_Merged_0
[2023.04.26-17.05.48:064][  0]LogWindows: Error: 
[2023.04.26-17.05.48:064][  0]LogWindows: Error: 
[2023.04.26-17.05.48:064][  0]LogWindows: Error: [Callstack] 0x00007ffdc060a899 UnrealEditor-Engine.dll!UStaticMesh::CacheDerivedData() [C:\Build\UE5-Main\Engine\Source\Runtime\Engine\Private\StaticMesh.cpp:5419]
[2023.04.26-17.05.48:065][  0]LogWindows: Error: [Callstack] 0x00007ffdc061eaec UnrealEditor-Engine.dll!UStaticMesh::ExecutePostLoadInternal() [C:\Build\UE5-Main\Engine\Source\Runtime\Engine\Private\StaticMesh.cpp:6130]
[2023.04.26-17.05.48:066][  0]LogWindows: Error: [Callstack] 0x00007ffdc061b4cc UnrealEditor-Engine.dll!FAsyncTask<FStaticMeshAsyncBuildWorker>::DoTaskWork() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:626]
[2023.04.26-17.05.48:068][  0]LogWindows: Error: [Callstack] 0x00007ffdbeb6d3f3 UnrealEditor-Engine.dll!FAsyncTaskBase::DoWork() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:289]
[2023.04.26-17.05.48:069][  0]LogWindows: Error: [Callstack] 0x00007ffdbeb6cf4e UnrealEditor-Engine.dll!FAsyncTaskBase::DoThreadedWork() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:313]
[2023.04.26-17.05.48:070][  0]LogWindows: Error: [Callstack] 0x00007ffdd3225ac3 UnrealEditor-Core.dll!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Misc\QueuedThreadPoolWrapper.h:141]
[2023.04.26-17.05.48:071][  0]LogWindows: Error: [Callstack] 0x00007ffdd3225ac3 UnrealEditor-Core.dll!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Misc\QueuedThreadPoolWrapper.h:141]
[2023.04.26-17.05.48:072][  0]LogWindows: Error: [Callstack] 0x00007ffdd320dac7 UnrealEditor-Core.dll!`LowLevelTasks::FTask::Init<`FQueuedLowLevelThreadPool::AddQueuedWork'::`2'::<lambda_1> >'::`11'::<lambda_1>::operator()() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:499]
[2023.04.26-17.05.48:074][  0]LogWindows: Error: [Callstack] 0x00007ffdd321d0f3 UnrealEditor-Core.dll!LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48>::TTaskDelegateImpl<`LowLevelTasks::FTask::Init<`FQueuedLowLevelThreadPool::AddQueuedWork'::`2'::<lambda_1> >'::`11'::<lambda_1>,0>::CallAndMove() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Async\Fundamental\TaskDelegate.h:171]
[2023.04.26-17.05.48:076][  0]LogWindows: Error: [Callstack] 0x00007ffdd2e38425 UnrealEditor-Core.dll!LowLevelTasks::FTask::ExecuteTask() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:627]
[2023.04.26-17.05.48:077][  0]LogWindows: Error: [Callstack] 0x00007ffdd2e3830c UnrealEditor-Core.dll!LowLevelTasks::FScheduler::ExecuteTask() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:172]
[2023.04.26-17.05.48:078][  0]LogWindows: Error: [Callstack] 0x00007ffdd2e18f1c UnrealEditor-Core.dll!LowLevelTasks::FScheduler::TryExecuteTaskFrom<LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue,&LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue::DequeueGlobal,0>() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:350]
[2023.04.26-17.05.48:080][  0]LogWindows: Error: [Callstack] 0x00007ffdd2e5ede2 UnrealEditor-Core.dll!LowLevelTasks::FScheduler::WorkerMain() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:378]
[2023.04.26-17.05.48:081][  0]LogWindows: Error: [Callstack] 0x00007ffdd2e27900 UnrealEditor-Core.dll!UE::Core::Private::Function::TFunctionRefCaller<`LowLevelTasks::FScheduler::CreateWorker'::`2'::<lambda_1>,void __cdecl(void)>::Call() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Public\Templates\Function.h:479]
[2023.04.26-17.05.48:152][  0]LogWindows: Error: [Callstack] 0x00007ffdd30050e1 UnrealEditor-Core.dll!FThreadImpl::Run() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Private\HAL\Thread.cpp:67]
[2023.04.26-17.05.48:153][  0]LogWindows: Error: [Callstack] 0x00007ffdd34e9bb2 UnrealEditor-Core.dll!FRunnableThreadWin::Run() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:149]
[2023.04.26-17.05.48:154][  0]LogWindows: Error: [Callstack] 0x00007ffdd34e0577 UnrealEditor-Core.dll!FRunnableThreadWin::GuardedRun() [C:\Build\UE5-Main\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:79]
[2023.04.26-17.05.48:155][  0]LogWindows: Error: [Callstack] 0x00007ffe9bf57604 KERNEL32.DLL!UnknownFunction []
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Fixed
ComponentUE - World Creation - Worldbuilding Tools - HLOD
Target Fix5.3
Fix Commit25215145
Main Commit25219751
CreatedApr 26, 2023
ResolvedApr 27, 2023
UpdatedMay 29, 2023
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