Unreal Engine Issues and Bug Tracker (UE-54423)

Description

Engine crashes when asset has been reimported multiple times through the mesh editor
-Editor crashes in Main when reimporting
-Editor crashes in 4.17 when changing the Import Transforms

Steps to Reproduce

Download attached project
Open static mesh SM_grass001
See Transform settings in the Details panel of mesh editor (both Z transforms are set to 100)
Go to Asset < Reimport SM_grass001
Reimport a few times (about 4 or 5)
Note that the grass location changes and eventually resets to its original location
Editor will crash

Expected: Editor does not crash after asset has been reimported multiple times
Results: Editor crashes after asset is reimported multiple times

Callstack

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EpicAccountId:1ed52ca976af4368b6c30d11b7cdc18f

Assertion failed: LightMapCoordinateIndex < (int)GetNumTexCoords() && LightMapCoordinateIndex >= 0 [File:D:\Main Workspace\Engine\Source\Runtime\Engine\Private\Rendering\StaticMeshVertexBuffer.cpp] [Line: 485]

UE4Editor_Core!FDebug::AssertFailed() [d:\main workspace\engine\source\runtime\core\private\misc\assertionmacros.cpp:419]
UE4Editor_Engine!FStaticMeshVertexBuffer::BindLightMapVertexBuffer() [d:\main workspace\engine\source\runtime\engine\private\rendering\staticmeshvertexbuffer.cpp:486]
UE4Editor_Engine!FInstancedStaticMeshRenderData::InitStaticMeshVertexFactories() [d:\main workspace\engine\source\runtime\engine\private\instancedstaticmesh.cpp:610]
UE4Editor_Engine!TGraphTask<TEnqueueUniqueRenderCommandType<`FInstancedStaticMeshRenderData::ReInitVertexFactories'::`2'::CallInitStaticMeshVertexFactoryName,<lambda_419fe0e00f28e07334541444dcd273da> > >::ExecuteTask() [d:\main workspace\engine\source\runtime\core\public\async\taskgraphinterfaces.h:829]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\main workspace\engine\source\runtime\core\private\async\taskgraph.cpp:665]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\main workspace\engine\source\runtime\core\private\async\taskgraph.cpp:574]
UE4Editor_RenderCore!RenderingThreadMain() [d:\main workspace\engine\source\runtime\rendercore\private\renderingthread.cpp:331]
UE4Editor_RenderCore!FRenderingThread::Run() [d:\main workspace\engine\source\runtime\rendercore\private\renderingthread.cpp:465]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\main workspace\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]

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EpicAccountId:1ed52ca976af4368b6c30d11b7cdc18f

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Engine!UHierarchicalInstancedStaticMeshComponent::BuildTreeIfOutdated() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\hierarchicalinstancedstaticmesh.cpp:2366]
UE4Editor_Foliage!TBaseRawMethodDelegateInstance<0,FFoliageMeshInfo,void __cdecl(FBoxSphereBounds const & __ptr64)>::ExecuteIfSafe() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:648]
UE4Editor_Engine!TBaseMulticastDelegate<void,FBoxSphereBounds const & __ptr64>::Broadcast() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:937]
UE4Editor_Engine!UStaticMesh::CalculateExtendedBounds() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\staticmesh.cpp:2242]
UE4Editor_Engine!UStaticMesh::Build() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\staticmeshbuild.cpp:169]
UE4Editor_Engine!UStaticMesh::PostEditChangeProperty() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\staticmesh.cpp:1790]
UE4Editor_CoreUObject!UObject::PostEditChangeChainProperty() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:436]
UE4Editor_PropertyEditor!FPropertyNode::NotifyPostChange() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\propertyeditor\private\propertynode.cpp:2360]
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:558]
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:358]
UE4Editor_PropertyEditor!FPropertyHandleFloat::SetValue() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:3106]
UE4Editor_DetailCustomizations!FMathStructCustomization::SetValue<float>() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\detailcustomizations\private\mathstructcustomizations.cpp:472]
UE4Editor_DetailCustomizations!FMathStructCustomization::OnValueCommitted<float>() [d:\build\++ue4+release-4.17+compile\sync\engine\source\editor\detailcustomizations\private\mathstructcustomizations.cpp:406]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FMathStructCustomization,0,TTypeWrapper<void> __cdecl(float,enum ETextCommit::Type),TWeakPtr<IPropertyHandle,0> >::Execute() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FMathStructCustomization,0,void __cdecl(float,enum ETextCommit::Type),TWeakPtr<IPropertyHandle,0> >::ExecuteIfSafe() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:434]
UE4Editor_DetailCustomizations!SSpinBox<float>::CommitValue() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\public\widgets\input\sspinbox.h:858]
UE4Editor_DetailCustomizations!SSpinBox<float>::TextField_OnTextCommitted() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\public\widgets\input\sspinbox.h:784]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,SSpinBox<float>,0,TTypeWrapper<void> __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::Execute() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,SSpinBox<float>,0,void __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::ExecuteIfSafe() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:434]
UE4Editor_Slate!FSlateEditableTextLayout::HandleFocusLost() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\widgets\text\slateeditabletextlayout.cpp:697]
UE4Editor_Slate!FSlateApplication::SetUserFocus() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:2795]
UE4Editor_Slate!FSlateApplication::SetUserFocus() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:2497]
UE4Editor_Slate!FSlateApplication::ProcessReply() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:3191]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_7097b900f0e4be30d80fb18f98c51ea0> >() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:233]
UE4Editor_Slate!FSlateApplication::RoutePointerDownEvent() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5093]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5050]
UE4Editor_Slate!FSlateApplication::OnMouseDown() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4968]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1726]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:2161]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:881]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:721]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3151]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\build\++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll

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Fixed

Component	UE - World Creation - Worldbuilding Tools - Foliage
Affects Versions	4.17.2, 4.18.3, 4.19, 4.20
Target Fix	4.19

Fix Commit	3897036
Main Commit	3990065
Release Commit	3897036

Created	Jan 24, 2018
Resolved	Feb 19, 2018
Updated	Apr 27, 2018

View Jira Issue

UE-54423

Crash Occurs When Mesh is Reimported Multiple Times in the Mesh Editor

Crash Occurs When Mesh is Reimported Multiple Times in the Mesh Editor

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