Unreal Engine Issues

UE-34377

Crash when importing an Alembic file with Materials as a different asset type than one that already exists

Crash when importing an Alembic file with Materials as a different asset type than one that already exists

Description

This will occur when changing between all Import Types (so long as Create Materials is checked). The callstacks are slightly different depending on which Import Type you switch to.

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Steps to Reproduce

REPRO STEPS:

  1. Load QAGame in the editor
  2. Click Import from the Content Browser
  3. Navigate to \Engine\Content\NotForLicensees\QA\Import_Test_Assets\AlembicAssets and select MaterialImportTest.abc, then click Open
  4. Select Import Type Static Mesh
  5. Scroll down and check Create Materials
  6. Click Import
  7. Click Import from the Content Browser again
  8. Navigate to \Engine\Content\NotForLicensees\QA\Import_Test_Assets\AlembicAssets and select MaterialImportTest.abc, then click Open
  9. Change the Import Type to Geometry Cache (and ensure Create Materials is still checked)
  10. Click Import

RESULT:
Editor crashes

Callstack
Access violation - code c0000005 (first/second chance not available)
UE4Editor_Engine!UMaterialInterface::GetRelevance_Concurrent() materialinterface.cpp:116 
UE4Editor_Engine!UMeshComponent::GetMaterialRelevance() meshcomponent.cpp:87 
UE4Editor_GeometryCache!FGeometryCacheSceneProxy::FGeometryCacheSceneProxy() geometrycachesceneproxy.cpp:10 
UE4Editor_GeometryCache!UGeometryCacheComponent::CreateSceneProxy() geometrycachecomponent.cpp:155 
UE4Editor_Renderer!FScene::AddPrimitive() rendererscene.cpp:633 
UE4Editor_Engine!UActorComponent::RecreateRenderState_Concurrent() actorcomponent.cpp:1202 
UE4Editor_GeometryCacheEd!FGeometryCacheThumbnailScene::SetGeometryCache() geometrycachethumbnailscene.cpp:39 
UE4Editor_GeometryCacheEd!UGeometryCacheThumbnailRenderer::Draw() geometrycachethumbnailrenderer.cpp:29 
UE4Editor_UnrealEd!ThumbnailTools::RenderThumbnail() objecttools.cpp:3816 
UE4Editor_UnrealEd!FAssetThumbnailPool::Tick() assetthumbnail.cpp:969 
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() tickableeditorobject.h:17 
UE4Editor_UnrealEd!UEditorEngine::Tick() editorengine.cpp:1181 
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() unrealedengine.cpp:371 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2834 
UE4Editor!GuardedMain() launch.cpp:156 
UE4Editor!GuardedMainWrapper() launchwindows.cpp:126 
UE4Editor!WinMain() launchwindows.cpp:202 
UE4Editor!__scrt_common_main_seh() exe_common.inl:264 
kernel32!<Unknown> 
ntdll!<Unknown>

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Fixed
ComponentUE - Gameplay
Affects Versions4.13
Target Fix4.13
Fix Commit3082294
Main Commit3092051
Release Commit3082294
CreatedAug 8, 2016
ResolvedAug 9, 2016
UpdatedApr 27, 2018
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