Description

Engine crashes on completing a simplygon merge of two actors

Note If you set On screen size to 50, you can speed up the merge to get to the crash quicker

Steps to Reproduce
  1. Compile and open the editor
  2. Open QAGame
  3. Locate asset Test_LavaKnight in the content browser
  4. Click floor in the level
  5. In the static mesh editor click on Window, Developer tools, Merge Actors.
  6. In the merge actors window click the 2nd Tab
    Harvest geometry from selected actors and merge them into single mesh
  7. Click Merge actors
  8. Select the Content folder as the save location name the save Test
    Result
    As you finish generating the mesh the editor will crash
Callstack

UE4Editor_MeshUtilities!ProxyMaterialUtilities::CreateProxyMaterialInstance() proxymaterialutilities.h:92
UE4Editor_MeshUtilities!FProxyGenerationProcessor::ProcessJob() meshutilities.cpp:376
UE4Editor_MeshUtilities!FProxyGenerationProcessor::Tick() meshutilities.cpp:289
UE4Editor_MeshUtilities!FMeshUtilities::CreateProxyMesh() meshutilities.cpp:5540
UE4Editor_MergeActors!FMeshProxyTool::RunMerge() meshproxytool.cpp:120
UE4Editor_MergeActors!SMergeActorsToolbar::OnMergeActorsClicked() smergeactorstoolbar.cpp:132
UE4Editor_MergeActors!TMemberFunctionCaller<SMergeActorsToolbar,FReply() delegateinstanceinterface.h:161
UE4Editor_MergeActors!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMergeActorsToolbar,FReply() tuple.h:115
UE4Editor_MergeActors!TBaseSPMethodDelegateInstance<0,SMergeActorsToolbar,0,FReply __cdecl() delegateinstancesimpl.h:317
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() delegatesignatureimpl.inl:521
UE4Editor_Slate!SButton::OnMouseButtonUp() sbutton.cpp:278
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() slateapplication.cpp:4901
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() slateapplication.cpp:215
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:4890
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5348
UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5328
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1584
UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:1930
UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:747
UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:669
user32!<Unknown>
user32!<Unknown>
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:905
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2788
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 Commit3077491
Main Commit3092051
Release Commit3077491
CreatedAug 4, 2016
ResolvedAug 4, 2016
UpdatedApr 27, 2018
View Jira Issue