Description

While verifying a bug for 4.15 UE-39952 , I tried to repro in 4.14.2 and the editor crashed while attempting to import the attached FBX

In 4.15, the Editor does NOT crash a window pops up stating that it failed and to see details in the output log. In the output log, it reads:
FBXImport:Error: Error MultiMat_Sphere could not be created because all of its triangles are degenerate.

This is a Regression from 4.14.1 CL 3223369

Steps to Reproduce
  1. Import attached FBX into any project in 4.14.2
  2. Importer Settings should be left as default. Make sure Convert Scene Unit is NOT checked
  3. Click Import

Result: The editor crashes

Expected Result: The editor does not crash

Callstack
UE4Editor_UnrealEd!TSet<TPair<unsigned int,FMeshSectionInfo>,TDefaultMapKeyFuncs<unsigned int,FMeshSectionInfo,0>,FDefaultSetAllocator>::operator=( set.h:244 
UE4Editor_UnrealEd!UnFbx::FFbxImporter::ReorderMaterialToFbxOrder() fbxstaticmeshimport.cpp:1602 
UE4Editor_UnrealEd!UFbxFactory::FactoryCreateBinary() fbxfactory.cpp:297 
UE4Editor_UnrealEd!UFactory::FactoryCreateFile() factory.cpp:75 
UE4Editor_UnrealEd!UFactory::ImportObject() factory.cpp:150 
UE4Editor_AssetTools!FAssetTools::ImportAssetsInternal() assettools.cpp:1375 
UE4Editor_AssetTools!FAssetTools::ImportAssets() assettools.cpp:628 
UE4Editor_AssetTools!FAssetTools::ImportAssets() assettools.cpp:561 
UE4Editor_ContentBrowser!SContentBrowser::ImportAsset() scontentbrowser.cpp:790 
UE4Editor_ContentBrowser!SContentBrowser::HandleImportClicked() scontentbrowser.cpp:781 
UE4Editor_ContentBrowser!TMemberFunctionCaller<SContentBrowser,FReply() delegateinstanceinterface.h:161 
UE4Editor_ContentBrowser!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SContentBrowser,FReply() tuple.h:116 
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,FReply __cdecl() delegateinstancesimpl.h:318 
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() delegatesignatureimpl.inl:522 
UE4Editor_Slate!SButton::OnMouseButtonUp() sbutton.cpp:275 
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() slateapplication.cpp:5010 
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() slateapplication.cpp:215 
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:4999 
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5462 
UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5439 
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1652 
UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:2071 
UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:814 
UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:678 
user32!<Unknown> 
user32!<Unknown> 
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:951 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2811 
UE4Editor!GuardedMain() launch.cpp:152 
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
Fix Commit3247630
Main Commit3389599
Release Commit3247630
CreatedDec 22, 2016
ResolvedJan 5, 2017
UpdatedApr 27, 2018
View Jira Issue