Unreal Engine Issues and Bug Tracker (UE-68490)

Description

This crash occurs when trying to retarget an animation onto another skeleton with a retargeting rig that references a virtual bone.

This issue could be similar to [Link Removed]

This issue was reported and tested in 4.20.3 (CL-4369336). It was reproduced in 4.21.1 (CL-4613538) and Main 4.22 (CL-4715968)

Steps to Reproduce

This repro uses the Kwang assets from the Marketplace but any skeleton/animation should repro

Open the UE4 Editor and create a Third Person Template project
Import Paragon: Kwang into the project
Navigate to 'UE4_Mannequin_Skeleton', add a virtual bone, set a 'Humanoid' retargeting rig and then click Show Advanced to set the virtual bone as Custom_1
Navigate to the other skeleton (in this case Kwang_Skeleton) and set up a 'Humanoid' retargeting rig but don't change any of the settings
Right-Click on one of the other skeleton's animations (Ability_Q_Catch) and select 'Retarget Anim Assets>Duplicate Anim Assets and Retarget'
Select the 'UE4_Mannequin_Skeleton' and click retarget

Results: The Editor crashes

Expected: The Editor doesn't crash and the animation is retargeted

Callstack

[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd4d32a388 KERNELBASE.dll!UnknownFunction []
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd176d6850 UE4Editor-ApplicationCore.dll!FWindowsErrorOutputDevice::Serialize() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowserroroutputdevice.cpp:65]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffce59b62fc UE4Editor-Core.dll!FOutputDevice::LogfImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffce59451db UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:425]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcdb4209d8 UE4Editor-Engine.dll!FillUpTransformBasedOnRig() [d:\build\++ue4\sync\engine\source\runtime\engine\private\animation\animsequence.cpp:3088]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcdb443143 UE4Editor-Engine.dll!UAnimSequence::RemapTracksToNewSkeleton() [d:\build\++ue4\sync\engine\source\runtime\engine\private\animation\animsequence.cpp:3177]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcdb4d83c9 UE4Editor-Engine.dll!UAnimationAsset::ReplaceSkeleton() [d:\build\++ue4\sync\engine\source\runtime\engine\private\animationasset.cpp:320]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcd90f672b UE4Editor-UnrealEd.dll!EditorAnimUtils::FAnimationRetargetContext::RetargetAnimations() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editoranimutils.cpp:269]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcd90f5374 UE4Editor-UnrealEd.dll!EditorAnimUtils::RetargetAnimations() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editoranimutils.cpp:343]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcd90f631a UE4Editor-UnrealEd.dll!EditorAnimUtils::RetargetAnimations() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editoranimutils.cpp:319]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd0c2a2602 UE4Editor-AssetTools.dll!FAssetTypeActions_AnimationAsset::RetargetAnimationHandler() [d:\build\++ue4\sync\engine\source\developer\assettools\private\assettypeactions\assettypeactions_animationasset.cpp:247]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd0c237890 UE4Editor-AssetTools.dll!TBaseSPMethodDelegateInstance<0,FAssetTypeActions_AnimationAsset,0,TTypeWrapper<void> __cdecl(USkeleton * __ptr64,USkeleton * __ptr64,bool,bool,bool,EditorAnimUtils::FNameDuplicationRule const * __ptr64),TArray<TWeakObjectPtr<UObject,FWeakObjectPtr>,FDefaultAllocator> >::Execute() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcd9944d1c UE4Editor-UnrealEd.dll!SAnimationRemapSkeleton::OnApply() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\sskeletonwidget.cpp:952]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffcd9911b3f UE4Editor-UnrealEd.dll!TBaseSPMethodDelegateInstance<0,SAnimationRemapSkeleton,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffce4da9c3b UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [d:\build\++ue4\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:290]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffce4b994c5 UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:268]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffce4c31db2 UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5472]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffce4c17c7a UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5979]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffce4c0b25c UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5959]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd176cd1c7 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1736]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd176c0270 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2182]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd176cf4c5 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:895]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd176bc209 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:732]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd4f576d41 USER32.dll!UnknownFunction []
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd4f576713 USER32.dll!UnknownFunction []
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd176d0646 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:129]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ff6082754e5 UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3417]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ff608285b3c UE4Editor.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:166]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ff608285bba UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:144]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ff608293dac UE4Editor.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ff608295aaa UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283]
[2019.01.14-17.58.30:242][396]LogWindows: Error: [Callstack] 0x00007ffd4f703034 KERNEL32.DLL!UnknownFunction []
[2019.01.14-17.58.30:243][396]LogWindows: Error: [Callstack] 0x00007ffd50743691 ntdll.dll!UnknownFunction []

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Fixed

Component	OLD - Anim
Affects Versions	4.21.1, 4.22, 4.20.3
Target Fix	4.22

Fix Commit	5241021
Main Commit	5241023
Release Commit	5241021

Created	Jan 14, 2019
Resolved	Feb 28, 2019
Updated	May 18, 2020

View Jira Issue

UE-68490

Retargeting an Animation to a Skeleton with a Virtual Bone causes the Engine to crash

Retargeting an Animation to a Skeleton with a Virtual Bone causes the Engine to crash

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