Description

FMeshMergeHelpers::RetrieveMesh crashes when trying to prep some skeletal meshes for material baking.

Steps to Reproduce
  1. Download and open "Car Configurator" project in Unreal Editor from marketplace ([Link Removed]).
  2. In Content Browser, search for "SK_Convertible_Top" and double click on the Skeletal Mesh asset to open it in an editor window called "SK_Convertible_Top".
  3. In the toolbar of window "SK_Convertible_Top", click "Bake out Materials" to open a dialog window called "Material Baking Options".
  4. In "Bake out Materials" window, click Confirm.Edit Steps to Reproduce
     
Callstack
Assertion failed: (Index >= 0) & (Index < ArrayNum) File:D:\Build&#43;+UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h 
[Line: 674] Array index out of bounds: 32 from an array of size 32 UE4Editor_Core!AssertFailedImplV() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:104] UE4Editor_Core!FDebug::CheckVerifyFailedImpl() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:461] UE4Editor_MeshMergeUtilities!DispatchCheckVerify<void,<lambda_b5c14ef3884adafb7fe831c17abccdec> >() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Misc\AssertionMacros.h:165] UE4Editor_MeshMergeUtilities!FMeshMergeHelpers::RetrieveMesh() 
[D:\Build\++UE4\Sync\Engine\Source\Developer\MeshMergeUtilities\Private\MeshMergeHelpers.cpp:332] UE4Editor_MeshMergeUtilities!FMeshMergeUtilities::BakeMaterialsForComponent() 
[D:\Build\++UE4\Sync\Engine\Source\Developer\MeshMergeUtilities\Private\MeshMergeUtilities.cpp:145] UE4Editor_MeshMergeUtilities!FMeshMergeUtilities::BakeMaterialsForComponent() 
[D:\Build\++UE4\Sync\Engine\Source\Developer\MeshMergeUtilities\Private\MeshMergeUtilities.cpp:459] UE4Editor_MeshMergeUtilities!<lambda_747c8298733ede9d136621237275d741>::operator()() 
[D:\Build\++UE4\Sync\Engine\Source\Developer\MeshMergeUtilities\Private\MeshMergeEditorExtensions.cpp:113] UE4Editor_MeshMergeUtilities!TBaseFunctorDelegateInstance<void _cdecl(FToolMenuContext const &),FDefaultDelegateUserPolicy,<lambda_747c8298733ede9d136621237275d741> >::ExecuteIfSafe() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:838] UE4Editor_ToolMenus!TBaseFunctorDelegateInstance<void __cdecl(void),FDefaultDelegateUserPolicy,<lambda_fccc1bd4ef83d8f2198f8e70891f6d41> >::ExecuteIfSafe() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:839] UE4Editor_Slate!SToolBarButtonBlock::OnClicked() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SToolBarButtonBlock.cpp:308] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290] UE4Editor_Slate!SButton::ExecuteOnClick() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385] UE4Editor_Slate!SButton::OnMouseButtonUp() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4815] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5356] UE4Editor_Slate!FSlateApplication::OnMouseUp() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5321] UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2178] UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2642] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1046] UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:878] user32 user32 UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130] UE4Editor!FEngineLoop::Tick() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4748] UE4Editor!GuardedMain() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169] UE4Editor!GuardedMainWrapper() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137] UE4Editor!WinMain() 
[D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268] UE4Editor!_scrt_common_main_seh() 
[d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288] kernel32 ntdll

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Fixed
ComponentTools
Affects Versions4.26.2
Target Fix4.27
Fix Commit16726879
Release Commit16726879
CreatedJun 22, 2021
ResolvedJun 23, 2021
UpdatedJun 25, 2021