UE crashes when converting metahuman skeletal mesh to static mesh

Calips · July 7, 2022, 10:17am

I am trying to create a static mesh from MetaHuman generated charaters.
This bug report appears on both using UE 5.0.2 and UE 4.27.

Procedure:

Create MetaHuman character. 2 characters were created. 1 with the new MetaHuman for UE5
and 1 with the original MetaHuman UE4
Download it and insert in the scene using Bridge
Right click on model → Convert “model” to static mesh (UE4.27)
or Actor → Convert “model” to static mesh (UE 5.0.2).
Editor waits for a moment then crash

Log UE4:

LoginId:c231ec0c42396f693c1b40a19f336353
EpicAccountId:5053e413c7044ab8acef51c59a422230

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 703] Array index out of bounds: 1301 from an array of size 1301

UE4Editor_Core
UE4Editor_Core
UE4Editor_MeshUtilities
UE4Editor_MeshUtilities
UE4Editor_MeshUtilities
UE4Editor_MeshUtilities
UE4Editor_MeshUtilities
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
user32
user32
UE4Editor_ApplicationCore
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

Log UE5:

LoginId:c231ec0c42396f693c1b40a19f336353
EpicAccountId:5053e413c7044ab8acef51c59a422230

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 691] Array index out of bounds: 6393 from an array of size 6393

UnrealEditor_MeshUtilities!SkinnedMeshToRawMeshes() [D:\build\++UE5\Sync\Engine\Source\Developer\MeshUtilities\Private\MeshUtilities.cpp:353]
UnrealEditor_MeshUtilities!FMeshUtilities::ConvertMeshesToStaticMesh() [D:\build\++UE5\Sync\Engine\Source\Developer\MeshUtilities\Private\MeshUtilities.cpp:561]
UnrealEditor_MeshUtilities!FMeshUtilities::ConvertActorMeshesToStaticMeshUIAction() [D:\build\++UE5\Sync\Engine\Source\Developer\MeshUtilities\Private\MeshUtilities.cpp:6396]
UnrealEditor_MeshUtilities!TBaseRawMethodDelegateInstance<0,FMeshUtilities,void __cdecl(void),FDefaultDelegateUserPolicy,TArray<AActor *,TSizedDefaultAllocator<32> > >::ExecuteIfSafe() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:469]
UnrealEditor_Slate!SMenuEntryBlock::OnClicked() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1157]
UnrealEditor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1108]
UnrealEditor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,1,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
UnrealEditor_Slate!SButton::ExecuteOnClick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:464]
UnrealEditor_Slate!SButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:389]
UnrealEditor_Slate!SMenuEntryButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:434]
UnrealEditor_Slate!<lambda_51e270ca99ea7ce852539efd04dd453f>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4961]
UnrealEditor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_51e270ca99ea7ce852539efd04dd453f> >() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:405]
UnrealEditor_Slate!FSlateApplication::RoutePointerUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4947]
UnrealEditor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5495]
UnrealEditor_Slate!FSlateApplication::OnMouseUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5460]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2210]
UnrealEditor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2699]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1078]
UnrealEditor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:916]
user32
user32
UnrealEditor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:138]
UnrealEditor!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5139]
UnrealEditor!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:183]
UnrealEditor!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147]
UnrealEditor!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283]
UnrealEditor!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330]
UnrealEditor!__scrt_common_main_seh() [d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

Any idea where this is coming from?
Can anyone test this to see if it is systematic for others?

Thanks in advance.

SeRroZ · November 22, 2022, 12:16pm

Hello ! I Had the same problem as you, removing the grooms components from the actor blueprint solved the crash when converting for me

baskeyx · December 17, 2022, 2:40pm

Hey! Can you explain what I need to remove and how to remove them? I’m getting the same issue when attempting to assign the m_tal_nrw_body skeletal mesh to the SK_Mannequin skeleton. I’ve removed some of the advanced grooming features from the metahuman, played around with the grooming plugins but it constantly crashes for me.

F1rools22 · August 1, 2023, 5:00pm

I have the same issue. Removing the groom components hasn’t solved the issue for me (it’s also made everyone bald which isn’t exactly ideal)

useronym · February 6, 2024, 1:02pm

Bump. Still happening in 5.3.

TartAgent7 · March 7, 2024, 2:55pm

Same issue here, Unreal engine 5.3.2, when trying to convert Ada metahuman blueprint to staic mesh, my engine crashes. Same issue reported “Array index out of bounds: x from and array of size x” Please has anyone found a solution to this?