Unreal Engine Issues and Bug Tracker (UE-35602)

Description

Crash occurs when casting back to the pawn owner from the Anim Graph. In this case, it is being used for "Copy Pose from Mesh"

Workaround: Cast to Owner from Event Graph, defining variable as the Master Mesh. Then using that variable in the Anim Graph. (See other TestBP and AnimBP in attached project)

Error message:

Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 833] Array index out of bounds: 0 from an array of size 0

Source Context:

   50       if(Value && *Value!=INDEX_NONE)
   51       {
   52       const int32 SourceBoneIndex = *Value;
   53       const int32 ParentIndex = CurrentlyUsedSourceMeshComponent.Get()->SkeletalMesh->RefSkeleton.GetParentIndex(SourceBoneIndex);
   54       const FCompactPoseBoneIndex MyParentIndex = RequiredBones.GetParentBoneIndex(PoseBoneIndex);
   55       // only apply if I also have parent, otherwise, it should apply the space bases
   56       if (ParentIndex != INDEX_NONE && MyParentIndex != INDEX_NONE)
   57       {
   58       const FTransform& ParentTransform = CurrentlyUsedSourceMeshComponent.Get()->GetComponentSpaceTransforms()[ParentIndex];
   59       const FTransform& ChildTransform = CurrentlyUsedSourceMeshComponent.Get()->GetComponentSpaceTransforms()[SourceBoneIndex];
   60       OutPose[PoseBoneIndex] = ChildTransform.GetRelativeTransform(ParentTransform);
   61       }
   62       else
   63       {
   64 ***** OutPose[PoseBoneIndex] = CurrentlyUsedSourceMeshComponent.Get()->GetComponentSpaceTransforms()[SourceBoneIndex];
   65       }
   66       }
   67       }
   68       }
   69       }
   70       
   71       void FAnimNode_CopyPoseFromMesh::GatherDebugData(FNodeDebugData& DebugData)
   72       {
   73       }
   74       
   75       void FAnimNode_CopyPoseFromMesh::ReinitializeMeshComponent(FAnimInstanceProxy* AnimInstanceProxy)
   76       {
   77       CurrentlyUsedSourceMeshComponent = SourceMeshComponent;
   78       BoneMapToSource.Reset();
   79       if (SourceMeshComponent && SourceMeshComponent->SkeletalMesh && !SourceMeshComponent->IsPendingKill())

Most recent user affected CL: 3106830

Logs: [Link Removed]

CrashReporter User Descriptions:

EUS Matt.Williams - Cast to Owner from AnimBP Graph

Steps to Reproduce

Open the attached project
Open the "BadTestCharacter" BP in the content browser
Select the "TestMesh" component
In the details panel, set AnimClass to "BadAnimBP"

Result: Crash
Expected: AnimBP is assigned as expected

Callstack

UE4Editor_AnimGraphRuntime!FAnimNode_CopyPoseFromMesh::Evaluate() [animnode_copyposefrommesh.cpp:65]
UE4Editor_Engine!FPoseLink::Evaluate() [animnodebase.cpp:237]
UE4Editor_Engine!FAnimInstanceProxy::EvaluateAnimationNode() [animinstanceproxy.cpp:786]
UE4Editor_Engine!FAnimInstanceProxy::EvaluateAnimation() [animinstanceproxy.cpp:776]
UE4Editor_Engine!UAnimInstance::ParallelEvaluateAnimation() [animinstance.cpp:553]
UE4Editor_Engine!USkeletalMeshComponent::EvaluateAnimation() [skeletalmeshcomponent.cpp:1113]
UE4Editor_Engine!USkeletalMeshComponent::PerformAnimationEvaluation() [skeletalmeshcomponent.cpp:1174]
UE4Editor_Engine!USkeletalMeshComponent::RefreshBoneTransforms() [skeletalmeshcomponent.cpp:1351]
UE4Editor_Engine!USkeletalMeshComponent::InitAnim() [skeletalmeshcomponent.cpp:422]
UE4Editor_Engine!USkeletalMeshComponent::OnRegister() [skeletalmeshcomponent.cpp:338]
UE4Editor_Engine!UActorComponent::ExecuteRegisterEvents() [actorcomponent.cpp:1145]
UE4Editor_Engine!UActorComponent::RegisterComponentWithWorld() [actorcomponent.cpp:878]
UE4Editor_Engine!UActorComponent::RegisterComponent() [actorcomponent.cpp:932]
UE4Editor_Engine!`anonymous namespace'::RegisterInstancedComponent() [simpleconstructionscript.cpp:29]
UE4Editor_Engine!USimpleConstructionScript::ExecuteScriptOnActor() [simpleconstructionscript.cpp:553]
UE4Editor_Engine!AActor::ExecuteConstruction() [actorconstruction.cpp:669]
UE4Editor_Engine!AActor::RerunConstructionScripts() [actorconstruction.cpp:469]
UE4Editor_Engine!AActor::PostEditChangeProperty() [actoreditor.cpp:114]
UE4Editor_Engine!APawn::PostEditChangeProperty() [pawn.cpp:912]
UE4Editor_CoreUObject!UObject::PostEditChange() [obj.cpp:285]
UE4Editor_UnrealEd!FBlueprintEditorUtils::PostEditChangeBlueprintActors() [blueprinteditorutils.cpp:7522]
UE4Editor_Kismet!FBlueprintEditor::NotifyPostChange() [blueprinteditor.cpp:7407]
UE4Editor_PropertyEditor!FPropertyNode::NotifyPostChange() [propertynode.cpp:2067]
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() [propertyhandleimpl.cpp:464]
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() [propertyhandleimpl.cpp:315]
UE4Editor_PropertyEditor!FPropertyValueImpl::SetValueAsString() [propertyhandleimpl.cpp:737]
UE4Editor_DetailCustomizations!FSkeletalMeshComponentDetails::OnClassPicked() [skeletalmeshcomponentdetails.cpp:363]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FSkeletalMeshComponentDetails,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:317]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FSkeletalMeshComponentDetails,0,void __cdecl() [delegateinstancesimpl.h:424]
UE4Editor_ClassViewer!SClassViewer::OnClassViewerSelectionChanged() [sclassviewer.cpp:2197]
UE4Editor_ClassViewer!TBaseSPMethodDelegateInstance<0,SClassViewer,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:317]
UE4Editor_ClassViewer!TBaseSPMethodDelegateInstance<0,SClassViewer,0,void __cdecl() [delegateinstancesimpl.h:424]
UE4Editor_ClassViewer!TBaseDelegate<void,TSharedPtr<FClassViewerNode,0>,enum ESelectInfo::Type>::ExecuteIfBound() [delegatesignatureimpl.inl:608]
UE4Editor_ClassViewer!SListView<TSharedPtr<FClassViewerNode,0> >::Private_SignalSelectionChanged() [slistview.h:638]
UE4Editor_ClassViewer!STableRow<TSharedPtr<FString,0> >::OnMouseButtonUp() [stablerow.h:449]
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>

Community References

Traces fail on perpoly SkeletalMesh using MasterPoseComponent

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Fixed

Component	OLD - Anim
Affects Versions	4.13
Target Fix	4.14

Fix Commit	3013905
Main Commit	3136620

Created	Sep 6, 2016
Resolved	Sep 6, 2016
Updated	May 18, 2020

UE-35602

Crash when casting to owner from AnimGraph

Crash when casting to owner from AnimGraph

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