Unreal Engine Issues and Bug Tracker (UE-38585)

Description

When you have an actor with a Hierarchical Instanced Static Mesh component that has a Static Mesh set and is populated with at least 1 instance and then duplicate it or move it to another level, it will cause a crash.

User who reported this mentioned the following about a possible fix:

"It seems internal ClusterTree not been serialized correctly in the actor copy/paste process. One possible fix is to make sure HierarchicalInstancedStaticMeshComponent::BuildTree() been called after actor with HierarchicalInstancedStaticMeshComponent been pasted in to the level."

Regression?: Yes
This did not occur in 4.12.5-3039270+++UE4+Release-4.12
This does occur in 4.13.2-3172292+++UE4+Release-4.13

Steps to Reproduce

First reproduction by duplicating:

Add an Empty Actor to the level
Add a Hierarchical Instance Static Mesh component to the Empty Actor
Set a Static Mesh
Add one instance
Ensure that the Actor is selected (not the component), right-click the actor in the level and duplicate it
Result: The editor crashes
Expected: The actor should duplicate without an issue

Reproduction from moving the asset to another level:

Create two levels
Inside of the first level, add an Empty Actor
Add a Hierarchical Instance Static Mesh component to the Empty Actor
Set a Static Mesh
Add one instance
Ensure that the Actor is selected (not the component), open the "Levels" window from the "Windows" menu.
Click "Levels" > "Add Existing" and select the second level
Right-click on the newly added level and select "Move Selected Actors to Level"
Attempt to move the actor in the level with the transform widget
Result: The editor crashes
Expected: The actor should move without an issue.

Callstack

First reproduction's callstack:

 UE4Editor_Engine!UHierarchicalInstancedStaticMeshComponent::UpdateInstanceTransform() hierarchicalinstancedstaticmesh.cpp:2004 
UE4Editor_Engine!UInstancedStaticMeshComponent::OnUpdateTransform() instancedstaticmesh.cpp:1549 
UE4Editor_Engine!USceneComponent::PropagateTransformUpdate() scenecomponent.cpp:506 
UE4Editor_Engine!USceneComponent::UpdateComponentToWorldWithParent() scenecomponent.cpp:434 
UE4Editor_Engine!USceneComponent::UpdateComponentToWorld() scenecomponent.h:766 
UE4Editor_Engine!USceneComponent::UpdateChildTransforms() scenecomponent.cpp:2002 
UE4Editor_Engine!USceneComponent::PropagateTransformUpdate() scenecomponent.cpp:525 
UE4Editor_Engine!USceneComponent::UpdateComponentToWorldWithParent() scenecomponent.cpp:434 
UE4Editor_Engine!USceneComponent::InternalSetWorldLocationAndRotation() scenecomponent.cpp:2389 
UE4Editor_Engine!USceneComponent::MoveComponentImpl() scenecomponent.cpp:2512 
UE4Editor_Engine!USceneComponent::SetRelativeLocationAndRotation() scenecomponent.cpp:1006 
UE4Editor_Engine!USceneComponent::SetRelativeLocationAndRotation() scenecomponent.cpp:1024 
UE4Editor_Engine!USceneComponent::SetWorldLocationAndRotation() scenecomponent.cpp:1242 
UE4Editor_Engine!AActor::TeleportTo() actor.cpp:394 
UE4Editor_UnrealEd!UUnrealEdEngine::edactPasteSelected() editoractor.cpp:334 
UE4Editor_UnrealEd!DuplicateSelectedActors::FDuplicateJob::DuplicateActorsToLevel() editoractor.cpp:412 
UE4Editor_UnrealEd!UUnrealEdEngine::edactDuplicateSelected() editoractor.cpp:526 
UE4Editor_UnrealEd!UUnrealEdEngine::Exec_Actor() unrealedsrv.cpp:2670 
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() unrealedsrv.cpp:681 
UE4Editor_UnrealEd!UEditorEngine::Exec() editorserver.cpp:5503 
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() unrealedsrv.cpp:624 
UE4Editor_LevelEditor!FLevelEditorActionCallbacks::ExecuteExecCommand() leveleditoractions.cpp:1633 
UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl() delegateinstancesimpl.h:1017 
UE4Editor_Slate!FUICommandList::ExecuteAction() uicommandlist.cpp:92 
UE4Editor_Slate!SMenuEntryBlock::OnClicked() smenuentryblock.cpp:1027 
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() smenuentryblock.cpp:987 
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply() delegateinstanceinterface.h:161 
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply() tuple.h:115 
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl() delegateinstancesimpl.h:317 
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() delegatesignatureimpl.inl:521 
UE4Editor_Slate!SButton::OnMouseButtonUp() sbutton.cpp:278 
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() smenuentryblock.cpp:385 
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>

Second reproduction's callstack:

 UE4Editor_Engine!UHierarchicalInstancedStaticMeshComponent::UpdateInstanceTransform() hierarchicalinstancedstaticmesh.cpp:2004 
UE4Editor_Engine!UInstancedStaticMeshComponent::OnUpdateTransform() instancedstaticmesh.cpp:1549 
UE4Editor_Engine!USceneComponent::PropagateTransformUpdate() scenecomponent.cpp:506 
UE4Editor_Engine!USceneComponent::UpdateComponentToWorldWithParent() scenecomponent.cpp:434 
UE4Editor_Engine!USceneComponent::UpdateComponentToWorld() scenecomponent.h:766 
UE4Editor_Engine!USceneComponent::UpdateChildTransforms() scenecomponent.cpp:2002 
UE4Editor_Engine!USceneComponent::PropagateTransformUpdate() scenecomponent.cpp:525 
UE4Editor_Engine!USceneComponent::UpdateComponentToWorldWithParent() scenecomponent.cpp:434 
UE4Editor_Engine!USceneComponent::InternalSetWorldLocationAndRotation() scenecomponent.cpp:2389 
UE4Editor_Engine!USceneComponent::MoveComponentImpl() scenecomponent.cpp:2512 
UE4Editor_Engine!USceneComponent::SetRelativeLocationAndRotation() scenecomponent.cpp:1006 
UE4Editor_Engine!USceneComponent::SetRelativeTransform() scenecomponent.cpp:1132 
UE4Editor_Engine!USceneComponent::SetWorldTransform() scenecomponent.cpp:1229 
UE4Editor_Engine!AActor::EditorApplyTranslation() actoreditor.cpp:459 
UE4Editor_UnrealEd!UEditorEngine::ApplyDeltaToActor() editorengine.cpp:2348 
UE4Editor_UnrealEd!FLevelEditorViewportClient::ApplyDeltaToActor() leveleditorviewport.cpp:3551 
UE4Editor_UnrealEd!FLevelEditorViewportClient::ApplyDeltaToActors() leveleditorviewport.cpp:3231 
UE4Editor_UnrealEd!FLevelEditorViewportClient::InputWidgetDelta() leveleditorviewport.cpp:2316 
UE4Editor_UnrealEd!FEditorViewportClient::UpdateMouseDelta() editorviewportclient.cpp:1954 
UE4Editor_UnrealEd!FEditorViewportClient::Tick() editorviewportclient.cpp:1077 
UE4Editor_UnrealEd!FLevelEditorViewportClient::Tick() leveleditorviewport.cpp:2016 
UE4Editor_UnrealEd!UEditorEngine::Tick() editorengine.cpp:1476 
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() unrealedengine.cpp:371 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2834 
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>

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Fixed

Component	UE - Graphics Features
Affects Versions	4.13.2, 4.14, 4.15
Target Fix	4.15

Fix Commit	3227211
Main Commit	3231696

Created	Nov 14, 2016
Resolved	Dec 8, 2016
Updated	Apr 27, 2018

View Jira Issue

UE-38585

Duplicating / Moving (to another level) an actor with a Hierarchical Instanced Static Mesh component causes a crash

Duplicating / Moving (to another level) an actor with a Hierarchical Instanced Static Mesh component causes a crash

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