Unreal Engine Issues and Bug Tracker (UE-34424)

Description

Attempting to add an instance to an Instance Static Mesh Component at runtime through code causes the editor to crash.

Steps to Reproduce

Open UE4 Editor (any project)
Add code to project based on Actor (MyActor)

Add the following to MyActor.h

Include statement for InstancedStaticMeshComponent class

Add below tick() declaration

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Test)
	FQuat NewRot;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Test)
		FTransform NewTrans;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Test)
		UInstancedStaticMeshComponent* InstMeshComp;

Add the following to MyActor.cpp

Add to constructor

	InstMeshComp = CreateDefaultSubobject<UInstancedStaticMeshComponent>(TEXT("InstMeshComp"));

	NewRot.X = 45;
	NewRot.Y = 45;
	NewRot.Z = 45;
	NewRot.W = 45;
	
	NewTrans.SetLocation(FVector(0, 0, 0));
	NewTrans.SetRotation(NewRot);

Add to BeginPlay()
```
InstMeshComp->AddInstance(NewTrans);
```

Compile code
Create blueprint based on MyActor (MyActorBP)
Set Static Mesh for Inst Mesh Comp to 1M_Cube
Add instance of MyActorBP to level
PIE

Result:
Editor crashes with callstack

Expected:
Instance of 1M_Cube is added and given the desired rotation

Callstack

MachineId:7156C35640F86204E61B8383F45DEE17
EpicAccountId:e8c7fa630b6440f69a25a2c64d6c482c

Assertion failed: IsRotationNormalized() [File:d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\math\TransformVectorized.h] [Line: 1257] 



UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:440]
UE4Editor_Engine!UInstancedStaticMeshComponent::SetupNewInstanceData() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\instancedstaticmesh.cpp:1657]
UE4Editor_Engine!UInstancedStaticMeshComponent::AddInstance() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\instancedstaticmesh.cpp:1428]
UE4Editor_Engine!AWorldSettings::NotifyBeginPlay() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\worldsettings.cpp:164]
UE4Editor_Engine!AGameMode::HandleMatchHasStarted() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\gamemode.cpp:623]
UE4Editor_Engine!AGameMode::SetMatchState() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\gamemode.cpp:733]
UE4Editor_Engine!AGameMode::StartMatch() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\gamemode.cpp:600]
UE4Editor_Engine!UWorld::BeginPlay() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\world.cpp:3218]
UE4Editor_Engine!UGameInstance::StartPIEGameInstance() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\gameinstance.cpp:293]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:3250]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:2346]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:1103]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:1246]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:368]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2775]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launch.cpp:148]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

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Won't Fix

Component	UE - Graphics Features
Affects Versions	4.12.5
Target Fix	4.13

Created	Aug 9, 2016
Resolved	Aug 9, 2016
Updated	May 2, 2018

View Jira Issue

UE-34424

Calling InstanceStaticMeshComponent::AddInstance in code causes the editor to crash when setting non-Zero rotation

Calling InstanceStaticMeshComponent::AddInstance in code causes the editor to crash when setting non-Zero rotation

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