UInstancedStaticMeshComponent AddInstance Exception

Development Asset Creation
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1

I am trying to use instanced static meshes in code. This is my current code to attempt to do so, when it gets down to AddInstance I get a blank exception in visual studio. This is an actor that is placed in the editor. I have also tried adding the instance in the BeginPlay function with the same results.

EDIT: I have determined it has something to do with the mesh. When I make the mesh null there is no crashing.

EDIT2: So I exposed the variables and set them through the editor. I still had the same crashes. So all I had left was removing the root node. It now doesn’t crash and adds instances, however I cant move it unless it has a root node.

ATerrainGenerator::ATerrainGenerator(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
	RootNode = ObjectInitializer.CreateDefaultSubobject<UStaticMeshComponent>(this, TEXT("RootNode"));
	RootComponent = RootNode;
	RootNode->SetCollisionProfileName(UCollisionProfile::NoCollision_ProfileName);

	static ConstructorHelpers::FObjectFinder<UStaticMesh> CubeMesh(TEXT("StaticMesh'/Game/Meshes/Cube.Cube'"));
	
	CubeInstances = ObjectInitializer.CreateDefaultSubobject<UInstancedStaticMeshComponent>(this, TEXT("CubeInstances"));

	check(CubeInstances);

	CubeInstances->AttachTo(RootComponent);
	CubeInstances->SetStaticMesh(CubeMesh.Object);

	FTransform InstanceTransform;

	InstanceTransform.SetLocation(FVector(0.0f, 0.0f, 0.0f));
	InstanceTransform.SetRotation(FQuat(0.0f, 0.0f, 0.0f, 0.0f));
	InstanceTransform.SetScale3D(FVector(1.0f, 1.0f, 1.0f));

	CubeInstances->AddInstance(InstanceTransform);
}
2

So I almost have a solution. Partially its my transform because when I comment the transform code out it runs. However now the editor crashes when I stop playing.

{
	Super::BeginPlay();

	FTransform InstanceTransform;

	//InstanceTransform.SetLocation(FVector(0.0f, 0.0f, 0.0f));
	//InstanceTransform.SetRotation(FQuat(0.0f, 0.0f, 0.0f, 0.0f));
	//InstanceTransform.SetScale3D(FVector(1.0f, 1.0f, 1.0f));

	CubeInstances->AddInstance(InstanceTransform);
}
3

I’d say it’s the InstanceTransform.SetRotation(FQuat(0.0f, 0.0f, 0.0f, 0.0f)); line. Give it a valid quaternion and you should be fine (give X, Y, or Z a non-zero value - probably set Y to 1).