Why is my identity transform not valid?

Development Programming & Scripting C++
1

In my setup code I have this:



newTile->Transform = FTransform();
newTile->Transform.NormalizeRotation();
newTile->Dirty = true;
newTile->Valid = true;

And later on I am adding that tile to a Hierarchical Static Mesh Instance (HISM):



if (TileMeshInstances.Contains(tileMesh))
{
	UHierarchicalInstancedStaticMeshComponent* hism = TileMeshInstances[tileMesh];
	hism->AddInstance(tile->Transform);
}
else
{
	int32 hismCount = TileMeshInstances.Num();
	FString hismName = FString::Printf(TEXT("TileMeshInstance_%d"), hismCount);
	UHierarchicalInstancedStaticMeshComponent* hism = NewObject<UHierarchicalInstancedStaticMeshComponent>(this, UHierarchicalInstancedStaticMeshComponent::StaticClass(), *hismName);
	hism->RegisterComponent();
	hism->AttachTo(RootComponent);
	hism->AddInstance(tile->Transform);
	TileMeshInstances.Add(tileMesh, hism);
}

However whenever I try to add a new Instance to the HISM, I get an exception complaining that my rotation is not normalized. So as you can see in the setup code I very specifically added a second call after adding the transform, to normalize the rotation (whatever the heck that means) but it still won’t work and says it isn’t normalized.

2

Hmm ok it looks like I have a bug somewhere. I just printed out my transform at the time of adding it, and its not correct. It has been set to all 0’s, no matter what it was originally.

3

Try doing FTransform::Identity();

4

The normal constructor gives you a proper identity. I had a logic error in my code.