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Imagine a ship in space, it can move in any direction, regardless of where it may happen to be pointing. I'm working with that kind of thing. So yes I've got my X, Y and Z axis speeds, which together make up a vector and I can use that to work out a direction of movement. But rather than go through all the logic and figuring out to do that manually (I haven't done vector math since I was in school....which was 'a while' ago), I wondered if there's anything that actually tells you what direction you are moving in.