I have managed to get the 3D tracking routines working for the most part. The screenie below has a tie fighter flying around its target, which then changes, in which case it reorientates and flies to it instead.
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This routine is a must for game scenarios as objects can now find their targets in 3D space. It was a bit of a pain to get working lol!
Also here is a camera lookAt test:
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Note that the stars are a quick hack and arent relative to the camera and there is no object sorting as yet (there is polygon sorting but its confined to per-object).