Oh I see what you are saying now. I never thought of doing anything like that... you're sort of morphing as you draw if you do it your way. Very interesting. It would be CPU intensive but it wouldn't matter in my case because my software computes all of the frames before the show even starts... takes lots of memory but low CPU usage during playback.
But, with my way of computing the entire frame at one angle I don't see any problems so I am not likely to try it. It is very interesting, though.