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Jan 24, 2011 at 2:42 comment added kangdon Hi Willie, thanks. I guess the natural thing to do is to use a Frenet-frame based on $C$, that is $X_1$=$\ddot{C}/|\ddot{C}|$, etc. I would love to be able to do this without needing to revert to any affine coordinates at all.
Jan 22, 2011 at 4:18 vote accept kangdon
Jan 20, 2011 at 13:46 history answered Willie Wong CC BY-SA 2.5