Are you (btw.) aware that it is possible to declare user
defined functions in POV-Ray ?
I think your code can be improved by using some of those.
You can find some relevant source code for POV-Ray here:
http://astronomy.swin.edu.au/~pbourke/povray/supershape/
--
Tor Olav
http://subcube.net
http://subcube.com
