You may be interested in this, written for a local computer graphics
and mathematics group 
   http://astronomy.swin.edu.au/~pbourke/povray/representation/
I would also like any useful comments why figure 2 is so slow to
compute. I know there are some obvious small things like the 2pi
and perhaps changing the range but even so the compute time seemed
excessive.
-- 
Paul Bourke
pdb_NOSPAMswin.edu.au

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