Paul Bourke wrote:
> You may be interested in this, written for a local computer graphics
> and mathematics group 
>    http://astronomy.swin.edu.au/~pbourke/povray/representation/

Good summary of the advantages of using POV-Ray for visualization tasks.

> 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.

the parametric object is quite inefficient, in most cases it will be 
much faster to use ingo's param.inc:

http://members.home.nl/seedseven/#param

see also:

http://www.econym.demon.co.uk/isotut/param.htm


Christoph

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