Thanks for the advice, I'll look into it.

ps Seeing that Klein bottle at your link there made me thinking.. How is
inside/outside defined for that shape? :)

sig.

Ken wrote:
> 
> I think you should be looking at the implicit or parametric surface
> functions rather than the isosurface function.
> 
> see - http://atrey.karlin.mff.cuni.cz/~0rfelyus/povray/index.html
> 
> --
> Ken Tyler -  1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
> http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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