Wasn't it Hugo who wrote:
>It seems these are very complex functions, so that's impressive. If they are
>parametric isosurfaces, I guess the render time hits the roof? But a nice
>addition to include in toturials, maybe even the Pov3.5 example files.
>Together with Ingo's parametric mesh macro, these sor's could be superior to
>the old sor keyword, because these will never have holes / errors when they
>render.

I've had an example of a parametric technique to achieve this sort of
effect on my isosurface tutorial page for quite a while
<http://www.econym.demon.co.uk/isotut/splines.htm>

-- 
Mike Williams
Gentleman of Leisure

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