Wasn't it Justin Smith who wrote:
>I'm looking for any tutorials on how to create isosurfaces to represent the
>shapes I want. I have read the included documentation on isosurfaces that
>comes with POV-Ray, but I did not understand it very well. I understand
>that the shape is defined by the "function { ... }" line of the isosurface
>object, but I did not understand how the specific example functions produce
>the images shown attributed to them. Any help with other tutorials on this
>matter out there? Thanks.

You might try <http://www.econym.demon.co.uk/isotut/>, but some of the
stuff I wrote there has ended up in the documentation, so some of it
won't be new to you.

-- 
Mike Williams
Gentleman of Leisure

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