Wasn't it Wolfgang Manousek who wrote:

>no clue on my side ... how would I create a spiral in POV ... just doesn't
>map into any CSG object ...

You can build one out of lots of smaller objects (such as smooth
triangles, spheres, cylinders, blobs or parts of tori) or use MegaPOV's
"spiral" isosurface (see http://www.econym.demon.co.uk/isotut/builtin1.h
tm).

-- 
Mike Williams
Gentleman of Leisure

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