in news:web.3f9f529736b6a6bb3c1dcda40@news.povray.org Kronix wrote:

> I have a black and white image, say for instance, a white circle on a
> black background.  Is there a simple way to create an object by
> extruding the white circle (lying in, say, the xy plane) some
> distance along the z-axis? 

Beside the options Chris already gave you, you could open your image in 
The Gimp, use select by color to create a path, convert the path to 
something POV-Ray understands and use it in a prism. See:
http://members.home.nl/seedseven/#gimpov

Ingo

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