Lewis wrote:
> 
> It's NOT a laser. The  cylinder on the left is a flash light, with a
> piece of plastic blocking it. There is a thin, long, hole in the plastic
> which allows a thin beam of *regular* light to go out.

But such a beam would break up into different colours after leaving the
prism. The standard POV can't simulate that. By using a monochromatic
light source such as a laser this wouldn't happen (and the output of POV
would be correct! :-) ).

Marc
-- 
Marc Schimmler

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