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I read that POV-Ray supports chromatic dispersion, so I designed a
scene that would demonstrate this but it doesn't seem to be working.

The simple scene has a light case generating a small effectively
collimated beam of light which is directed at a prism with a target on
the far side of the prism.  

I expected to get a rainbow pattern on the target, but instead the
light passes directly through the prism without refracting or
reflecting in any noticeable way.

The scene file:  http://www.twilley.org/~jmt/tmp/chromatic.pov
The output file:  http://www.twilley.org/~jmt/tmp/chromatic.png

For the output, I used the following command line:

povray -h600 -w800 +A +AM2 +R7 +J -ichromatic.pov

The "+A +AM2 +R7 +J" don't seem to really matter, though, because I
get effectively the same results without the added settings, and it
takes seven seconds instead of thirteen minutes on my machine.

What am I missing?

Jack.
- -- 
Jack Twilley
jmt at twilley dot org
http colon slash slash www dot twilley dot org slash tilde jmt slash
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