The Afro nous apporta ses lumieres ainsi en ce 2004/05/03 15:23... :

>"CFM" <nomail@nomail> wrote in message
>news:web.40968d72d4d8861bb90c55f80@news.povray.org
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>>I'm new to POV-ray, and I can't get photons to refract through the
>>glass cylinder. Check out the programming language below, and see
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>>interior {dispersion 1.1}
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>don't forget to include the ior in the interior statement, for glass it is
>1.5 ish
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Water ior around 1.3 to 1.4 for fresh to salt water.
Also, increase max_trace_level to around 12... That's the level I had to 
use to get rid of the warning. You have an ambient value of 1 for the 
ground, it hides the effect of the photons. Lower is or let it at the 
default value and increase the diffuse value if the ground is to dark 
(you may also lighten the colour map).

Alain

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