Maik Schmidt nous apporta ses lumieres en ce 2005-06-05 09:29:
> Hi!
> 
> I've programmed some scenes for my SF-story. Now I'm trying to make some 
>  plastic pyramids resembling the Icehouse Pieces from Looney Labs so I 
> can send "saved" game statuses via mail.
> 
> The form and setup will be no problem but I do not get the texture 
> right. I've tried around with filtered transparency and transmit values 
> and glas finishes but I do not get something looking like this:
> 
> http://wunderland.com/WhatsNewPics/2002/RainbowSpread.jpg
> 
> Does perhaps someone has a texture setting which makes my material look 
> something like that?
> 
> Sincerely,
> Maik Schmidt
The most realistic results are generaly achieved using a pigment of rgbt 1. The colour
comes fron 
the interior like this: interios{ior 1.4 fade_color ClearYellow fade_distance 1
fade_power 1 
dispersion 1.01} you may use fade_power 1000 also, both are good, use the one that
works best in 
your case.
Add some reflection in your finish, probably variable fresnel reflection. Adding
conserve_energy 
usualy help.
The opaque ones can be done with a regular pigment or by setting fade_distance to a
small value 
relative to the object's size.

Alain

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