>um... subject kinda says it all.  i remember way back when, there being
>the whole question of modelling a sparkling diamond.  the proposed
>answers hinted at rendering the scene 3 times.  once with a red light,
>once a green, and once a blue.  then composite them.  of course, each
>render would see the light's wavelength altered such that the images
>would be different.  unfortunately, i don't remember how this could (or
>IF it could) be accomplished
>

You could try rendering the scene three times, each with a differently
colored
light (rgb <1,0,0> ; <0,1,0> and <0,0,1> would be favorite) and a different
IOR
for the diamond - and the composite the images.

A finer approach would be, with the animation clock variable:
(1) vary the color of lighting according to the light spectrum
     to simulate different wavelengths;
(2) at the same time, vary the ior value, according to the real
     ior(wavelength law);
(3) composite the resulting images (as many as you want)

Don't ask me about how to get a monochromatic wavelenght
in rgb color space, nor the ior(wavelength) formula :-)

I hope this helps you...

(I would be interested to see the results)

Ray-tracingly,


Philippe

phi### [at] hotmailcom

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