Am 12.10.2012 18:43, schrieb MichaelJF:
> Seems I have missed this discussion about gems due to RL issues. Your main idea
> seems to be to use the interior with fade_color to color the stones. I used a
> similiar approach for my stone of orloff mainly derived from a macro given by
> Bruno Cabasson. I only wonder about the pow(x,3). You have given the colors used
> in a later posting. Since this were floats you could even used the
> pow(x,3)-values instead. Is it due to a color space conversion? I'm puzzled.
>
> Best regards,
> Michael
>

The colors given in my reply to James are calculated from the absorbing 
spectrum of the "real" objects. Note that I do use the same color (and 
not ^3) within the pigment statement and this has influence on the final 
appearance even with ambient and diffuse = 0.

And BTW here are two colors calculated from spectral data of two typical 
diamonds:

Diamond ("natural yellow") : rgb <0.9856, 0.9924, 0.8726>
Diamond ("lemon yellow")   : rgb <0.9909, 0.9697, 0.8961>

-Ive


P.S. sorry for the mail, since T'birds user interface has changed it 
happens to me all the time :(

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