Ive <ive### [at] lilysoftorg> wrote:
> #macro M_Gem (Color, IOR, FadeDist)
>    material {
>      texture {
>        pigment {rgb Color filter 1}
>        finish {
>          ambient 0  emission 0  diffuse 0
>          reflection {0 1 fresnel on} conserve_energy
>        }
>      }
>      interior {
>        ior IOR
>        fade_power 1001
>        fade_distance FadeDist
>        fade_power rgb < pow(Color.red,3),
>                         pow(Color.green,3)
>                         pow(Color.blue,3) >
>      }
>    }
>
> #end
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

Post a reply to this message