On 04/18/2011 11:02 PM, awestover wrote:
> Maybe I'm not fully understanding photons and the light source, this is my first
> pov ray program.
>
> What I came up with after your post was
>
> global_settings{
>      photons{
>          spacing 0.05 autostop 0
>      }
> }
>
> light_source {
>      <-5, -3, -8>
>      color rgb<1, 1, 1>
>      translate<-5, 5, -5>
>      spotlight
>      point_at<0,0,0>
>      radius 10
>      photons {
>         refraction on
>         reflection on
>      }
>
> }
>
>
> camera {
>      location<-15,10,-40>
>      look_at<3,-2,0>
>      angle 60
> }
>
> difference {
>      box {
>          <-4,-2,-8>,<4,2,8>
>      }
>      plane {
>          <0,-1,0>,-1 rotate<0,0,60>
>      }
>      plane {
>          <0,-1,0>,-1 rotate<0,0,-60>
>      }
>      hollow on
>      pigment {
>          color rgbt<.8,1,.9,.7>
>      }
>      finish{
>          reflection{
>              0.01 1 fresnel
>          }
>          conserve_energy
>      }
>      interior {
>          ior 1.5 dispersion 1.03
>          dispersion_samples 12
>      }
>      photons{
>          target refraction on reflection on
>      }
> }
>
> This makes a good triangular prism and the photons make it look good, but there
> is still no visible light entering the prism/rainbow exiting. Am I doing
> something wrong with the light source?
>
>
>
>
The simple media tutorial beginning here:
http://wiki.povray.org/content/Documentation:Tutorial_Section_3.6#Simple_Media_Tutorial

will get you going with the media that you need to make the light 
visible ;-)

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