...to make use of more advanced raytracing techniques such as media - 
and may have to content myself for the rest of my life with beginner's 
scenes!

I'm still not able to produce planetary rings through which light is 
scattered also to the unlit side... here is the code (no, it's just a 
test scene, not a real Saturn!), and below two scenes showing the lit 
and unlit side of the rings!

// beginning of code

global_settings
{
   max_trace_level 10
}

union
{
   sphere
   {
     0, 1
     texture
     {
       pigment { color rgb <0.6, 0.4, 0> }
       finish { ambient 0.02 diffuse 1 brilliance 0.8 }
     }
   }
   difference
   {
     cylinder
     {
       <0, -0.001, 0>, <0, 0.005, 0>, 3.68
     }
     cylinder
     {
       <0, -0.0011, 0>, <0, 0.0011, 0>, 1.75
     }
     hollow
     pigment { rgbt 1 }
     interior
     {
       media
       {
         emission 1/36800
         scattering
         {
           1, 1
           // eccentricity -0.4
           extinction 1
         }
         density
         {
           cylindrical
           color_map
           {
             [0 rgbf <1, 0.8, 0.7, 0.2> ]
             [0.1 rgbf <1, 0.8, 0.7, 0.2> ]
             [0.1 rgbf <0.1, 0.3, 0.1, 0.5>]
             [0.17 rgbf <0.1, 0.3, 0.1, 0.5>]
             [0.17 rgbf <0.85, 0.89, 0.94, 0.3>]
             [0.18 rgbf <0.85, 0.89, 0.94, 0.3>]
             [0.18 rgbf <0.99, 0.93, 0.45, 0.4>]
             [0.26 rgbf <0.99, 0.93, 0.45, 0.4>]
             [0.26 rgbf <0.5, 0.23, 0.61, 0.5, 0.4>]
             [0.36 rgbf <0.5, 0.23, 0.61, 0.5, 0.4>]
             [0.36 rgbf <1, 0.92, 0.93, 0.3>]
             [0.45 rgbf <1, 0.92, 0.93, 0.3>]
             [0.45 rgbf <0, 0, 0, 1>]

           }
           scale 3.68
         }
       }
     }
   }
   rotate <2, 7, 0>
   scale 10000
   translate z*50000
}


light_source
{
   <500000, 2500, 5000>
   color rgb 1
}

camera
{
   location <1.5, 1.5, 0.12>
   look_at 1.5
   angle 60
}

// end of code

See you in Khyberspace! (learning Pashto seems to be easier than using 
media!)

Yadgar

Now playing: Yesterday Once More (Carpenters)

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