> Hey I might be needing that, have you got a light_source in your scene or
> is the media showing up only with the ambient cylinder?

just radiosity but it looks rubbish at the moment...what follows is not a
full scene but shows you what i've been on about


global_settings {
        max_trace_level 50
    radiosity {
      pretrace_start 0.08
      pretrace_end   0.04
      count 35
      media on

      nearest_count 5
      error_bound 1.8
      recursion_limit 3

      low_error_factor 0.5
      gray_threshold 0.0
      minimum_reuse 0.015
      brightness 10

      adc_bailout 0.01/2
    }
  }



cylinder        {
                <0,0,-10000>,
                <0,0,200000000>,
                2100
                hollow
                texture { pigment { Blue } finish { ambient 0 } }
                }


// Light Source
cylinder {
  <0,0,-1000>,
  <0,0,20000000>,
  20
  texture {
          pigment {
                  gradient z
                  pigment_map     {
                                  [0 White]
                                  [.1 White*.8]
                                  [.9 White*1.2]
                                  [1 White]
                                  }
                                scale 10
                  }
                        finish  {
                                ambient 3
                                }
          }
                }

cylinder        {
                <0,-1000,0>,
                <0,2000000000,0>,
                500
                hollow
                texture {
                        pigment {
                                Clear
                                }
                        finish { ambient 1 }
                        }
                interior{

                        media   {
                                samples 10
                                emission 1
                                density {
                                        cylindrical scale 400
                                        density_map     {
                                                        [0 rgb 0]
                                                        [1 White*.3]
                                                        }
                                        warp { turbulence 10 }
                                        }

                                }

                        media   {
                                absorption .02
                                }
                        }
                rotate <90,0,0>
                }

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