Nice try Tom.

Those transmit (and filter, if were used) values are ignored so that can be
removed from the densities.

For pattern type 'boxed' is wrong since halo's cubic followed the spherical
mapping. I think maybe cubic_wave is the way to go then, but I'm not
completely sure if it is the same formula.

camera {location -3*z look_at 0}

sphere { 0, 0.8
  pigment { color rgbt <1, 1, 1, 1> }
  interior{
    media {
      emission 1
      density{
        spherical
        color_map {
          [ 0.0 color rgb <1, 0, 0>  ]
          [ 0.666 color rgb <1, 1, 1> ]
          [ 1   color rgb <1, 1, 1> ]
        }
    cubic_wave
      }
    }
  }
  hollow
  scale 0.5*x+y+z
}

-- 
Bob H.
http://www.3digitaleyes.com

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