I have liked the fade_power option in glows, and a simple modification
of the macro accomodates this. Excellent idea Warp.

MJL

#macro Glow(GlowColor, Fade_Power, Scale)
  sphere
  { 0, 1 hollow no_shadow
    pigment { rgbt 1 }
    interior
    { media
      { emission 1/Scale
        density
        { spherical poly_wave Fade_Power density_map
          { [0 rgb 0][1 rgb GlowColor]
          }
        }
        samples 1,1 intervals 1 confidence .1 // quite fast settings
        method 3
      }
    }
    scale Scale
  }
#end

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