#declare EngineHalo =
sphere { 0, 0.8
  pigment { color rgbt <1, 1, 1, 1> }
  halo {
    emitting
    spherical_mapping
    cubic
    color_map {
      [ 0.0 color rgbt <1, 0, 0, 1>  ]
      [ 0.666 color rgbt <1, 1, 1, -1> ]
      [ 1   color rgbt <1, 1, 1, -1> ]
    }
  }
  hollow
  scale 0.5*x+y+z
}

I've been trying to convert some old models but my one attempt at a halo
using media ended up with a weak-looking transparent thing. Could someone
convert this for me? It should be very easy for an expert.

Thanks

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