> That said, can anyone help me with converting the following code? Thanks!
>
One way to convert an old 3.5 halo is to break the single
halo statment into three media statments, with each of
the medias representing a single RGB color.

So...

halo
{
 cubic
 max_value 3 spherical_mapping glowing
 colour_map {[0 color rgbt <1,0,0,1>][1 color rgbt <1,1,0,0>]}
}

becomes something like...

   material {
      texture {
         pigment {Clear}
      }
      interior {
         media {
            emission <1,0,0>
            density {
               spherical
               color_map {
                  [0 rgb 0]
                  [1 rgb 1]
               }
            }
         }
         media {
            emission <0,1,0>
            density {
               spherical
               color_map {
                  [0.0 rgb 0]
                  [0.25 rgb 0]
                  [0.5 rgb 0.1]
                  [1.0 rgb 1]
               }
            }
         }
// blue media left off because it's all zero
      }
   }

Note the uneven density of the green, this is because the
falloff of green values is not linear in the halo, it's a
combination of color fade and transparency fade.
To get a good result you need to experiment with the
density maps, it's not an exact match.

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