You guys are all so helpful.  This is my third question.  Thanks everyone.

#declare halo = object {
   // yadda yadda shapes yadda yadda lathes
   // something like conically shapped, but not really
    media {
       emission light_clr
       density {
          cylindrical scale 0.75
       }
    }
}


That's _almost_ what I want.  Actually I want for the media to be the
precise shape of the halo object in question... which is closer to conically
shaped that cylindrical.  Actualy, I misspoke.  The media is the precise
shape of the halo, the density falls off cylindrically though...

How can I make the emission falloff as I move away from the y-axis, in the
shape of the halo object instead of cylindrically?

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