I can't get the example in the docs to work, or the candle flame example from F.
Lohmueller's site.  I've probably tried 5 others.

I've been at this for hours, and I'm done searching and testing.

I'm clearly missing something.
[0 rgb 0] wipes out the sphere completely - no color, no "light"
THAT drove me crazy for most of the time.
Commenting that out finally gave me a semitransparent sphere of the next color
in the map.  Adding absorbing media just makes it look more solid.
I don't get any sort of transparent glowing effect like shown in the examples
for this copy-and pasted code.  The first is from the docs, the second is from
F. Lohmueller's candle flame example.

Why?



box {<-300, 0, 100>, <300, 400, 101> pigment {Gray50}}
//sphere {<0, 0, 0> 100 pigment {rgbf <0.6, 0, 0, 0.9>} translate y*270}
//light_source {<0, 270, 10> color rgb <1, 1, 1>}


/*
sphere {<0, 270, 0>, 100
 pigment {rgbt 1} hollow
 interior {
  media {
   emission 1
   //intervals 3
   //samples 1, 1
   density {spherical
    density_map {
     //[0 rgb 0]
     [0.0 rgb <1,0,0>]
     [0.8 rgb <1,1,0>]
     [1 rgbf 1]
     }  // end density map
    }  // end density block
   }  // end media block
  //media {absorption 0.2}
  }  // end interior
 }  // end sphere
*/


sphere {<0, 270, 0>, 100 hollow
 pigment {color rgbf <1, 1, 1, 1>}
 finish { ambient 0 diffuse 0 }
 interior {
  media {
   emission color rgb<1.0,0.75,0.1>*1.75
   intervals 9
   samples 1, 20
   confidence 0.9999
   variance 1/100
   density {spherical
    ramp_wave
    turbulence 0.15
    color_map {
     //[0.0 color rgb <0.0,0.0,0.0>]
     [0.6 color rgb <0.8,0.3,0.0>]
     [0.9 color rgb <1.0,0.8,0.3>]
     [1.0 color rgb <1.0,1.0,0.1>]
     }  //  end color_map
    scale <1,2.5,1>
    }  //  end of density
   }  //  end of media
  }  // end interior
 }  //  end sphere

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