Dear Johannes,

If tried this, but unfortunately this didn't help. This is an example
of source code which produces the wrong result:

/* Here it starts

global_settings {
  adc_bailout 0.003922
  ambient_light <1.0,1.0,1.0>
  assumed_gamma 1.9
  hf_gray_16 off
  irid_wavelength <0.247059,0.176471,0.137255>
  max_intersections 64
  max_trace_level 10
  number_of_waves 10
}

background { color <0.000,0.000,0.000> }

atmosphere {
  type 1
  distance     40.0
  color <0.8,0.8,1.0,0.0,1.0>
  scattering   0.3
  samples      5
  jitter       0.0
  aa_threshold 1.0
  aa_level     3
}

camera {
  location  <-12.000, -20.000, 15.000>
  direction <0.0,     0.0,  1.8317>
  sky       <0.0,     0.0,  1.0>
  up        <0.0,     0.0,  1.0>
  right     <1.33333,  0.0,  0.0>
  look_at   <0.000, 0.000, 0.000>
}

light_source {
  <0.000, 0.000, 18.812>
  color  rgb <1.000, 1.000, 1.000>
  spotlight
    point_at  <0.000, 0.000, 17.812>
    falloff   9.22
      radius    4.66
}

#declare Texture =
   texture
   {
      pigment
      {
         color rgbft <1.0, 1.0, 1.0, 1.0, 1.0>
      }
      finish
      {
         ambient 0.0
         diffuse 0.0
         brilliance 0.0
         phong_size 0.0
         roughness 0.0
      }
      halo
      {
         emitting
         linear
         spherical_mapping
         color_map
         {
            [ 0.0     rgbft <1.0, 1.0, 0.0, 0.0, 1.0> ]
            [ 0.088968  rgbft <1.0, 1.0, 0.0, 0.0, 0.0> ]
            [ 0.373665  rgbft <1.0, 0.0, 0.0, 0.0, 0.0> ]
            [ 1.0     rgbft <1.0, 0.0, 0.0, 0.0, 1.0> ]
         }
         turbulence 1.0
         scale  0.5
      }
   }

sphere

  <0,0,0>,1
  texture {
    Texture
  }
  hollow
  scale 2.297393
}

*/ here it ends

If I comment out the atmosphere section, the halo does show up. Maybe
you can find the error in the source code?

Thanks for your help,

Greetings,

Harmen.

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