Am 28.10.2011 13:45, schrieb [GDS|Entropy]:
> I do not understand why the position of this object controls its appearance.
> Any clues?

Yes: You failed to translate the sperical pattern to the desired position.

I suggest to compose the Glow thing at <0,0,0>, and finally translate it 
to where you want it:

> #macro Glow(glowPosition, glowRadius, glowColor)
> light_source
> {
>      glowPosition
replace this line with:
        <0,0,0>

>      color rgb glowColor
>      looks_like
>      {
>          sphere
>          {
>              glowPosition, glowRadius
replace this line with:
                <0,0,0>, glowRadius

>              hollow
>              pigment
>              {
>                  rgbt<0, 0, 0, 1>
>              }
>              interior
>              {
>                  media
>                  {
>                      intervals 1 //  scale this ...
>                      samples 1, 1
>                      emission glowColor
>                      density
>                      {
>                          spherical
>                          scale 3
>                          density_map
>                          {
>                              [0.0 rgb glowColor * 0.000]
>                              [0.8 rgb glowColor * 0.250]
>                              [0.9 rgb glowColor * 0.750]
>                              [1.0 rgb glowColor * 1.000]
>                          }
>                      }
>                      density
>                      {
>                          spherical
>                          density_map
>                          {
>                              [0.00 color rgb glowColor * 0.000]
>                              [ 0.90
>                                  granite
>                                  color_map
>                                  {
>                                      [0 color rgb glowColor * 0.750]
>                                      [1 color rgb glowColor * 0.250]
>                                  }
>                                  //BlackHoleWarp(4, 1, 1, glowPosition, 1)
remove this line (or keep it commented out)

>                              ]
>                              [1.00 color rgb glowColor * 1.500]
>                          }
>                      }
>                  }
>              }
>              finish
>              {
>                  reflection 0
>                  diffuse 0
>                  ambient 0
>                  phong 0
>                  specular 0
>                  brilliance 0
>              }
>          }
>      }

insert here:
        translate glowPosition

> }
> #end

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