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What you're doing is mixing a filter pigment with your media.
Make the spheres of the tail (the container for the media fully transparent.
Then to avoid the coincident surface problem, scale the spheres a little smaller
then the comet sphere.
sphere{ <0,0,0>,0.27 pigment{rgb <1,0,0>}}
#declare Nr = 1;
#while (Nr>0)
sphere{ <0,0,0>,0.26 pigment{rgbt <1,1,1,1>}
hollow
interior{
media{
scattering{Nr,<1,1,1>}
intervals 3
samples 1,1
}
}
translate <Nr,0,0>
}
#declare Nr = Nr - 0.1;
#end
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