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Taking all the fun out of do-it-yourself, there's this:
#declare GS=
sphere {0,1 hollow
pigment {rgbf 1}
interior {
media {intervals 12 samples 3,3
emission <.67,.75,.33> absorption <.33,.25,.67>
scattering {4,<.67,.75,.33>} // type 1 is softer, 2-4 tighter and
intense
density {spherical
density_map {
[0 rgb 0]
[.33 rgb .75] // vary index to change sharpness/softness
[1 rgb 1]
}ramp_wave}}
}
}
#declare GlowSpot=
light_source {0,<.67,.75,.33>
looks_like {GS}
fade_distance 1 fade_power 2
}
GlowSpot
camera {location -5*z
look_at 0
}
plane {y,-1.01 pigment {rgb 1}}
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