Using a spherical 'density_map' you would just say:
[0.5 rgb 0]
[0.75 rgb 1]
for example to get a outer half of a sphere clear then reach full density
at 3/4 the way in.
Also could use predefined densities in place of the 'rgb' so that
there are differing types for outer and inner.
Just create however many density {density_map}} statements
you need.

Bob

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