> 
> Now I've tried interior with ior=1, in "media" I used rayleigh scattering with a
> medium blue (rgb 0, 0.5, 1), the density is modified by "spherical", with a density
> map:
> 
> [0 rgb <0,0,1>]
> [0.95 rgb<0, 0.5, 1>]
> [1 rgb<0,0,0>]
> 

The color of your media is easier to control if you set either the scattering
color or color_map entries to grayscale, because the two are multiplied to get
the final density/color.
The sharp border is there because you have your map entries backwards: with
spherical, 1 is at the center and 0 is at the perimeter, whereas you seem to
have assumed the opposite.

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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