Wasn't it Eric Buddington who wrote:
>I'm trying to model the Earth's atmosphere (as a sphere) using scattering
>media.
>The atmosphere's density follows a e^(height) type function.
>The available wave types don't seem to include this. I've played with
>spherical mapping and poly and cubic wave types,but it's unsatisfactory so
>far.
>
>Is there a way for me to create a radial density pattern of A^Br, where 'r'
>is the radius and A and B are constants?

You can use any function{} as a media density pattern

http://www.econym.demon.co.uk/isotut/patterns.htm#density

You could #include functions.inc and use f_r(x,y,z) as an expression for
r, or you could use pow((x*x+y*y+z*z),0.5).

-- 
Mike Williams
Gentleman of Leisure

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