I been thinking about a Media density function, but I'm not clever enough to 
know how to do it but I think it should be possible.

Similar to cylindrical function but travelling down the zero axis in all 
three (or is it 6) directions passing through <0,0,0> Density 1 on the axis 
and fading to 0 up to one unit from any of the axis.

Can anyone do that? ( I'm not clever enough )

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