Media densities are specified by the color_map, not by the pattern. The 
default color_map goes from black to white, you need to change it if you 
want a larger range.
I don't know if the function pattern values are still clipped...you may 
just be able to specify a color_map using values outside the [0, 1] 
range, like:

color_map {
    [0 rgb 0]
    [10 rgb 10]
}

If not, you will need to scale the function value down to the [0, 1] 
range and specify a brighter color in the color_map.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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