And the color:


// ------------------------------


texture{
    pigment{
        function{f_result(x,y)}
        color_map{
            [0 rgb<0.1,0.1,0.1>]
            [0.4 rgb<0.2,0.2,0.2>]
            [0.6 rgb<0.65,0.45,0.45>]
            [1 rgb<1.0,0.35,0.3>]
        }

    }
    finish{
        ambient 1
        diffuse 0
    }
}

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