Let's start with a relatively simpler example of converting CIE XYZ to 
sRGB. The following function is copied from here:

https://github.com/THEjoezack/ColorMine/blob/master/ColorMine/ColorSpaces/Conversions/XyzConverter.cs



         internal static IRgb ToColor(IXyz item)
         {
             // (Observer = 2°, Illuminant = D65)
             var x = item.X / 100.0;
             var y = item.Y / 100.0;
             var z = item.Z / 100.0;

             var r = x * 3.2406 + y * -1.5372 + z * -0.4986;
             var g = x * -0.9689 + y * 1.8758 + z * 0.0415;
             var b = x * 0.0557 + y * -0.2040 + z * 1.0570;

             r = r > 0.0031308 ? 1.055 * Math.Pow(r, 1 / 2.4) - 0.055 : 
12.92 * r;
             g = g > 0.0031308 ? 1.055 * Math.Pow(g, 1 / 2.4) - 0.055 : 
12.92 * g;
             b = b > 0.0031308 ? 1.055 * Math.Pow(b, 1 / 2.4) - 0.055 : 
12.92 * b;

             return new Rgb
             {
                 R = ToRgb(r),
                 G = ToRgb(g),
                 B = ToRgb(b)
             };
         }



I think it would be pretty easy to produce a macro that does all of the 
above. But how do I turn that into a POV-Ray function? The function 
needs to work as a color as well as an isosurface I think.

Mike

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