I've attached a short movie and the scene file. Compare to this for a
general idea of what I'm trying to do:

https://commons.wikimedia.org/wiki/File:HSLSphere.svg

Things I am unsure about:

1. The blue part is the largest. Shouldn't the green part be biggest
    since because are eyes are more sensitive to greens?
2. The blue part sticks out of the sphere a tiny bit. Is the following
    formula appropriate?

     #declare fC = function(x,y,z) {sqrt(x*x+y*y+z*z)*128}

    Isn't the hypotenuse longer than x, y or z by themselves? I mean, if
    X, y or z is no more than 1, shouldn't the radius also be no more
    than 1?
3. The isosurface is awfully flat at the bottom. This makes me
    suspicious.

Mike

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Attachments:
Download 'cielch_color_solid_sphere_isosurface.pov.txt' (11 KB) Download 'cielch_sphere.mp4.mpg' (2671 KB)