Clipka gave me these formulas to generate a cylindrical isosurface.

#declare fL = function(x,y,z) {y*100}
#declare fC = function(x,y,z) {sqrt(x*x+z*z)*128}
#declare fH = function(x,y,z) {atan2d(x,z)}

What would be a formula for a sphere? L should be latitude, H longitude, 
and C radius.

Thanks.

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