On 11/28/2016 6:42 PM, Mike Horvath wrote:
> 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.

Would I use atan(x,y) for L? This produces values between -90..90 
degrees, correct? Or should it be atan(z,y)?

Thanks.

Mike

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