On 12/1/2016 6:41 PM, Alain wrote:
> Le 16-11-28 à 18:42, Mike Horvath a écrit :
>> 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.
>
> When I want a isosurface sphere, I use the following:
>
> #include "functions.inc"
>
> Then, I use the f_sphere(x,y,z,radius) function that use an internal
> function. Faster and simple.
>
> If you want the function to use in an isosurface, it's
> sqrt(pow(x,2)+pow(y,2)+pow(z,2))-Radius to be used with a threshold of
> zero.
> Also, you can use sqrt(pow(x,2)+pow(y,2)+pow(z,2)) and use the threshold
> to controll the radius.
>
> Using 3 functions is if you want to make a parametric sphere. It's not
> the same thing.
>
>
> Alain

I don't want a sphere. I want an irregular shape in a spherical 
coordinate system.

Mike

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