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On 11/29/2016 7:54 AM, Bald Eagle wrote:
> Mike Horvath <mik### [at] gmail com> wrote:
>
>> What would be a formula for a sphere?
>
> I always start here:
>
> http://www.econym.demon.co.uk/isotut/
>
> whenever I have any questions about isosurfaces.
That tutorial only gives a single function for a sphere. I need separate
functions for latitude, longitude and radius, that get combined later
using an additional function.
Like this:
#declare fD = function(C) {abs(C-0.5)-0.5}
#declare fDist = function(Dr,Dg,Db) {max(Dr,Dg,Db)}
#declare fR = function(L,C,H) {convertLCH2RGBa1(L,C,H)}
#declare fG = function(L,C,H) {convertLCH2RGBa2(L,C,H)}
#declare fB = function(L,C,H) {convertLCH2RGBa3(L,C,H)}
#declare fL = function(x,y,z) {90+atand(x/y)} // wrong!
#declare fC = function(x,y,z) {sqrt(x*x+z*z)*128}
#declare fH = function(x,y,z) {atan2d(x,z)}
#declare fFinal = function(L,C,H)
{
fDist
(
fD(fR(L,C,H)),
fD(fG(L,C,H)),
fD(fB(L,C,H))
)
}
Mike
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