"Thorsten Froehlich" <tho### [at] trfde> wrote in
news:3dbc3969@news.povray.org 

>> Where can I find detailed explenation of how solver works, best -
>> with some step-by-stem examples how he do it ?
> That won't help you finding the gradient of a function in advance. 

I know, but I'm just interest how does it work :)


-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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