Hi, It seems that if function values get very close to 0 - rendering slows 
down terrible, ie :

function {    
  -min(0.0   ,(
     5-sqrt( pow(x-10,2)+pow(y+10,2)+pow(z+10,2) )
  ))

renders about x5 slower then witout this "min" (it is not needed here, but 
I will need it when functino become more complcated)

and :

function {    
  -min(0.0001,(
     5-sqrt( pow(x-10,2)+pow(y+10,2)+pow(z+10,2) )
  ))

products artefacts, even if max_gradient is o.k.

how can I solve it ?

-- 
#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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