Hello,
i'm a little bit confused, probably I just did soem very stuid bug, and I'm 
to tired to find it...

My isosurface objects... disapare, where I set unnesesarly too big bounding 
box, like :

isosurface {
  function { x*x + y*y - 1 } 
  contained_by { box { -s, +s } }
  accuracy 0.001   
  max_gradient 4   
}

for s=2.0 everything is o.k.
for s=3.5 cylinder have holes
for s=6.0cynlinder dissapeare totally

why ?

also : .b.images .animation .source*

-- 
#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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