imho ISOsurface is the most flexible and powerfull future in Pov :)

Only disadvantage is it's speed in some cases.
I have idea for a opimization, that in some cases can prove _realy_ fast.

Let's think about iso in shape like :

.....
.   .
..*..
.   .
.....

the '.' border shaphe is quite smooth, and in tha areas max gradient is 
about 0.1
but center '*' shape is very sharpl, and it's max gradient is 50.0

so entire ISO is calculated with gradient 50.0

but if we divide ISO to separate iso's with diffrent max_gradient it will 
ernder much faster. Problem with using i.e. union/merge of smal ISO's is 
that ther will be some artefacts in places where elements touches 
togeather.

I will soon prepare some examples (images+code), ideas how toimplement it, 
and suggested syntax. Do You find this idea interesting ?


-- 
#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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