Christoph wrote:
>Marc-Hendrik Bremer wrote:
>> Wouldn't it be good to mention "accuracy" in this VFAQ-Answer, too?
>
>For what reason? I don't remember many people having problems with 
>that, and the meaning is pretty self explanatory.

There is a plobrem on "accuracy" if the thickness of the isosurface 
is thinner than the accuracy value.  For example, following isosurface 
will generate artifacts(artefacts). 

isosurface {
        function {-0.002+abs(-3.0+f_r(x,y,z))}
        contained_by { sphere { 0, 3.1 } } 
        accuracy 0.01                      
}

Thus if the isosurface has a fine-structure, the "accuracy" value 
should be less than the size of the fine-structure.

R. Suzuki

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