"R. Suzuki" wrote:
> 
> 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.
> 

Yes, it seems quite natural, same happens when tesselating such
isosurfaces.  I think there is nothing you can do about it.

BTW, you can create nice moire-like patterns with that method. :-)

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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