Tor Olav Kristensen wrote:
> 
> But as this shape is symmetric around both
> its x and z axes (as Anton Sherwood mentioned
> too), there should be infinite gradients at
> the opposite pole as well.
> 
> But I have not experienced any problems at
> that pole yet.

Well, there's no guarantee that insufficient max_gradient leads to
artefacts.  

To avoid such problems you could cut off the spirals at some distance to
the poles, it would probably not be very visible and should solve the
problem.

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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