It looks indeed a bit strange, but i doubt it is really a matter of the
heightfield resolution, looks more like an accuracy problem of some kind.  

Things that would help:

- does it also occur without 'smooth'?
- a closeup view
- the heightfield code

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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