Not sure if this is much improved, but it is much slower now: about 75
hours.  I think i will try to optimize things like using heightfields for
the upper bricks.  

I dimmed the light a bit, but it turns out to be quite dark now. 
Radiosity quality is even lower than before so the shadow parts look quite
messy.

I really need a faster computer...

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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