Thanks for the comments, but what do you think of the different
reflection?  The previous version should be more realistic in fact, but
i'm not really sure what's better.  

BTW, i forgot to mention that i reduced radiosity recursion_limit from 2
to 1 without much loss in quality (maybe it's even better).  This caused a
major speedup, which of course was compensated by the granite function :-(

I gave up the heightfield brick idea for the moment, because the varying
brick size makes this difficult, but i think about adding some
hierarchical bounding for the single brick rows.  

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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