Norbert Kern wrote:
> 
> Christoph, what is a hierarchical grouping?
> You mentioned this in your "water tunnel final" thread and I am very
> interested but unsuspecting.

If you group the trees with union{} in a tree-like structure this can
speed up things a lot.  For example combine two trees standing near to
each other and combine two of these 'doubles' and so on.  If the trees are
placed in a (more or less) regular grid, a recursive macro would be best
for that, otherwise things can be more difficult.  

I'm not sure how much can be gained in this case, so maybe it's not worth
the efforts.

> 
> I tried radiosity my second version and the most simple settings. Rendering
> time increased by a factor of twenty without any visible advantage.
> I will try a fill light as you suggest.
> 

Adding radiosity and no visible effect - very strange.  For experiments i
would use a 'light' version without the grass and reflections and only a
few trees BTW.  

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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