in news:5c569fc3$1@news.povray.org Thomas de Groot wrote:

> http://news.povray.org/povray.binaries.images/attachment/%3Cweb.4ac2c5
> 52a7005b411322341f0@news.povray.org%3E/landscapetutorial.pov.txt 
> 

Interesting.
There once was an include file for realistic sky/(fog?) based on media 
that had proper absortion depending on the suns angle. Can't find it :(

Regarding tree placement, it would be nice if we could use voronoi 
(crackle) some howe to determine how big the crown of a tree can be before 
intersecting with the surrounding ones.  
The centre of the cell would be the trunk. The size of the cell the crown 
and the height of the tree.

http://math.lbl.gov/voro++/examples/ for inspiration,

ingo

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