I made some trials.
You are right with the rough proportionality, if you don't reach memory 
limits.
Surprisingly it takes only 600000 tree copies to reach the limits of my 2 GB 
machine. Why?
If I subtract the base scene file memory need, Povray (v3.5) needs 3 KB per 
tree.
The tree is a mesh2 object with 57000 faces, 23 MB memory need and two 
simple textures.
For a simple pointer 3 KB seems very much.


Norbert Kern

"Christoph Hormann" <chr### [at] gmxde> schrieb im Newsbeitrag 
news:dg0shl$4o6$1@chho.imagico.de...

> Norbert Kern wrote:
>> It's only my experience, that with millions of objects my computer gets 
>> slow even with 2 GB memory.

> What exactly gets slow?  Everything (placing the trees of course, parsing 
> the generated trees, rendering) should be roughly proportional to the 
> number of objects (rendering even faster) as long as you don't exceed 
> memory.

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