Re: [osg-users] Thousands of trees

i made some weeks ago lot of perfomance test with openscenegraph, and
compared it against other scenegraphs. i remarked that openscenegraph
have some troubles with textured billboards. the perf is not very good
with lot of
billboards. so i am very intereset how you solve this problem

thx
adegli

On Tue, 04 Jan 2005 13:29:48 -0600, Dorosky, Christopher G
<christopher.g.dorosky@lmco.com> wrote:
> Investigate:
> Occlusion culling, display listing, LOD-grouping (at a distance, combine
> several close individual trees into one block). Also look at
> billboarding. It will cut the polys in half, at the expense of some
> rotations.
>
> -----Original Message-----
> From: osg-users-bounces@openscenegraph.net
> [mailto:osg-users-bounces@openscenegraph.net] On Behalf Of Oded Argon
> Sent: Tuesday, January 04, 2005 1:08 PM
> To: osg users
> Subject: [osg-users] Thousands of trees
>
> Hi all,
>
> I am trying to figure out the best way to go trying to add a lot
> (~50,000) trees (double quads for example).
> I looked at the osgforest example and read a discussion in the archive
> from about a year ago.
> As far as I understand what I want to do is not to share the geometry in
> order to get rid of the transforms (using the optimizer) but it still
> seems to be a bit too much... trying to increase the tree count to
> 50,000 in osgforest didn't give a lot of hope for getting good frame
> rates.
>
> Is there any thing else I should do trying to get good performance
> rendering that much trees ?
>
> and another question related to this subject.
> When trying not to share the geometry for my trees I should use the
> clone method right ? but which parameters should I give it ?
> I tried deep copy drawables and arrays and that seemed to be OK, but it
> is just a guess... (trying deep copy all for the 50,000 double quad
> trees kind of "killed" my machine consuming more memory than possible...
>
> Thanks for any help and ideas,
> Oded
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Received on Tue Jan 4 23:14:27 2005