Hi Jesper,
Jesper D. Thomsen schrieb:
Hi, and thank you.
I naturally tried to use reserve() (but thanks for suggesting it) and this of
course helped somewhat, but it still seems to be the primary bottleneck. I've
changed most of the rest of the per-frame geometry generation code to use
static arrays rather than std::vector and this caused a major speedup (factor
10 or more) of my own part of the code, but I'm still stuck with the push_backs
on osg::DrawElementsUInt.
Maybe there's just no faster way to do it, or maybe I'm just using OSG in a
somewhat un-intended way.
Jesper D. Thomsen
Just some more ideas/comments:
Are you testing a release build? Debug-Verions (especially on Windows)
are known to have dramatically slower implementations.
What profiling tool are you using? Sometimes the output is misleading
and can point you in the wrong direction. As from my experience
push_back() on an pre-reserved() vector should not be a performace issue.
If you can spare the memory you could also try swap(), implementing
your own double-buffering for your osg::DrawElements.
Cheers,
Peter
________________________________________
From: [email protected]
[[email protected]] On Behalf Of Peter Hrenka
[[email protected]]
Sent: Thursday, March 26, 2009 12:00 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Most efficient way to use osg::DrawElementsUInt?
Hi Jesper,
Jesper D. Thomsen schrieb:
Hi all, I'm developing an application where I have to create up to 1000
osg:geometry objects per frame during certain interaction modes.
I'm using osg::DrawElementsUInt push_back() to define the geometry
primitive sets, and this push_back() seems to be the primary bottleneck
for my applications graphical performance. Is there a more efficient way
to define the primitive sets than to fill a osg::DrawElementsUInt by
push_back and add it to the geometry?
This is currently bringing me down to about 1 second per frame, which is
kind of a roadblock.
You can use reserve() to pre-allocate the needed memory.
After that push_back() will not perform any reallocations/copies
until the limit is reached.
regards,
Jesper D. Thomsen
Cheers,
Peter
--
Vorstand/Board of Management:
Dr. Bernd Finkbeiner, Dr. Roland Niemeier,
Dr. Arno Steitz, Dr. Ingrid Zech
Vorsitzender des Aufsichtsrats/
Chairman of the Supervisory Board:
Michel Lepert
Sitz/Registered Office: Tuebingen
Registergericht/Registration Court: Stuttgart
Registernummer/Commercial Register No.: HRB 382196
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
