[osg-users] performance issues with RTT

Viggo Løvli vigigio at hotmail.com
Mon Sep 8 00:03:51 PDT 2008


Good morning,
 
I did some RTT research some weeks ago and found an interesting problem:
 
Running the pre-render OSG example with osg::Camera::RenderTargetImplementation set to osg::Camera::FRAME_BUFFER results in a nice 60 fps on my hardware.
Running the pre-render OSG example with osg::Camera::RenderTargetImplementation set to osg::Camera::FRAME_BUFFER_OBJECT results in a not so nice 30 fps on my hardware.
Please note that the only difference in the two runs is the FRAME_BUFFER vs FRAME_BUFFER_OBJECT setting.
 
My own RTT application suffer from the exact same problem (complexity of my scene has no impact on this problem).
 
I am at some point in time, going to test this problem with different kinds of hardware and drivers, just to see if this is a driver/hardware problem. Robert told me he had seen no such loss in framerate on Mac and Unix. I am running Windows.
I have seen a very similar problem when working on Direct-X earlier, so I believe this is a driver or hardware issue, but I do not know for sure yet.
 
Regards,
Viggo
> Date: Sun, 7 Sep 2008 09:27:03 +0200> From: mailto.stk at web.de> To: osg-users at lists.openscenegraph.org> Subject: Re: [osg-users] performance issues with RTT> > Good morning,> > I'm just rendering to texture, no images or pixel reading involved.> > Regards,> Steffen> ________________________________________________________________________> Schon gehört? Bei WEB.DE gibt' s viele kostenlose Spiele:> http://games.entertainment.web.de/de/entertainment/games/free/index.html> > _______________________________________________> osg-users mailing list> osg-users at lists.openscenegraph.org> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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