Re: [osg-users] run-on-demand

Paul Gotzel Wed, 14 Apr 2010 06:21:49 -0700

Robert,

Are you referring to a vsync option on my graphics card? I'm running Linux and I have an option called Sync to VBlank. Checking or unchecking this option has no effect. I also run develop other OpenGL applications without this problem so I doubt it is a graphics card setting.

I'm running the distributed 2.9.7 (debug) version of the osgviewer with the following command:

$ osgviewerd --run-on-demand cow.osg

I also saw this with 2.8.2. I don't rotate the view or move the mouse. Any thoughts? I'll try to debug it to see what logic is actually using CPU.

Thanks,
Paul

Robert Osfield wrote:

Hi Paul,

On Tue, Apr 13, 2010 at 10:46 PM, Paul Gotzel
<[email protected]> wrote:

Something I've noticed since I started using osg is that the viewer uses all
of one cpu even when the view is not changing.


Do you have vsync off?  If so enable it right away.  You should only
ever have vsync off if you are doing very specific types of
benchmarking.  Vsync off wastes energy and ruins visual quality.

I've tried passing the
--run-on-demand option to osgviewer and  doing
viewer.setRunFrameScheme(osgViewer::ViewerBase::ON_DEMAND); in code and
there is no difference.  What gives?


On demand rendering checks to see if the the scene graph needs
updating, if it does it lets the frame go ahead.  Perhaps you have
something that animates in your scene.

Robert.
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Re: [osg-users] run-on-demand

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