Hi Robert, We are testing in release build. And we have the same result on windows and linux. The high cost is a little bit surprising but i didn't have time to investigate further. So, the idea is add a flag on osgTerrain (hum set/getProcessNeigbours maybe?)
Fabien -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: mercredi 6 octobre 2010 14:58 To: OpenSceneGraph Users Subject: Re: [osg-users] Performance problem with osgTerrain Hi Fabien, Such high costs when doing boundary equalization are not good news. Disabling this should be an option, placing this control into osgTerrain::Terrain would be the appropriate thing to do rather than just commenting a code path out in GeometryTechnique.cpp. It would also be good to get to bottom of why the cost is so high. Are you testing in debug build of the OSG? Robert. On Wed, Oct 6, 2010 at 1:47 PM, Fabien Lavignotte <[email protected]> wrote: > Hi, > We uses the last developer version of OpenSceneGraph 2.9.9, with the > last version of VPB. > There is a very important performance problem with terrain generated > by VPB using --terrain, so based on osgTerrain. > The update time takes very long at different intervals (between 8 and > 10 ms, instead of below 1 ms the rest of the time). > As a result, a solid frame rate of 60 Hz cannot be obtained. > After investigation, the reason is the neighbouring computation to in > GeometryTechnique. By just removing it (see file attached), the > performance problem is gone. > I don't really understand why this neighbouring computation is needed, > apparently it is here to be sure that tile border are equals, but i > don't see any problem when commented out. > So, maybe it would be interesting to add an option in order to > desactive the neighbouring computation? > > Cheers, > Fabien > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please visit http://www.messagelabs.com/email > ______________________________________________________________________ > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph. > org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
