Hi David, The osgviewer run as you describe, 60 htz etch and I can also see the tearing problem. (Quadro NVS 295) I thinks it's a Qt related problem: I use the viewerQT / adapterWidget from the osg exemple, so The paint event is call by a Qtimer and force OSG to run in singleThread mode. I dont know how call the swap buffer from different thread, by using a osg::Thread or a Qthread ? How can i call the SwapBuffer with OSG ?
Thanks ! Le lundi 19 octobre 2009 à 09:24 -0500, David Fries a écrit : > On Mon, Oct 19, 2009 at 11:29:32AM +0000, Linares Antonin wrote: > > Hi, > > > > I actually use 2 osg::viewer embedded in a Qt window, when i enable the > > sync to vblanc in nvidia-setting my 2 viewers work's to 30 fps while my > > refresh rate is 60 htz. (and 3 viewers work's to 20fps ...) > > Did anybody already experiment this issue ? > > Maybe it's a driver bug, i use osg 2.8.0 with nvidia 180.29 under linux > > RHEL 5. > > > > Thanks you all. > > What if you run > osgviewer cessna.osg > one, two, or three times? I would expect the same 60Hz, 30Hz, 20Hz. > In my experience it is graphics card and driver dependent. I'm > running an nVidia Quadro FX 3700 with driver 185.18.14 and the > multiple osgviewers will each run at 60Hz, but beyond one it isn't > always vertical synced as I can see tearing. > > I'm guessing the logic, but it seems that swap buffers doesn't return > until the swap happens, or the swap happend for the previous swap > buffers on that context. You could try multithreading your swap > buffers calls, that way all threads are waiting for the swap to happen > instead of one thread serially waiting on each context to swap. > -- --- Linares Antonin ONERA - DCSD _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
