Hi Marco, On 11 March 2012 18:13, Marco Fiocco <[email protected]> wrote: > I'm working with OpenSceneGraph 3.0.1 (the latest stable) and Qt. > I have noticed a strange frame rate drop switching from Qt 4.7 to 4.8. With > 4.7.3, the frame rate was maximum 60fps on every computer. With 4.8 the > frame is maximum 38-40fps on every computer. Definitely too much to accept. > I cannot understand why! Is it a bug or what?
I'm not a Qt engineer so can only speculate on what might be the difference. My best guess is that the app your are testing is running a idle or timer callback to run each frame and this is being called less often by Qt 4.8 than Qt 4.7. With real-time apps one should never use a GUI timer or idle callback to instigate frame, rather the application should be frame driven and check for events on each frame. Most osgViewer based apps will be frame driven unless they change the mechanism for calling frame. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
