Thanks for the clarification, Robert! My viewers are running in SingleThreaded mode, so I should be OK, but it is definitely something to keep in mind.
Cheers, Morne On Wed, Jan 21, 2009 at 1:01 PM, Robert Osfield <[email protected]> wrote: > Hi Morne, > > You can modify the scene graph in the event traversal, just like you > can with the update traversal. The only thing you need to be careful > about is that if you are modifying StateSet (and its contents) and > Drawables and their a rendering threads that are using these still > running - this only happens for the DrawThreadPerContext and > CullThreadPerCameraDrawThreadPerContext threading models. The way to > avoid the main thread doing the updates and the rendering thread(s) > for overlapping is to make the StateSet and Drawable with a > DataVariance of DYNAMIC. > > Robert. > > On Wed, Jan 21, 2009 at 12:41 PM, Morné Pistorius > <[email protected]> wrote: >> Hi all, >> >> I used to work under the rule of thumb to only ever modify my scene >> using update callbacks, but scanning the lists I found reference >> saying that modification anywhere outside the viewer.RenderTraversal() >> is safe. I just want to verify this: directly modifying my scene >> graph in an eventhandler should be safe, right? And this should still >> be safe if my scene is shared between multiple views (as in a >> composite viewer), but not if my scene is shared between more than one >> viewer window (assuming my viewers are created with a QGLWidget, >> instead of a QWidget in which case it will be safe again). I call >> viewer.frame() on a QTimer evnet as in the OSG QtViewer examples. >> >> Have I got that right? >> >> Thanks! >> >> Morne >> _______________________________________________ >> 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 > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
