Hi all, I forgot to mention in my long-winded post that I'm using OSG 2.8.0.
chuck > -----Original Message----- > From: [email protected] [mailto:osg-users- > [email protected]] On Behalf Of Cole, Charles E. (LARC- > B702)[RAYTHEON TECHNICAL SERVICES COMPANY] > Sent: Friday, March 27, 2009 12:51 PM > To: OpenSceneGraph Users > Subject: [osg-users] Problems shutting down Composite > Viewer/View/Custom drawables > > Hi all, > > I've been chasing an error in my code for many, many days that I'm > hoping that someone can help me track down. I'll try to explain my > application as best I can. > > I'm using a composite viewer to load multiple views. In each view, I'm > loading a database scene (generally a TXP database) and overlaying > OpenGL nodes that I load dynamically and add as drawables to the > scenegraph. I've created classes to encapsulate the composite viewer, > view, and scene nodes. For instance, I have a class that contains a > composite viewer member variable; this class then creates multiple > "View" classes that each contain an osgViewer::View member variable. > Each view then loads scene nodes as specified in a configuration file. > These nodes are contained in separate libraries and are loaded as > drawables (I've created a class derived from osg::Drawable and > overwrite the drawImplementation method for custom drawing). > Everything works great when creating the viewer, view, nodes, and even > executing. The problem comes when I try to destroy/close the window. > > My attempted process to close is that I (1) set a flag on a render > thread to stop calling viewer->frame (very similar to setDone(true)); > (2) destroy the loaded drawables and free their associated libraries; > (3) destroy the view, and thus it's associated camera and graphics > context; and (4) destroy the composite viewer. I use reference > pointers in every case except for the composite viewer (although I've > tried a reference pointer for it as well, but still get the same > result). > > When trying to follow the above process, the application crashes in the > Node::releaseGLObjects method at line 523, if (_updateCallback.valid()) > _updateCallback.releaseGLObjects(state). > > I also noticed during a debug walkthrough that the drawables > drawImplementation method (and thus the custom drawable's own custom > drawing methods) are still being called after the render thread has > been stopped and destroyed. > > So, some of my many questions are: > > (1) Is there a preferred/required means or order for shutting down a > composite viewer (and it's child nodes)? > > (2) Separately, but possibly related ... I create a camera callback > function to update the camera position per shared memory variables. > I'd like to destroy that callback function appropriately. But, in > doing so, how do I reset the camera's callback function such that it's > not called once the custom callback function is destroyed? > > (3) What's the appropriate means of stopping the rendering? I thought > that if viewer->frame() wasn't getting called, the drawImplementation > method of the drawables would no longer be called, so I could then free > those libraries. But, unfortunately, they're still being called even > though frame() is no longer called. And thus, the libraries are trying > to be freed when the viewer is still trying to draw them. > > I am running multithreaded. I'm using VS 2008 SP1 on Windows XP and > Vista. > > If anyone has any tips, pointers, something to point me in the right > direction before I end up throwing the computer through the window, I'd > greatly appreciate it. I hope I've provided enough information. > > Thanks so much in advance. > > Chuck > > _______________________________________________ > 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
