Hi Robert In your QT viewer example you have 5 statics scenes. A single viewer shows a single object and never changes: you update the widgets using a QTimer.
Now, I have a dynamic system where the scene graph changes continuously and there is OsgOcean. I think that the QT problem is the next: If I change the scene graph tree when QT updates the viewer QGLWidget (paintGL() calls a new frame()), there is a race condition. The chain is: 1. I make osg tree scene changes. 2. I call the QWidget::update() which call the relative paintGL() slot. 3. paintGL() slot call the osg frame(). This slot (paintGL()) is asynchronous (means we have no garantees when the paintGL() comes...), so I can return to change the osg scene tree again even if the frame() (an "old" frame() call) is still in execution. I have tried to use a mutex but without luck at now. The crash report is next: Code: 0x00007ffff06e1e5a in osg::Group::traverse(osg::NodeVisitor&) () from /usr/local/lib/libosg.so.80 (gdb) bt #0 0x00007ffff06e1e5a in osg::Group::traverse(osg::NodeVisitor&) () from /usr/local/lib/libosg.so.80 #1 0x00007ffff211858c in osg::Group::accept(osg::NodeVisitor&) () from /usr/local/lib/libosgOcean.so #2 0x00007fffef94f962 in osgViewer::Viewer::updateTraversal() () from /usr/local/lib/libosgViewer.so.80 #3 0x00007fffef958f62 in osgViewer::ViewerBase::frame(double) () from /usr/local/lib/libosgViewer.so.80 #4 0x00007ffff5d37633 in GfxViewer::paintGL() () from /usr/local/lib/libSimViewer.so #5 0x00007fffefe3b450 in QGLWidget::glDraw() () from /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4 #6 0x00007fffefe3ade9 in QGLWidget::paintEvent(QPaintEvent*) () from /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4 #7 0x00007ffff6e3a802 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #8 0x00007fffefe3cc38 in QGLWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4 #9 0x00007ffff6deae9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #10 0x00007ffff6def30a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #11 0x00007ffff68c656e in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #12 0x00007ffff6e36524 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #13 0x00007ffff6fff68c in QWidgetPrivate::repaint_sys(QRegion const&) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #14 0x00007ffff6e2b794 in QWidgetPrivate::syncBackingStore() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #15 0x00007ffff6e3ae4c in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #16 0x00007fffefe3cc38 in QGLWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4 #17 0x00007ffff6deae9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #18 0x00007ffff6def30a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #19 0x00007ffff68c656e in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #20 0x00007ffff68ca3f1 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #21 0x00007ffff68f4a63 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #22 0x00007ffff3e62ab5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #23 0x00007ffff3e62de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #24 0x00007ffff3e62ea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #25 0x00007ffff68f4bf6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #26 0x00007ffff6e8fc1e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #27 0x00007ffff68c52bf in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #28 0x00007ffff68c5548 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #29 0x00007ffff68ca708 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 You can suggest to me some example to look, using QTViewer and dynamics scenes? Thank you! Cheers, Dario ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54965#54965 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
