Hi Kris, Set the DataVariance of the Text object to DYNAMIC, then you'd be able to use all threading models safely, the problem is that you are changing the text at the same time as it's been read by the draw thread.
Robert. On Wed, Aug 19, 2009 at 2:03 PM, Kris Dale<[email protected]> wrote: > Single threading it seems to work. My guess is that the callback is trying > to access jet_yaw and jet_pitch at the same time as they're being updated. > Is there a another way to get around this than single threading it? I know > in Java you can synchronize functions... though I can't really think of a > way to apply that here so I don't know why I bring it up. Hahaha. > > Thanks, > Chris > > > > > J.P. Delport wrote: >> Hi, >> >> some things you could try: >> >> * switch whatever viewer you have to singlethreaded and see if the >> problem persists. E.g. >> >> v.setThreadingModel(osgViewer::Viewer::SingleThreaded); >> >> * make sure the datavariance of the node is set to dynamic, e.g. >> >> ->setDataVariance( osg::Object::DYNAMIC ); >> >> jp >> >> >> >> Kris Dale wrote: >> >> > Morning / afternoon / evening everyone! >> > >> > So I'll try to keep this brief enough to not be a drag to read through but >> > detailed enough to be understandable. :) Here's a rundown of the >> > situation. I've got a HUD with text writing the yaw and pitch of a >> > constantly updating object. The HUD works perfectly when I don't try to >> > update it so I'm 99.9% certain that it's not the problem. That said in >> > programming I've decided only madmen decide in certainties so I'm keeping >> > an open mind. >> > >> > The problem comes in with the update call back I've attached to the Geode >> > that holds the text that's being written to the screen. I've attached the >> > code below, but the basic gist of it goes like this: >> > >> > 1. Convert the node to a geode. >> > 2. Find the drawable attached to the geode named "textOne" >> > 3. Convert the drawable to an osgText::Text object and update the text >> > >> > I get very interesting results from this callback. It will sometimes >> > segfault almost immediately, sometimes run for several seconds without >> > segfaulting, sometimes minutes. And the entire time before it does, the >> > text updates. So it's evidently getting the reference. Is this just some >> > sort of synch issue or something? >> > >> > >> > Code: >> > /*********** HUD CALLBACK **********************/ >> > >> > class updateHUDCallback : public osg::NodeCallback >> > { >> > public: >> > void operator()( osg::Node* node, osg::NodeVisitor* nv ) >> > { >> > // convert the node* to geode* >> > osg::Geode* geode = node->asGeode(); >> > >> > // if we have a valid geode >> > if( geode ){ >> > >> > int max = geode->getNumDrawables(); >> > int i = 0; >> > >> > // while i < # of drawables, search >> > // for the drawable named "textOne" >> > for(int i = 0; i < max; i++){ >> > if( geode->getDrawable(i)->getName() == "textOne" ){ >> > break; >> > } >> > } >> > >> > // if i==max, we either hit the end, >> > // or there were 0 drawables to begin >> > // with. either way return. >> > if ( i == max ) return; >> > >> > // convert the drawable at i to osgText* >> > osgText::Text* text = (osgText::Text*) geode->getDrawable(i); >> > >> > // if we have a valid text* >> > if(text){ >> > std::stringstream ss; >> > ss << "Yaw: " << jet_yaw << "\n" << "Pitch: " << jet_pitch << "\n"; >> > text->setText( ss.str() ); >> > } >> > >> > } // end if(geode) >> > } // end function operator >> > }; // end class >> > >> > >> > >> > >> > I've tried adding try-catch blocks all over the place, but this doesn't >> > seem to do any good. Any suggestions? >> > >> > ------------------ >> > Read this topic online here: >> > http://forum.openscenegraph.org/viewtopic.php?p=16398#16398 >> > >> > >> > >> > >> > >> > _______________________________________________ >> > osg-users mailing list >> > >> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > >> > >> >> -- >> This message is subject to the CSIR's copyright terms and conditions, e-mail >> legal notice, and implemented Open Document Format (ODF) standard. >> The full disclaimer details can be found at >> http://www.csir.co.za/disclaimer.html. >> >> This message has been scanned for viruses and dangerous content by >> MailScanner, >> and is believed to be clean. MailScanner thanks Transtec Computers for >> their support. >> >> _______________________________________________ >> osg-users mailing list >> >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> ------------------ >> Post generated by Mail2Forum > > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=16423#16423 > > > > > > _______________________________________________ > 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
