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
> >
> >
>
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