Mmmm. Okay, that was it, I tried that before but I didn't set it directly to
the text, I set it on the Geode I had attached the Text too.. my apologies.
OSG is still a relatively new thing to me, as is graphics programming in
general. :)
Thanks for all of your help, that seemed to fix it!
Chris
robertosfield wrote:
> 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<> 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
> > > >
> > > >
> > > >
> > > >
> > > >
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