Yeah, I had the same issue. Everything was working fine one day, and it was broken the next. I was able to convince myself that it happens when the draw stage starts to take a long time. I think I broke it (i.e. I uncovered a pre-existing problem in my code) by adding more stuff to my scene. Depending on the threading model, if the draw stage is long, the other threads start working on the osgText::Text object while the draw stage is still working on it. I'm sure somebody who knows a lot more about how OSG does threading will write back and tell me I'm an idiot, but that's my story and I'm sticking to it ;)
Glad to hear your problem is fixed. -jv From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kim C Bale Sent: Monday, February 25, 2008 10:44 AM To: OpenSceneGraph Users Subject: RE: [osg-users] Updating node position in event handler. Hi justin, Cheers for the heads up but changing the data variance seems to have solved it. It's odd though because it was working fine as it was, but just recently started crashing.. K. ________________________________ From: [EMAIL PROTECTED] on behalf of Vican, Justin E. Sent: Mon 25/02/2008 15:39 To: OpenSceneGraph Users Subject: Re: [osg-users] Updating node position in event handler. I have also noticed problems with updating osgText::Text objects in the wrong stage of traversal. I think this has something to do with threading. Are you crashing in the osgText::Text::computePositions()? I dealt with this issue about 3 months ago, and I was able to resolve it by moving the text string update of my osgText::Text object into a osg::Drawable::UpdateCallback object. I think the crash happens because one thread is updating the text (re-computing glyphs) while another one is trying to render them. ... Robert just beat me to the punch. Running single threaded should also resolve the issue. Hope this Helps, Justin From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kim C Bale Sent: Monday, February 25, 2008 10:29 AM To: OpenSceneGraph Users Subject: RE: [osg-users] Updating node position in event handler. Ah ok, bit of a follow up to that, the crash doesn't occur when updating the position of the slider, but when it updates an osgText::Text object using ->setText(string); It will do it a few times and seems to crash intermittently if I change it too often. Any thoughts? ________________________________ From: [EMAIL PROTECTED] on behalf of Kim C Bale Sent: Mon 25/02/2008 14:53 To: [email protected] Subject: [osg-users] Updating node position in event handler. I have written a small set of user ortho 2d interface classes one of which includes a slider bar control. I detect the intersection with the slider's geometry to check the mouse has a hold of it and then update it's position based on the coordinates I get from the event handlers 'drag' event. The problem is that when I update the positionattitudetransform of the slider geometry with the coordinates of the mouse from the event handler i get a crash. I have a feeling that it is because I am trying to update the position in Drag event during the event traversal. Is it it correct to assume that you should only update transformations, geometry etc when in the update traversal? If so how can I ensure that these changes are made in the update traversal and not in the event loop? My apologies for this rather vague description, hopefully someone will see what I'm getting at. Cheers, Kim.
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