Hi Justin, I've written a lot about threading models over the past six months, and the how DataVariance is used to avoid crash overlapping overlaps. So it'd be worthing doing a search back through the archives.
I believe Paul might have mentioned it in the the Quick Start Guide. Robert. On Mon, Feb 25, 2008 at 3:55 PM, Vican, Justin E. <[EMAIL PROTECTED]> wrote: > > > > > 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. > _______________________________________________ > 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
