Hi The OSG does not really support (by design) the idea of asynchronous updating of the SceneGraph like that found Vega/Vega-Prime or good old Performer it was decided that the penalty paid for asynchronous updating was not wanted ( it was very handy though )
So at some point you have to serialize the App thread or Update callback when you want to modify the SceneGraph. Now if all you want to do is load a 3d model and merge that when loaded you can spawn the actual loading off into a worker thread and then when the model is fully loaded only serialize the App thread when you add the model to the SceneGraph If you are making live edits to the SceneGraph for something like a CLOD, then those updates typically will have to be serialized for every time you want to change There are several ways to make this work but it all depends on what you are trying to do to the SceneGraph and the frequency change ____________________________________________________________________________ __ Gordon Tomlinson gor...@gordontomlinson.com www.photographybyGordon.com www.vis-sim.com www.gordontomlinson.com IM: gordon3db...@3dscenegraph.com ____________________________________________________________________________ __ -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Jimmy Lin Sent: Tuesday, June 01, 2010 12:47 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Modifying scenegraph and update Hi, On relative issue. What if viewer->frame() is running on different thread that is different to the thread that modifies the scene graph. In that case I don't really have the control when is frame() get called. the modification can happen during the rendering time, which I guess is bad. I tried use lock/unlock wrap around frame() and where ever I modify the scene, but this introduce serious performance issue. The only solution I can think of is use UpdateCallback. but wouldn't the same problem happens when modify the update callback at the same time as frame() doing the updatetraversal? or does OSG have a way to protect the data during the updatetraversal ?? Or is there other approach you can advice me. Thank you! Cheers, Jimmy ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=28388#28388 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
