Hi Shuiying, There isn't really anything others can do to help you as you are the one with your code with your particular OSG usage approach, it's really now down to you to work out what is going on with your application. The best thing I can suggest is step through the application with a debugger, perhaps you'll spot something wrong.
Robert. On 29 May 2012 10:53, wang shuiying <[email protected]> wrote: > Hello, Robert > > Sorry for the late response. But I still cannot figure out why the thread > calling "viewNode->accept(IntersectionVisitor)" just stops there without > going any further. I took a look at the source code of "accept()" function > as well as the "frame()" function of viewer, but I didn't find a mutex or > something like that to protect the node from being visited by two > nodevisitors at the same time. In my application, intersectionVisitor will > not change the scene data, only to get intersections. I try to do this > because I need the intersectionVisitor to change matrix and perform > intersection at a higher frequency than the main frame frequency of the > scenedata traversal. Is there any possibility to work this out? > > > Thank you very much in advance! > > Best regards > > Shuiying > > On 04/01/2012 09:05 PM, [email protected] wrote: >> >> Message: 11 >> Date: Sun, 1 Apr 2012 18:44:28 +0100 >> From: Robert Osfield<[email protected]> >> To: OpenSceneGraph Users<[email protected]> >> Subject: Re: [osg-users] Help: intersectionVisitor in a separate >> working thread cannot work when it is to visit a view node >> Message-ID: >> >> <cafn7y+xyjhv90c26hcrng9avdkh0gdujyuo9k6+oh+jjobj...@mail.gmail.com> >> Content-Type: text/plain; charset=ISO-8859-1 >> >> Hi Shuiying, >> >> It's not safe to read for a data structure that is written to be >> another thread. If you scene graph is not changing then it'll be safe >> to traverse multi-threaded without problem but if it's changing you'll >> need to serialize the reading from the writing threads in some manner. >> The normal frame loop that the OSG provides with the update and event >> traversal that can do updates occurring single threaded and before the >> cull and draw traversals start. >> >> Robert. >> >> On 1 April 2012 09:46, wang shuiying<[email protected]> wrote: >>> >>> > Hello, >>> > >>> > In my programme, I have among others a view node and a thread. The >>> > geometries under the view node changes every frame. The thread >>> > controls the >>> > frequency at which an IntersectionVisitor visits the view node. >>> > >>> > However it turns out it doesn't work. When the intersectionVisitor is >>> > ready >>> > to visit the view node, it stops there, without going further. >>> > >>> > If ?the visit of intersectionVisitor is made to be a part of ?the >>> > updatecallback of view node, then it works. >>> > >>> > I wonder if the intersectionVisitor can work separately from the >>> > updatecallback of the node that it visits >>> > >>> > >>> > Thank you very much in advance for any advice! >>> > >>> > Shuiying >>> > _______________________________________________ >>> > 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 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
