OcclusionQueryNode (OQN) has changed significantly since I contributed to this effort, so I can only provide general advice.
OQN issues occlusion queries to OpenGL, and to avoid stalling the pipe, waits until the Camera's post-draw callback to retrieve the query results. Then it uses those results to determine what is visible in the next frame. RetrieveQueriesCallback is the post-draw callback that is used to retrieve the queries. For some reason, your Camera doesn't have such a callback attached. I'd suggest searching the OSG source to see where RetrieveQueriesCallback is attached to the Camera. I believe OQN was originally written to perform this task automatically. It is also possible that you have attached some other Camera post-draw callback. If so, you would need to take steps to ensure that both callbacks are being executed. On Wed, Aug 7, 2013 at 4:07 PM, Zach Basanese <[email protected]>wrote: > Hello and thank you for any help in advance, > > I am working with some code that a coworker had created, but is > unavailable at the moment. It deals with Occlusion Query Nodes. > When we were still in OSG version 2.8, my coworker had grabbed a lot of > the methods from the 3.0 version's OcclusionQueryNode.cpp and put them in > our code so that we could use them for our sun. However, now that we have > transitioned to 3.0, the code that was brought in isn't being used anymore, > defaulting to OSG's code. > The issue is, whenever our sun is on screen, we are getting the following > error now: "osgOQ: QG: Invalid RQCB." > This apparenlty happens becaues of this area of code: > > Code: > > RetrieveQueriesCallback* rqcb = dynamic_cast< > RetrieveQueriesCallback* >( cam->getPostDrawCallback() ); > if (!rqcb) > { > OSG_FATAL << "osgOQ: QG: Invalid RQCB." << std::endl; > return; > } > > > > I think it might be that we aren't setting up the nodes correctly, but I > haven't been able to find any examples or documentation related to this > error or how to properly set up occlusion query nodes in OSG. > Any help is appreciated, please let me know if you have any questions > regarding my question. > > Zach[/code] > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=55804#55804 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- Paul Martz Skew Matrix Software LLC
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