Eduard -- I thought you wanted more than just inside/outside the view volume, I thought you wanted occlusion information (object is hidden behind something in the scene).
J-S's suggestion will just tell you whether something is in or out of the view volume, but won't tell you whether or not something is hidden. The way to implement J-S's suggestion (if you want to use it) would be to add a cull callback to the root node of your subgraph, and in that callback, call the osgUtil::CullVisitor::isCulled() method. You pass in the bounding volume and get a true/false return. It would be nice if this mechanism also considered culling due to OcclusionQueryNodes, but it does not at this time. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf > Of Eduard Trulls > Sent: Tuesday, June 10, 2008 11:42 AM > To: OpenSceneGraph Users > Subject: Re: [osg-users] OcclusionQueryNode woes > > Hi, > > I think that's still a bit beyond my osg/gl skills, and more > so given my time frame; hence the convenience of using > library code. (If this feature is already built in, I > couldn't find it, please point!) I'll have a look at it if > this doesn't pan out, anyway. > > Thanks, > E. > > Jean-Sébastien Guay wrote: > > Hello Edward, > > > >>> You can query the test pass/failure results on a per-camera basis. > > (...) > >> Yes, the query works. I was talking about recovering the > pass/failure > >> without acting accordingly (disabling the node if "invisible"), > > > > If all you want is to be able to determine if a node is visible or > > not, can't you just test its bounding volume against the camera's > > frustum? It's not quite trivial, but pretty easy once you > get the hang > > of it. > > > > Come to think of it, there should probably be a class to do this in > > OSG (perhaps osgUtil?) - can't remember if there really is, but if > > not, it would make a useful addition for a number of people I would > > think. > > > > J-S > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-opensce negraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
