Thanks Robert, I'll have a look!
robertosfield wrote: > Hi Stirling, > If you need to reject concluded objects then you will need to use the OpenGL > occlusion query feature, see the osgocclusionquery example. > Robert On May 28, 2012 5:17 PM, "Sterling Somers" < ()> wrote: > > Robert, > > > > Thanks for the reply. I would ideally need to reject fully occluded objects > > (but there is a speed tradeoff that I'd consider). When I was thinking > > about doing this with the pickhandler (which might be slow?), I was > > thinking of using a polytope intersection but I had no real reason for > > doing so, other than it seemed appropriate as I could define a region that > > cover the camera (that's what other people seemed to be doing). I could not > > tell you whether ray based intersections would be appropriate or not. > > > > Sterling > > > > > > robertosfield wrote: > > > > > Hi Sterling, > > > > > > How you want to go about the task depends very much of your specific > > > needs. Is it sufficient for the any part of the object to be in the > > > view frustum? Do you need to reject objects that are in the view > > > frustum but wholly occluded by other nearer objects? Is ray based > > > intersections appropriate? A polytope based intersections? > > > > > > Robert. > > > > > > On 14 May 2012 16:43, Sterling Somers <> wrote: > > > > > > > > > > Hi, > > > > > > > > I am fairly new to OSG and have been slowly learning the basics. I am a > > > > student and the basic theme of my research is to model human behaviour. > > > > I have been interested in making our models more interesting by > > > > immersing them into a 3D environment. To give the agent SOME sense of > > > > vision, I’d like to be able detect which objects are viewable to the > > > > (automated, one day) viewer. I do not know much about OSG but this > > > > seems like a plausible project. I suspect I wouldn’t want to do it with > > > > the pickhandler, is that correct? Would I have to do some sort of > > > > culling callback? I have been grasping at straws. Basically, given a > > > > command, I’d like to my program to respond with what objects are > > > > viewable, what it’s coordinates are, and if possible, the file location > > > > for any sub-graphs. If I could get some opinions on whether this would > > > > even be possible, that would be great. Some pointing in the right > > > > direction would be ever greater. > > > > > > > > Thank you! > > > > > > > > > > > > Sterling > > > > > > > > ------------------ > > > > Read this topic online here: > > > > http://forum.openscenegraph.org/viewtopic.php?p=47695#47695 > > > > (http://forum.openscenegraph.org/viewtopic.php?p=47695#47695) > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > osg-users mailing list > > > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > > > > > > > _______________________________________________ > > > osg-users mailing list > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > > ------------------ > > > Post generated by Mail2Forum > > > > > > > > > ------------------ > > Read this topic online here: > > http://forum.openscenegraph.org/viewtopic.php?p=47897#47897 > > (http://forum.openscenegraph.org/viewtopic.php?p=47897#47897) > > > > > > > > > > > > _______________________________________________ > > osg-users mailing list > > () > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > ------------------ > Post generated by Mail2Forum ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=48035#48035 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
