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" <[email protected]> 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 > > > > > > > > > > > > > > > > > > _______________________________________________ > > > osg-users mailing list > > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > _______________________________________________ > > osg-users mailing list > > > > > 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 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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