Hi again, thank you very much for your insight. I have now tried using nodemasks to hide inactive objects by applying nodemasks to their transforms. However, my primary problem remains. I see a massive speedup in general drawing speed, but the picker still finds geodes in empty spots on the screen (always close to actual objects), and when it finds such a geode it causes the multi-second pause. In my previous version this also happened when there were empty branches of the OSG graph with no drawables attached to the geodes, but it didn't happen when everything was visible (even though this meant that the number of objects on screen was a magnitude larger). In my current version, I have the same OSGgraph as in my previous version with all objects visible, but now with nodemasks applied to cut off invisible branches. Could it be possible that I need to call dirtybound() or something like that on the nodes with nodemasks applied to get correct picking? Is there reason to believe that using switch-nodes would yield better results?
Thank you in advance. Jesper D. Thomsen -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: 8. april 2010 11:57 To: OpenSceneGraph Users Subject: Re: [osg-users] Showing and hiding objects by removing/adding drawables. Hi Jesper, Adding/removing node/drawables/stateset from the scene graph is not something I would recommend users do for toggling the visibility of items. The best way is to decorate the subraphs with an osg::Switch node, or use the osg::Node::set/getNodeMask(uint) setting it to 0x0 and 0xffffffff to switch a subgraph off/on. An advantage of NodeMasks is that can also be used in conjunction with the traversal masks, so you could just toggle whether whole groups of geometry/labels get visualized just by switching on different parts of traversal mask on the cull visitor. Robert. On Thu, Apr 8, 2010 at 10:39 AM, Jesper D. Thomsen <[email protected]> wrote: > Hi all, > > > > I'm using OpenSceneGraph to show an interactive modelview for a > muscular-skeletal modeling application. In this view there are a number of > graphical objects which should only be viewed some of the time. I have > attached a screenshot with all such objects of a single category turned on > (the green lines with text attached), but normally only a few would be shown > at a time. I'm currently creating the entire OSG graph for the modelview > window at load, and turn these components on/off by removing and adding > their drawables to the Geodes. Each geode maximally has a few (about 0-5) > drawables, and I have several thousand geodes in total in the OSG graph. So > far, this method of doing show/hide has worked fine, but I'm now doing > picking using both LineSegmentIntersector and PolyTopeIntersector with each > mouse-click in the window (to handle draggable objects), and I'm getting > some pauses when I have a lot of objects hidden (that is, their geodes have > no drawables attached). The pauses happen during the call to accept(picker), > and are 1-5 seconds on a current machine. If I make everything visible (all > geodes have drawables), no pauses occur during picking. My question is if it > discouraged to have lots of geodes with no drawables in them, and would it > be better to also remove the geodes/transforms from their osggroups in the > graph? > > > > I also notice that I'm getting picking hits on visually empty space near the > model from geodes with no drawables attached. I had the impression that the > picker would only give me hits if I clicked a drawable of some sort. Can > this be caused by having removed drawables from geodes, which somehow cache > some kind of hit-box? > > > > On to another matter: In the OSG graph I have a large number (hundreds) of > osgtext objects with identical text textures, but with different positions > (as seen in the attached screenshot). As it is relatively slow to generate > all these identical textures, I would like to reuse the texture for the > osgtext's, but I can't find an example of how to do this. Or can I just have > a single osgtext attached to multiple transforms, and thus do the instancing > that way? > > > > I'm using OSG 2.6.1 and Visual Studio 2005 sp1 on Windows XP/Vista/7 > computers. > > > > If I have been unclear on anything, please ask me to elaborate. > > > > Regards, and thanks in advance for any advice. > > > > Jesper D. Thomsen > > AnyBody Technology A/S > > > > _______________________________________________ > 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
