Hi Chris, If you want to clear the depth buffer then you need to use a separate RenderStage rather than just a RenderBin. A RenderStage is a special RenderBin that adds the frame buffer clear prior to its traversal, and any copy to image/texture operations after traversal. By default the OSG has one RenderStage per Camera. So your case you'll want an extra Camera above the subgraph you want the clear. You may place this Camera in the scene graph or in the viewer. See the osghud example.
Robert. On Thu, Oct 23, 2008 at 2:30 PM, Chris Denham <[EMAIL PROTECTED]> wrote: > Hi Robert, > Excellent! That was too easy ;-) so I have a secondary question. > Is there a way to get it clear the depth buffer between renderbins so I can > render with depth test on? The manipulator geometry does not render > correctly over itself with the depth test switched off. > Cheers. > Chris. > >> Date: Thu, 23 Oct 2008 11:24:07 +0100 >> From: "Robert Osfield" <[EMAIL PROTECTED]> >> Subject: Re: [osg-users] The best way to make some object in a scene >> render after and infront everything else. >> To: "OpenSceneGraph Users" <[email protected]> >> Message-ID: >> <[EMAIL PROTECTED]> >> Content-Type: text/plain; charset=ISO-8859-1 >> >> Hi Chris, >> >> You can achieve this affect several ways but the simplicist would >> probably be to state the RenderBin number of the subgraph that you >> want o overlay to a high figures, something like 11 or more to draw >> after the default transparent bin, then disable the depth test so the >> all fragments of the dragger are drawn. >> >> Robert. >> >> On Thu, Oct 23, 2008 at 10:39 AM, Chris Denham <[EMAIL PROTECTED]> >> wrote: >>> >>> I am trying to acheive an effect whereby some geometry in a scene is >>> rendered after and in front of everything else. >>> What I want to be able to do is show an osgManipulator::Dragger node >>> attached to an object in a scene, but show it infront of everything, I >>> guess >>> a bit like a HUD, but where only the Dragger is rendered on the HUD. >>> For anyone that has used Maya, the effect I want is similar to the >>> translation/rotation/scaling manipulators, i.e. where they can be used >>> and >>> seen regardless of what objects that would normally be obscuring them. >>> What's the best way to implement that? >>> The most obvious way seemed to me to create a HUD style postrender camera >>> to >>> render the manipulator on top of the normally rendered scene. But I'm not >>> 100% sure how to get it to only render the manipulator in the scene. Do I >>> need to use nodemasks, or do I need to move the manipulator into an empty >>> HUD scene along with its local to world transform? >>> Neither method seemed very elegant to me, so just wondering if anyone's >>> got >>> a better idea. >>> Chris D. >>> _______________________________________________ >>> 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
