On Mon, Jun 11, 2012 at 12:31 PM, Gianluca Natale <nat...@europe.altair.com> wrote: > What I would do in standard OpenGL is this: > 1) Draw your whole model first (with depth test enabled); > 2) Clean the depth buffer only (glClear(GL_DEPTH_BUFFER_BIT);); > 3) Draw the dragger (with depth test enabled). > In this way the dragger would always appear on top of the model, no matter > its position in the world. Yes > > How can you achieve this in a scene graph using OSG? > 1) I would set the rendering bin for the whole model to the lowest value, to > force it to be drawn first. Keeping depth test enabled during drawing. ... A less intrusive way to do this is with slave cameras. The main scene is drawn in a slave. Another slave camera draws your dragger by having it as its child. Its clear mask is set to GL_DEPTH_BUFFER_BIT.
Tim > 2) I would define a CleanDrawable, derived from osg::drawable, whose > drawImplementation is just a glClear(GL_DEPTH_BUFFER_BIT). And assign the > rendering bin for such drawable to a value > greater than the one assign to the whole model. Then, I would attach a > geode containing such drawable somewhere in your scenegraph. > 3) I would set for the dragger a rendering bin even greater than that > assigned to the CleanDrawable. Keeping the depth test enabled in this case > also. > > I did do it in my application and it seems to work. But I don't know if there > is a better and more elegant solution. > Just my 2 cents. > > -----Messaggio originale----- > Da: osg-users-boun...@lists.openscenegraph.org > [mailto:osg-users-boun...@lists.openscenegraph.org] Per conto di Bob Slobodan > Inviato: lunedì 11 giugno 2012 10:15 > A: osg-users@lists.openscenegraph.org > Oggetto: Re: [osg-users] Depth test and RenderBin details > > Hi guys, > First of all, thank you for the answers. Unfortunately, I couldn't solve my > problem. I already tried the first solution that consisted in giving > different render bin to the axis and the sphere, but then I either have the > sphere always on top of the axis, or the axis always on top of the sphere. > > This image illustrates my problem : > > [Image: http://img15.hostingpics.net/pics/490598Sanstitre4.png ] > (http://www.hostingpics.net/viewer.php?id=490598Sanstitre4.png) > > The image 1 illustrates what i have when the sphere has a lower render bin > than the axis. The images 2 and 3 illustrates the opposite. > The image 4 illustrates a shading problem that I have in both situation. > > So what I want is a mix between the image 2 and 5. This is basically what I > have when I don't deactivate the depth test and don't use render bin details. > But then, if I have anything (like a plane for example) between my dragger > and the camera, I won't see it anymore. > > Thank you so much for helping me. > > Cheers, > Bob > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=48156#48156 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
