[osg-users] Is it possible to get OpenGL calls as output from OSG?
Hi guys, I have what may be a little bit of an unusual question regarding usage of OpenSceneGraph. In our application we use OSG for drawing views of a dynamically created and animated model, which has so far worked out very well for us. We are now in the situation where we would like to be able to interface with various CAD packages and be able to show our model inside them. A number of CAD packages support this by allowing plugins to render OpenGL calls within the host CAD programs viewports (so that the viewport can contain the combined contents of the plugin drawing and elements from the host CAD program). I am wondering if I can somehow use our existing setup for generating these OpenGL calls directly from OSG. Would it somehow be possible to draw to a kind of OpenGL call buffer rather than directly to a drawing context from OpenSceneGraph. I guess that there's no code in OSG which can do this directly, but I was thinking that it might be possible to create a substitution for GraphicsWindow32 where I could catch the OpenGL calls being generated, and then transfer them to a plugin in the CAD program from there. I do however see some possible issues where OSG is aware of the exact stage of the OpenGL setup, and I would somehow have to flush this when generating the OpenGL call stack. Regards, and thanks in advance. Jesper D. Thomsen AnyBody Technology ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Is it possible to get OpenGL calls as output from OSG?
On Mon, Jan 30, 2012 at 2:48 PM, Jesper D. Thomsen j...@anybodytech.com wrote: Hi guys, I have what may be a little bit of an unusual question regarding usage of OpenSceneGraph. In our application we use OSG for drawing views of a dynamically created and animated model, which has so far worked out very well for us. We are now in the situation where we would like to be able to interface with various CAD packages and be able to show our model inside them. A number of CAD packages support this by allowing plugins to render OpenGL calls within the host CAD programs viewports (so that the viewport can contain the combined contents of the plugin drawing and elements from the host CAD program). I am wondering if I can somehow use our existing setup for generating these OpenGL calls directly from OSG. Would it somehow be possible to “draw” to a kind of OpenGL call buffer rather than directly to a drawing context from OpenSceneGraph. I guess that there’s no code in OSG which can do this directly, but I was thinking that it might be possible to create a substitution for GraphicsWindow32 where I could catch the OpenGL calls being generated, and then transfer them to a plugin in the CAD program from there. OSG makes OpenGL calls ;-) The issue is running OSG in a situation where it is not in control of creating and managing the graphics context. To get started, take a look at the examples like osgviewerSDL that set up the viewer as an embedded window. I do however see some possible issues where OSG is aware of the exact stage of the OpenGL setup, and I would somehow have to flush this when generating the OpenGL call stack. Yes, that is the issue. It can be done with some careful use of callbacks in the scene graph. In your situation, you need to be careful to be in the expected state when OSG rendering starts, and leave it in the state expected by the CAD program when OSG finishes up. Tim Regards, and thanks in advance. Jesper D. Thomsen AnyBody Technology ___ 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] Is it possible to get OpenGL calls as output from OSG?
Hi it is possible to achieve this in following way: render to FBO camera on provided by CAD context ( set main camera as FBO ), get texture ( there are ways to make it clean, but I just stole texture id from within inside OSG ) and apply it onto OpenGL quad I achieved rendering in Blender with OSG, but so that it worked I used only one threaded model. Regards Sergey ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Is it possible to get OpenGL calls as output from OSG?
On 1/30/2012 7:49 AM, Sergey Kurdakov wrote: render to FBO camera on provided by CAD context ( set main camera as FBO ), get texture ( there are ways to make it clean, but I just stole texture id from within inside OSG ) and apply it onto OpenGL quad I achieved rendering in Blender with OSG, but so that it worked I used only one threaded model. I've done this too, only using a context cloned and shared from the original one provided by the host app. Then you just rasterize OSG's texture within the host app. Regards Sergey -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
