HI Frank, This is what you using a PixelBuffer for :-) See the osgscreencapture for an example, in particular the --pbuffer-only path.
Robert On Wed, Aug 31, 2011 at 10:34 PM, Frank Sullivan <[email protected]> wrote: > Greetings, everyone. > > Is there any way to get OSG into a state where it renders everything to an > offscreen FBO? In addition to this, I would need to suppress any sort of > window creation or rendering to a back buffer. > > That's my basic question, but here's a little background just in case. What I > am basically trying to do is create an OSG-based C++ library that will: > > a) Create a render context without launching a window. > b) Draw a scene graph to an off-screen buffer. > c) Read the pixel data back into system memory. > d) Marshal that data into WPF code. > e) Paint a WPF control with this image. > > I know that this is bound to be slow, but frame rate is not important for > this application. I already have d & e working, using a set of dummy pixel > data defined in the C++ library. I just need to figure out how to get OSG to > render to an off-screen buffer without launching a window, and then how to > get it to do some sort of glReadPixels-type thing in order to get the result > into system memory. > > So far, I've just been using osgViewer::Viewer for everything, but I'm > guessing that option is out and that I'll have to do something more manual. > > Thanks! > Frank > > P.S. I am aware that there are other ways of getting OSG to draw to a WPF > control. For instance, I tried using a WinFormsHost in order to stick a > WinForms panel into my application. This gives me an HWND that I can pass to > OSG so that it will draw directly to the control. I have tried this approach, > however in doing so, I have run into some so-called "airspace" issues that > are tricky to solve. I have tried a couple of the approaches that I found on > the web for working around this, and none of them are optimal. So, I am > giving this method a try, wherein I draw to an off-screen FBO and then read > the pixel data back, and pass it to WPF. > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=42347#42347 > > > > > > _______________________________________________ > 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
