Hi Javier Sorry, I see what you're asking now, what you actually want to look at is osgUtil::RenderStage::runCameraSetup
In this function you will see how a cameras BufferAttachment list is used to create relevant fbo etc. The created fbo is stored in the _fbo variable of the RenderStage. I think this stems back to the days of osg using producer as it feels rather like this sort of thing should be happening in the viewer. I think that's why it's quite difficult to follow. What are you trying to achieve with the fbo once you have it? Tom On 14 February 2011 23:30, Javier Taibo <[email protected]> wrote: > Hi Thomas, > > Thanks for the answer, but you didn't really understand what I was asking > for. I know I can use a FBO to do render to texture or to an image or to a > render buffer. The question was if I can have access to the FBO used by the > camera, either by passing a FBO pointer to the camera or getting a pointer > to the FBO of the camera. I have looked for it in the source code, but I > found no way to do it. > > Thanks anyway. I think I will try by adding an FBO to the StateSet of the > part of the scenegraph under the camera. > > > Regards > > > On Mon, Feb 14, 2011 at 4:35 PM, Thomas Hogarth > <[email protected]>wrote: > >> Hi Javier >> >> >> >>Is there any way to explicitly pass an osg::FrameBufferObject to a >> Camera, >> >>so the camera renders into it? >> >> Yes you can use a framebufferobject as a render to texture target, >> checkout the osgprerender example. If you want to use the result of your >> render in your main app i.e. read the pixel info for some sort of gpu >> compute, then you need to use a pbuffer for your main viewer. You set it up >> something like the following >> >> Set pbuffer in the graphics traits (used to create your context) to true >> Set the viewers renderTargetImplementation to FRAME_BUFFER_OBJECT >> Attach an image as the cameras color buffer. >> >> Now when you render the result will end up in the image and could be saved >> to disk if you like. >> >> Hope that helps >> Tom >> >> PS >> Checkout my helper viewer class and check for the _renderOffScreen bits >> >> http://code.google.com/p/hogbox/source/browse/trunk/src/hogbox/HogBoxViewer.cpp >> Around line 305 and 357 >> >> >>> >> > > > -- > Javier Taibo > > >
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