Justin, I tried the exact same thing as this, but I did a setPostDrawCallback instead of setFinalDrawCallback. Do you think that could make the difference? We are doing all sorts of things with OSG that might interfere. John
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vican, Justin E. Sent: Wednesday, June 18, 2008 4:06 PM To: OpenSceneGraph Users Subject: Re: [osg-users] osgViewer Custom Graphics Operations Hi John, I don't know what else you are trying to do, but as far as screen capturing goes, it is supported by the composite viewer. It is not explicitly supported by the osgViewer:CompositeViewer class, but it can be done through a derived osg::Camera::DrawCallback. The callback can be added to each osg::Camera in the osgViewer::CompositeViewer through the osg::Camera::setFinalDrawCallback() method. Hope this helps, Justin From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Argentieri, John-P63223 Sent: Wednesday, June 18, 2008 3:37 PM To: [EMAIL PROTECTED] Subject: [osg-users] osgViewer Custom Graphics Operations Robert/OSG, What is the plan for OSG to grant us the ability to insert custom graphics operations in a controlled order? What I mean is, what if we want to process our own application-level callbacks immediately after makeCurrent() and immediately before swapBuffers() using osgViewer::CompositeViewer? There are too many things that we can't do using osgViewer::CompositeViewer and Camera/Cull callbacks. osgViewer::CompositeViewer doesn't permit us to do image->readPixels in order to do a screen capture. I've read all your advice on the topic in this forum. It just doesn't work. We have to roll our own render loop to the point that I never even call renderTraversals(). I made my own method that substitutes that method. Of course, I don't have access to the barriers, so my viewer must be single threaded. John Argentieri
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