Hi Paul, I'm not really sure what clarification you're after. With the OSG, in principle you only ever have access to the graphics context during the draw traversal, this doesn't matter whether your using SceneView, osgProducer or osgViewer.
Now, you can break this principle if you know that you have a context current, but its not something I have ever encouraged, and wouldn't do now. In the case of osgProducer in 1.2 and even now the rendering is done from a thread that call cull-draw in series, and as consequence cull will have the context current. Also when users have used SceneView typically the app is single threaded so again context is current all the time, update, cull and draw. In osgViewer its more flexible, it can do : SingleThreaded - all traversals will have context current, but the context will change if you have multiple windows. CullDrawThreadPerContext - each context has a thread, which call cull and draw in series (a bit like Producer's ThreadPerCamera when one it has one Camera or Context), so you could in theory play fast and loose with do thread ops in cull. DrawTheadPerContext - main thread does all camera culls, draw threads are all done in their own separate contexts. Its not safe to any graphics calls in cull. CullThreadPerCameraDrawThreadPerContext - cull have their own threads without contexts current, draws are all done on the graphics threads. Its not safe to any graphics calls in cull. Robert. On 6/5/07, Paul Martz <[EMAIL PROTECTED]> wrote:
Hi Robert -- I'm running into an issue with my occlusion query work, which again appears to be an incorrect assumption on my part regarding when a rendering context is current. I don't recall seeing any documentation on this subject, so I was hoping you could shed some light on it. It'd be very interesting to see a summary from you about access to the current rendering context under osgProducer in v1.2, and how that has now changed under osgViewer in v2.0. (I'm assuming for a SceneView-based app, that access to the current context is entirely under application control? Correct me if I'm wrong, been a while since I went down that path.) Thanks in advance for the clarification. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com 303 859 9466 _______________________________________________ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
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