Hi jean-sébastien, Your explanation is very clear.
My problem is that when I configure my application like that (2 slaves cameras) I have a lot of weird behaviour (some of my models aren't displayed, interraction with mouse and keyboard are odd), so I found a much simple solution wich is to set my own resize callback to my graphic context. In my resize implementation I directly update the projection matrix from the slave camera and I don't update the _projectionOffset wich for me is useless. I still think that future osg version should correct the default resizeimplementation because this behaviour seems very strange to me, maybe am I the only one to think so ;-) 2009/5/15 Jean-Sébastien Guay <[email protected]> > Hi Alexandre, > > something isn't right with the last thing I said, when creating a new >> osgViewer::View a main camera is created by default, so it's not possible to >> have 2 slave cameras only and no main camera, am I right ? >> > > Of course, an osgViewer::View will always have a main camera. This is the > camera that is used for user interaction, etc. But it does not render > anything, only the two slaves have GraphicsContexts attached. Check it out, > try view->getCamera()->getGraphicsContext(), you will get 0, but if you try > it on both slaves you will get a valid GraphicsContext (it could be the same > one). > > So your goal of having only 2 cameras rendering will be met by this setup. > The slave cameras render using view and projection matrix offsets from the > master camera, and user interaction (say using a camera manipulator) moves > the main camera's view matrix and thus affects the slaves indirectly. > > Hope this clears things up, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [email protected] > http://www.cm-labs.com/ > http://whitestar02.webhop.org/ > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- Alexandre AMALRIC Ingénieur R&D =================================== PIXXIM S.A. 73E, rue Perrin-Solliers 13006 Marseille http://www.pixxim.fr
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