Hi Glenn, I haven't seen problems with multiple RTT Camera's unintentionally sharing their attachments, use of multiple RTT Camera's is pretty common so I would have thought that others would have seen the same problem. The best I can suggest to step through the traversal of CullVisitor::apply(Camera&) to see what the flow of control is doing and what data is it applying.
Robert. On 21 February 2013 01:22, Glenn Waldron <[email protected]> wrote: > Hi folks. I'm stumped by an RTT problem and looking for help! > > I have two RTT cameras that share the same subgraph. My goal is to render > the subgraph with two different projection matrices (not unlike in the PSSM > example). But I'm having a weird problem. > > Each RTT camera is created separately, and each bound to its own Texture2D. > Otherwise they are identical, and they share no data. Then in the CULL > traversal I do this: > > cam1->setViewMatrix( viewMatrix ); > cam1->setProjectionMatrix( projMatrix1); > cam1->accept( nv ); > > cam2->setViewMatrix( viewMatrix ); > cam2->setProjectionMatrix( projMatrix2 ); > cam2->accept( nv ); > > The problem: both cameras render to the SAME texture (the texture attached > to cam1), one right over top of the other. I confirmed this by attaching an > osg::Image and writing it to disk. > > If I traverse just ONE of the cameras, everything works correctly. But if I > traverse them both (as in the snippet above), both cameras render to the > FIRST camera's texture. If I reverse the order of traversal, both cameras > render to cam2's texture. (As I said, each camera was created separately and > each has its own Texture2D instance.) > > Any ideas? What's my mistake? > > > Glenn Waldron / @glennwaldron > > _______________________________________________ > 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
