Hi Mike, I'd recommend setting the master camera's projection matrix so it fills one side of the cube, then have the slave cameras just rotate from this.
Have a look at how the View::setUpViewFor3DSphericalDisplay method is set up. You won't need use render to texture of course or the final slave camera that does the distortion correction. Robert. On 10/19/07, Mike Wozniewski <[EMAIL PROTECTED]> wrote: > Hi All, > > I'm struggling to understand how to properly offset a slave in > osgViewer, and still have the perspectives line up for tiled and > CAVE-like displays. > > For example, I have one OSG window to render the "left corner" of a > CAVE. The window has 2 cameras: The "left" camera has a viewport that > covers the left half of the window and is rotated -90 degrees. The > "center" camera has a viewport that covers the right half of the window > and is not rotated. > > left camera: > viewer.addSlave(camera.get(), pMatrix, > osg::Matrix::rotate(osg::inDegrees(-90), 0,1,0)); > > center camera: > viewer.addSlave(camera.get(), pMatrix, osg::Matrix::()); > > How do I compute the correct pMatrix to ensure that the frustums line up > in a seamless fashion (ie, objects do not disappear or become duplicated)? > > Note that through trial and error, I have found a pMatrix that works: > pMatrix = osg::Matrixd::scale( viewportWidthRatio * traits->width / > 3150, 1, 1 ); > > But I don't understand why I have to scale by 3150? It seems that it's > related to the size of the viewport... so in my case my full window > width is 2048, so I have: 0.5 * 2048 / 3150 = 0.325. Why this value? > > Also, in case it's important, the master camera is attached to a > NodeTrackerManipulator that I define like this: > nodeTracker = new osgGA::NodeTrackerManipulator(); > nodeTracker->setTrackerMode( > osgGA::NodeTrackerManipulator::NODE_CENTER_AND_ROTATION ); > nodeTracker->setRotationMode( > osgGA::NodeTrackerManipulator::ELEVATION_AZIM ); > nodeTracker->setHomePosition(osg::Vec3d(0,0,0), osg::Vec3d(0,1,0), > osg::Vec3d(0,0,1)); > > The other question I have: what if the left view is not rotated, but > planar to the center? ie, the eye looks directly forward through the > center camera, and the left camera shows a translated and thus distorted > view? What is the proper way to set my pMatrix for that? Obviously it's > not just a scaling operation and requires skewing. > > Any insight would be greatly appreciated! > > Thanks in advance, > -Mike Wozniewski > _______________________________________________ > 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
