The center isn't stored in the matrix, of course. Once the matrix is constructed, the center could be any random point along the view direction vector. You'll need to specify an eye distance, or scale the value yourself. -Paul
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Renan Mendes Sent: Monday, October 27, 2008 7:46 AM To: OSG Mailing List Subject: [osg-users] setViewMatrixAsLook at and getViewMatrixAsLookAt Hi, I am using these two methods: setViewMatrixAsLookAt(eye, center, up) and getViewMatrixAsLookAt(&eye, ¢er, &up) with the viewer's camera in this order and WITHOUT manipulating the camera elsewhere in my code. I don't have much experience with OSG but isn't the last method supposed to return in the eye, center and up objects the same parameters that I have used to set the view matrix before? I've made a simple test: viewer.getCamera()->setViewMatrixAsLookAt(osg::Vec3f(10., -10., 2.), osg::Vec3f(0., 0., 0.), osg::Z_AXIS); osg::Vec3f eye; osg::Vec3f center; osg::Vec3f up; viewer.getCamera()->getViewMatrixAsLookAt(eye, center, up); cout << "eye " << eye.x() << " " << eye.y() << " " << eye.z() << endl; cout << "center " << center.x() << " " << center.y() << " " << center.z() << endl; cout << "up " << up.x() << " " << up.y() << " " << up.z() << endl; And what I've got from the cout's was: eye: 10 -10 2 (OK) center: 9.29986 -9.29986 1.85997 up: -0.0990148 0.0990148 0.990148 What am I doing wrong here? Did I misunderstand the purpose of the method? Renan M Z Mendes
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