You can either use a true orthographic projection, or you can set the TrackballManipulator home position so that the viewpoint is further away. If you are really trying to create a "near orthographic" (but not a true orthographic) projection, then setting the eye distance very far away is the right approach.
At my former employer, we used to set the FOV to about 10 degrees to mimic the angle actually subtended by our render window on the screen. (10 degrees is not as extreme as what you're doing, but it's still pretty extreme compared to most 3D apps, and approaches orthographic.) But then we needed to see an entire aircraft in that window, so we had to set the viewpoint quite far away to get the entire aircraft into that 10 degree field. You'll need to do the same. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tomas Hnilica Sent: Friday, March 27, 2009 5:19 AM To: OpenSceneGraph Users Subject: [osg-users] setProjectionMatrix and FOV Hello osg users, I am trying to set the camera perspective projection to 'near' orthogonal. I achieve desired projection by setting the FOV to some low number (1.0). When the projection matrix is changed in this way, the scene is 'zoomed-in'. This means, that MatrixManipulator::home does also zoom-in and the scene does not fit to the view (using TrackBallManipulator). It is clear what happens, but how can I prevent the 'zooming' in the best way? I could apply some scaling factor to the MatrixManipulator, but this seems to me not a clean solution... many thanks, Tomas _______________________________________________ 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
