I have issues with initialization of the osgTrackballManipulator. The
problem appears when using the TaoFramework (coding in C#) so that may
be a factor. Regardless of what initial conditions I specify for the
trackball, the scene starts out witht the eyepoint in the XY-plane
several hundred meters from the origin. Here is the initialization code:
public void InitializeOSG()
{
timerRefresh.Enabled = false;
_timer = new Osg.Timer();
_viewer = new Viewer();
_gw = _viewer.setUpViewerAsEmbeddedInWindow(0, 0, Width,
Height);
// Declare and allocate a trackball manipulator to control
the view
TrackballManipulator l_TrackballManipulator = new
TrackballManipulator();
// Use a quaternion to setup the trackball
l_TrackballManipulator.setCenter(new Osg.Vec3d(0.0, 0.0,
0.0));
Osg.Quat initRotation = new Osg.Quat();
initRotation.makeRotate( DegToRad(45.0), 0.0, 0.0, 1.0 );
// Tried both degrees and radians here... no difference
l_TrackballManipulator.setRotation( initRotation );
// SEEMS TO DO NOTHING
l_TrackballManipulator.setDistance(1.0);
// SEEMS TO DO NOTHING
l_TrackballManipulator.setMinimumZoomScale(0.0); //
Preclude pushing the TO point near the target
// Apply the trackball manipulator to the camera manipulator
_viewer.setCameraManipulator( l_TrackballManipulator);
// Specify single-threaded viewing
_viewer.setThreadingModel(Viewer.ThreadingModel.SingleThreaded);
_viewer.setSceneData(new Osg.Group());
_viewer.realize();
timerRefresh.Enabled = true;
_viewer.frame(_timer.time_s()); //!< Draw one time to kick
out the old OpenGL buffer
// DEBUG: Get trackball manipulators back to see how they
are really set...
Osg.Vec3d center = l_TrackballManipulator.getCenter();
double distance = l_TrackballManipulator.getDistance();
double zoomScale =
l_TrackballManipulator.getMinimumZoomScale();
}
I would welcome any ideas about why this code does not establish the
initial view...
Bob Gallaway
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