private void Track(Point currentPosition)
{
Vector3D currentPosition3D = currentPosition.ProjectToTrackball(
_viewport.ActualWidth, _viewport.ActualHeight);
Vector3D axis = Vector3D.CrossProduct(_previousPosition3D, currentPosition3D);
double angle = Ext3D.AngleBetween(_previousPosition3D, currentPosition3D);
axis = Ext3D.Transform(axis, _cameraRotate);
Methods.RotateCameraResult rcr = _camera.RotateCamera(axis, -angle);
_cameraRotate *= rcr.RotateMatrix;
_viewMatrix = rcr.ViewMatrix;
OnLayoutUpdated();
_previousPosition3D = currentPosition3D;
}
void ResetCamera()
{
_cameraZ = _cameraNear; _cameraMove = 0;
_camera.Position = new Point3D(0, 0, _cameraNear); //60
_camera.LookDirection = new Vector3D(0, 0, -1);
_camera.UpDirection = new Vector3D(0, 1, 0);
_camera.FieldOfView = 80;
Matrix3D vm = Matrix3D.Identity;
_cameraRotate = _camera.RotateCamera(new Vector3D(0, 1, 0), Math.PI / 6).RotateMatrix;
Vector3D axis = new Vector3D(1, 0, 0); axis = Ext3D.Transform(axis, _cameraRotate);
Methods.RotateCameraResult rcr = _camera.RotateCamera(axis, -Math.PI / 6);
_cameraRotate *= rcr.RotateMatrix;
_viewMatrix = rcr.ViewMatrix;
}