- bool _reverse_view_offset;
-
- // view position in opengl world coordinates (this is the
- // abs_view_pos translated to scenery.center)
- sgVec3 _view_pos;
-
- // cartesion coordinates of current lon/lat if at sea level
- // translated to scenery.center
- sgVec3 _zero_elev;
-
- // surface vector heading south
- sgVec3 _surface_south;
-
- // surface vector heading east (used to unambiguously align sky
- // with sun)
- sgVec3 _surface_east;
-
- // world up vector (normal to the plane tangent to the earth's
- // surface at the spot we are directly above
- sgVec3 _world_up;
-
- // up vector for the view (usually point straight up through the
- // top of the aircraft
- sgVec3 _view_up;
-
- // sg versions of our friendly matrices
- sgMat4 VIEW, UP;
- sgMat4 LOCAL, ATLOCAL, TRANS, LARC_TO_SSG;
-
- // Transformation matrix for the view direction offset relative to
- // the AIRCRAFT matrix
- sgMat4 VIEW_OFFSET;
-