- // Get zero elev
- const SGVec3d& get_zero_elev() {if ( _dirty ) { recalc(); } return _zero_elev; }
- // Get world up vector
- const SGVec3f& get_world_up() {if ( _dirty ) { recalc(); } return _world_up; }
- // Get surface east vector
- const SGVec3f& get_surface_east() { if ( _dirty ) { recalc(); } return _surface_east; }
- // Get surface south vector
- const SGVec3f& get_surface_south() {if ( _dirty ) { recalc(); } return _surface_south; }
-