http://wiki.flightgear.org/Building_FlightGear_with_osgEarth...
https://www.youtube.com/watch?v=oe0kHoEtvYA
http://wiki.flightgear.org/Building_FlightGear_with_osgEarth...
https://www.youtube.com/watch?v=oe0kHoEtvYA