b.com/integeruser/jgltut for info, updates and license terms.
Part II. Positioning Chapter 8. Getting Oriented http://www.arcsynthesis.org/gltut/Positioning/Tutorial%2008.html
SPACE - toggle drawing the gimbal rings. W,S - control the outer gimbal. A,D - control the middle gimbal. Q,E - control the inner gimbal.
@author integeruser