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 - toggles between three transforms: model-relative (yaw/pitch/roll-style), world-relative, and camera-relative. W,S - control the outer gimbal. A,D - control the middle gimbal. Q,E - control the inner gimbal. I,K - move the camera up and down, relative to a center point. Holding SHIFT with these keys will move the camera in smaller increments. J,L - move the camera left and right around the center point. Holding SHIFT with these keys will move the camera in smaller increments.
@author integeruser