Gael Guennebaud 691fb92690 Disable opengl demo if Qt4 or OpenGL cannot be found.
(transplanted from caf24f1c9e540c0d7120d9344a2f4a2fd14098f2
)
2012-10-31 11:36:45 +01:00
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Navigation:
 left button:           rotate around the target
 middle button:         zoom
 left button + ctrl     quake rotate (rotate around camera position)
 middle button + ctrl   walk (progress along camera's z direction)
 left button:           pan (translate in the XY camera's plane)

R : move the camera to initial position
A : start/stop animation
C : clear the animation
G : add a key frame