1
2Navigation:
3 left button:           rotate around the target
4 middle button:         zoom
5 left button + ctrl     quake rotate (rotate around camera position)
6 middle button + ctrl   walk (progress along camera's z direction)
7 left button:           pan (translate in the XY camera's plane)
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9R : move the camera to initial position
10A : start/stop animation
11C : clear the animation
12G : add a key frame
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