threed-beam-fea/ext/eigen-3.2.4/demos/opengl/README

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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