keyboard usage for rotations

The cursor keys may be used for rotations when the ROTATE mode is on, which might be useful for MAC users. Note that you may have to click on the display area first to give it the keyboard focus (that it may react on keyboard events)

mode: ROTATE
[SHIFT + any cursor keys]
rotation about x-axis (screen normal)
[up / down cursor key]
rotation about y-axis (horizontal axis)
[left / right cursor key]
rotation about z-axis (vertical axis)


mode: auto rotate
stop animation