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left / right arrow keys to rotate view around the x axis
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up / down arrow keys to rotate the view and the y axis
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pgDn / pgUp keys to zoom out and in, respectively
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left-click dragging horizontally will rotate the view around the x axis
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left-click dragging vertically will rotate the view around the y axis
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scrolling in and out will zoom in and out, respectively.
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m will change the projection mode
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0 resets the view