Project from 'Computer Graphics' by Prof.Kwon in '19 Hanyang University
"Never stop mooing until you reach your goal"
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Implements the UI for control point specification
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Implements vertical dragging (L-drag) as well as horizontal dragging (mouse-move)
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Use the cyclic Catmull-Rom spline curve which is an interpolating spline
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Cow should face forward (yaw orientation)
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Cow should face upward when going up (pitch orientation)
