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Returns the new head angle
Could be use the determine absolute direction (North, Soth , West, East ...)
examples:
0 means look forward into the screen (in the opposite direction of the world X axis)
90 means look left (in the opposite direction of the world Y axis)
-90 or 270 means look right (in the direction of the world Y axis)
180 means camera looking from the screen out (in the direction of the world X axis)
Adding or subtracting 360*n to the angle has no influence on the result
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