The horizontal location of an origin relative to an object, e.g., a 
    
    
    
    
    
    
    
    
    
    
    
    
Billboard.
For example, the horizontal origin is used to display a billboard to the left or right (in
screen space) of the actual position.
    Members
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    The origin is at the horizontal center of the object.
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    The origin is on the left side of the object.
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    The origin is on the right side of the object.
