This 
                    2D Placement
                    Define a placement in 2D space
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                     type enables to define perspectives for two different positions,
        and then to interpolate between, and even beyond, those two positions.
        This is particularly useful in order to video-map moving panels, see 
                    Use posital values into Smode
                    The good process for using Posital values in Smode
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                    .