This class is the fundamental subclass of Time_Object for time-dependent surfaces. Time_Object uses almost the same structure for the geometries as Time_Curve (see 7.4.2), the only difference is that the objects of the TimeSteps in the Chain sequences are of class Geom2d.
Class Surface should be used as an ``abstract class'': it provides much functionality for subclasses, but there are no description files for Surface itself and no "compute-send" method to compute any data.
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