ISO 10303-214:2010(E)
A B_spline_surface is a bounded surface that is used to represent a wide variety of sculptured surfaces. With appropriate attribute values it enables to represent single span or spline surfaces of explicit polynomial, rational B\'{e}zier, or B-spline types, such as NURBS. A B_spline_surface is defined in terms of control points, associated basis functions, weights, and knots.
A B_spline_surface is a type of Surface.
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