Defines curves as constraints to be used to deform a surface Allows you to set the order of continuity required for the constraints: G0, G1, and G2, controlled respectively by G0Criterion G1Criterion and G2Criterion. Returns the order of constraint, one of G0, G1 or G2 Returns the G0 criterion at the parametric point U on the curve. This is the greatest distance allowed between the constraint and the target surface at U. Returns the G1 criterion at the parametric point U on the curve. This is the greatest angle allowed between the constraint and the target surface at U. Raises an exception if the curve is not on a surface. Returns the G2 criterion at the parametric point U on the curve. This is the greatest difference in curvature allowed between the constraint and the target surface at U. Raises an exception if the curve is not on a surface. Allows you to set the G0 criterion. This is the law defining the greatest distance allowed between the constraint and the target surface for each point of the constraint. If this criterion is not set, TolDist, the distance tolerance from the constructor, is used. Allows you to set the G1 criterion. This is the law defining the greatest angle allowed between the constraint and the target surface. If this criterion is not set, TolAng, the angular tolerance from the constructor, is used. Raises an exception if the curve is not on a surface The number of points on the curve used as a constraint. The default setting is 10. This parameter affects computation time, which increases by the cube of the number of points.