The BSplineCurve, describes a general spline curve, using B-spline basis functions, as defined in BSplineMfd. Splines on this form are often referred to as B-splines.
A pth-degree spline curve is defined by
where Pi are the control points., the wi are the weights and the Nip are the pth degree B-spline basis functions defined in the nonperiodic and nonuniform knot vector
