I would appreciate your hint which package I really need etc. I have a subscription as WolframAlpha Pro user for the public web interface. Can I use there functions for B-spline primitives, or I need some other package? This gives the description of BSplineCurve as a related wolfram language symbol but it appeares to be impossible (at least, I face this) to use this function directly in the input line. Where am I wrong?
