I've developed a small and quite nice app that visualizes B-Spline support functions. You can move knots so that the B-Spline adjusts automatically and see how it behaves on non uniform knots, and turn on and off important features like Bezier polygon, de Boor points. The application has been written in Direct2D which was discussed later. Numerically stable and correct algorithms have been implemented to evaluate B-Spline function.
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