1) Hermite Curve display a Hermite curve.
2) Bezier Curve display a Bezier curve. Note: A Cubic bezier curve is displayed. If you modify the knot vector, or add points, you must reselect this option.
3) Uniform Knots (Floating Ends) display a B-Spline curve with floating end conditions
4) Uniform Knots (Open Ends) display a B-Spline curve with open end conditions
5) Random Non-Uniform Knots display a B-Spline curve with randomly chosen knots.
6) Show Rational B-Spline display a Rational B-Spline curve.