GM_BSplineCurve : Public abstract Interface
A Bspline (Figure 19) is a piecewise parametric polynomial or rational curve described in terms of control points and basis functions. If the weights in the knots are equal then it is a polynomial spline. If not, then it is a rational function spline. If the Boolean "isPolynomial" is set to TRUE then the weights shall all be set to 1. A Bspline curve is a piecewise Bézier curve if it is quasiuniform except that the interior knots have multiplicity "degree" rather than having multiplicity one. In this subtype the knot spacing shall be 1.0, starting at 0.0. A piecewise Bézier curve that has only two knots, 0.0, and 1.0, each of multiplicity (degree+1), is equivalent to a simple Bézier curve.<br/>
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