A survey of parametric scattered data fitting using triangular interpolants . curve and surface design , h . hagen ed . , springer - verlag , 1992 2在每條邊界曲線上指定相應(yīng)的二次法向量,其與邊界曲線的切向量相垂直。
By adjusting the given tangent vector , the parametric rational arc spline also has convexity preserving property and monotonicity preserving property 在實(shí)際操作中,通過調(diào)整一側(cè)端點(diǎn)的切向量,可使上述圓弧樣條曲線保凸,保單調(diào)。