Then a high - degree geometric continuity blending surface is obtained with transfinite interpolate method . ( e ) g3 blending surface with approximation can be constructed by lofting if geometric invariant errors are given , the surface can be converted to b - spline , nurbs form for the purpose of system aggregation 最后,為滿足曲面造型系統(tǒng)集成的需要,在保證曲率、曲率導(dǎo)數(shù)和撓率精度情況下,將上述研究結(jié)果應(yīng)用于曲面放樣逼近方法,得到參數(shù)過渡曲面轉(zhuǎn)換成b樣條曲面或nurbs曲面的形式。