编写了一个B样条曲线，对机械加工等专业的同学关于复杂曲面加工很有帮助,The preparation of a B-spline curves, the mechanical processing and other professional students on complex surface machining helpful

B样条曲线的7个控制点的双三次B样条曲面算法-Seven control points of bicubic B-spline surface algorithm