运用de Casteljau递归求值法编写三角形域上的n次Bezier曲面计算程序，给定 控制顶点-de Casteljau using recursive method for the preparation of the triangle domain n Bezier surface calculation procedures for determining control vertices

三次TC-Bezier曲线的拼接以及双三次TC-Bezier曲面拼接。-Three TC-Bezier Curves and Bicubic TC-Bezier Surfaces.