There are two ways to present a surface for the purpose of visualization and co mputation.One is to use analytical surface patches via functions(i.e. contin uous surface).

• 计算机曲面描述通常采用两种方法:用数学函数曲面表示方法(即连续曲面)和用离散的数据点与相应点间的拓扑关系表示曲面(即网格曲面)。