At last the flattening algorithm is presented.Compared with the others, this method can easily control the local precision. it is an effective method for developing doubly curved surfaces in CAD/CAGD.

• 该方法中曲面展开的局部精度较易控制，因此较之以前的方法，更能有效地解决CAD/CAGD中曲面展开问题。