在三角网格重建的过程中，平坦区域可以用较少的三角形表示，而曲率较大的地方应该有更多的三角形，本程序删减平坦区域的三角形-triangular mesh in the process of redevelopment, the flat region can use smaller triangles, Curvature and the larger part should be more triangular, the deletion procedures flat triangle reg