Doo-Sabin细分算法，利用de-boor算法实现对立方体的n次细分-Doo-Sabin subdivision. With de-boor algorithm to subdivision cube subdivision several times

三维数据点拟合空间球体的算法，利用最小二乘法实现空间球的拟合。-3D data points fitting the space sphere algorithm using the method of least squares fitting space ball.

基于泰勒展开的B样条插补算法实现程序，可供相关研究者参考。-B-spline interpolation algorithm program based on Taylor expansion , to provide a reference for the related researchers.

读取DXF文件和保存DXF文件,处理通用实体，并且加入了Polygon和Polyface的接口-his is not a complete DXF reader package, but it handles most entities that are commonly found. With this release I ve added the Polygon mesh and Polyface mesh varieties of POLYLINE, so a great