分割点云，并通过局部拟合求取法向量，实现点云压缩-Split point cloud, and through local fitting strike normal vector of point cloud compression

移动立方体（MarchingCubes）算法，(1)体素中由三角面片逼近的等值面计算；(2)三角面片各顶点法向量计算。- (MarchingCubes) algorithm, isosurface (1) voxel approximation calculation by the triangular facets (2) triangular faces each vertex normal vector calculations.

b样条曲线求解过程及其法矢方向的求取，上传共享一下(B spline curve solving process and its normal vector direction, and upload to share)

由点云数据，三角面片法向量 生成3d打印的stl文件(obtain the stl file which used to 3D printing, run from point cloud, normal vector files)