点云三维重建中需要用的法向量计算，能够有效避免法向量不一致的问题，更好进行三维重建。测试有用。-Normal vector calculation point cloud reconstruction in need, and can effectively avoid the problem of inconsistent normals, better three-dimensional reconstruction. Useful for testing.

3点一维标定杆的摄像机标定，求得内外参数矩阵，实现三维重建。-Camera calibration of 3 point one-dimensional calibration bar, internal and external parameter matrix is obtained, the realization of three-dimensional reconstruction.