说明：  一篇关于点云预处理，利用NURBS生成曲面实体，并进行数控加工的论文，本着学习的交流的原则和大家共享，版权为原作者和原学校，希望对大家有帮助。
(One on the point cloud pre-processing, the use of NURBS surface is generated entities, and make CNC machining of papers, in line with the exchange of learning the principles and share the copyright for the original author and former school, we want to help.)