As an important approach for improvement of productive efficiency and shape design, more and more attention is paid for reverse engineering, fitting of quadratic surface is one of its components.
作为提高生产效率和改善造型设计的重要途径，逆向工程受到越来越多的重视，空间二次曲面拟合是其重要组成部分之一。
Nowadays, general fitting methods are based on the character equations of quadratic surface to implement. For it is so complicated that a lot of fitting software exist a lot of restrict conditions.
目前的通用方法都是基于二次曲面的特征方程进行拟合，由于特征方程求解复杂，因此这些拟合软件在进行曲面拟合时均存在很多的限制条件。
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