hyperbolic quadratic surface 双曲型二次曲面
elliptic quadratic surface [数] 椭圆型二次曲面
general quadratic surface 一般二次曲面
parabolic quadratic surface [数] 抛物型二次曲面
Quadratic Surface Fitting 曲面拟合 ; 二次曲面拟合
parametric quadratic surface 参数二次曲面
Secondly,quadratic surface often appears in traditional work-pieces. But unfortunately,there is no linear fitting method for cylinder and cone.
针对工程实际中扫描点云的特点,提出了一种二次曲面非线性拟合初值选择方法。
参考来源 - 大规模散乱点云数据后处理技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
With this method, shape points were calculated by surface outline equation got from quadratic surface.
该方法通过二次曲面求管线表面轮廓方程进而求得管线的型值点集。
From this paper, the equations of tangent planes of a quadratic surface are obtained by matrix operations.
本文应用矩阵的运算，给出求二次曲面的切平面方程的一个筒单方法。
The problem to determine the principal axis of quadratic surface is summed up to be that of finding the stop point of J-function.
并将确定二次有心曲面的主轴问题，归结为求J函数的逗留点问题。
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