利用《航海天文历》查表的方法求取高度差法两要素，过程比较复杂。
It is complex to get the two factors in altitude difference method by consulting the "nautical almanac".
利用Z高度法效率高的优点，判断采样点是否超差；利用矢量分割法检测结果可靠性高的优点，求解沿着设计曲面的法矢方向以及采样点到刀具扫略体的距离（切削误差）。
By making use of Z depth efficiency in error judgement of sampling point and utilizing reliability of vector partition, it can define the cutting error on real time.
利用Z高度法效率高的优点，判断采样点是否超差；利用矢量分割法检测结果可靠性高的优点，求解沿着设计曲面的法矢方向以及采样点到刀具扫略体的距离（切削误差）。
By making use of Z depth efficiency in error judgement of sampling point and utilizing reliability of vector partition, it can define the cutting error on real time.
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