曲面驱动加工方向用GPA函数如何定义？

&PROSRF - Reference Vector - Surface Contouring

Synopsis

&PROSRF

Description

Used to specify the drive surface reference vector. The purpose of the reference vector is twofold. First, it indicates the material side of the drive surfaces. Second, it indicates the the projection direction of &REFPT onto the drive surfaces.

Characteristics

Write Only - Three Position Numerical Array - Any Real Number

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我用这个函数定义了切削方向和材料方向 但是它每次都是由下往上生成刀路，试了很多改变X,Y,Z数组的值，都不好使，想通过参考点去设置Reference Point - &REFPT 也不好使，请高手指点！！！