For section displays, the cutting plane is assumed to be perpendicular to this line.

为显示指定一个浏览方向，切割平面假设与这条线垂直。

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For NC machining of plane section method, the machining path of tool cutting plane and implicit surface can be found, and the curve of the tool path is drawn by the positive-negative method.

把隐函数的优势应用到数控加工编程中，即对于截面法的数控加工，求出刀具切削平面与隐函数曲面的加工轨迹，再用正负法绘制刀具轨迹曲线。

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