投影面可为基本投影面也可为新设的垂直面或一般位置平面。
The projection plane may be the basic projection plane, newly-established vertical plane or common place plane, and the direction of the projection may slope.
本文以一般位置平面为辅助截平面，用求迹线方法，在一个视图求作两单曲面偏交交线。
With the ordinary camber used as auxiliary cross section, the line of intersection of two biasing single cambers is worked out in a view with the method for line of nodes.
利用实四元数理论，提出了一种将一般位置平面曲线变换到空间任意指定位置的一种简捷方法。
A new effective method which makes use of quaternion theory is presented to implement location transformation of a plane curve.
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