平面与立体（几何体）表面相交，该平面称为截平面。由于几何体（包括圆柱,圆锥,球,棱柱,长方体,正方体等等）的不同，得到的平面图形可能是圆、可能是椭圆、也可能是三角形、四边形、六边形等等。
随着截平面位置的改变，可以在锥面上截出形状不同的椭圆。
We can obtain ellipses of different shapes by intersecting a cone with a plane in different relative positions.
根据三维造型数据，采用基于等距面的截平面法进行精加工。
According to the geometrical data of a three-dimensional model, finish machining strategy with section plane method is adopted on the basis of the offset surface.
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.
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