In the transformation of descriptive geometry, no matter the method of change plane or revolve, the oblique line can be changed to a vertical line in two successive transformations.
在画法几何投影变换中，不论用换面法或旋转法，一般位置直线均需两次变换才能变成投影面垂直线。
Through the method in which a plane in space can be determined by normal and normal plane, the complicated problems in space geometry can be imaged into the problems in plane geometry.
用法线和法线平面确定空间平面位置的方法，将复杂的空间几何问题简化为平面几何问题。
Editing in 3d environment by a digital control plane, the method can deal with some geometry efficiently, such as point, line, and polygon, etc.
由数字控制平面的3d环境中的编辑，该方法可以处理一些几何效率，如点，线，多边形等。
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