It is difficult to search the best projection point of two dimension, but it can be solved by transforming a nonlinear optimization question.
应用该法的关键在于寻求二维空间的最佳投影点，这可以转化为一个复杂的非线性优化问题来进行解决。
To study the intersection visibility of two general place planes, this paper set the planes as two faces of front and backs from the point of projection character of a space plane.
为了研究两平面相交可见性的规律，从空间一个平面的投影特点入手，将平面分别设定为正面、背面两面，讨论平面图形各顶点投影顺序与平面正面、背面的投影所具有的内在规律。
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