首先我们需要对每个三角形顶点法线，但如何实现这一目标？
At first we need to get normals for each triangle vertex, but how to achieve this?
这种算法以多边形顶点法矢最简化准则为基本依据，能在保证地形视觉效果的前提下，对模型进行大幅度简化。
This algorithm considers the polygon vertex normal predigesting rule as a basic gist. On the precondition of assuring terrain effect, it can predigest models in large extent.
采用一个与视灭三角形相似的小三角形作为绘图辅助，同时结合量点法中的分量点概念进行作图，就可以很好地解决这个难题，而且能更加快速准确地绘制两点透视图。
This paper introduces the method of using a small triangle which is similar to the vision-vanishing point triangle to solve the problem, so that making perspective drawing more rapidly and precisely.
四点完形互动是布点法特有的课堂教学形式。
The complete reciprocal movement of four points is a special teaching form of distribution approach in class.
四点完形互动是布点法特有的课堂教学形式。
The complete reciprocal movement of four points is a special teaching form of distribution approach in class.
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