如果建筑物仅有铅垂轮廓线与画面平行，而另外两组水平的主向轮廓线，均与画面斜交，于是在画面上形成了两个灭点Fx及Fy，这两个灭点都在视平线hl上，这样形成的透视图称为两点透视。正因为在此情况下，建筑物的两个立角均与画面成倾斜角度，故又称成角透视。属于美术名词。
在手工绘制两点透视图时，都会碰到图幅过大造成灭点与视点落在图板之外而难以操作的难题。
By employing this, the two point perspective view can be completed with the auxiliary point even in the extremely difficult situation.
通过对空间任意点的透视模型进行分析，总结推论出两种行之有效的快速手工绘制两点透视图的方法。
Through analyzing the perspective model of arbitrary point in space, two practical and fast methods of drawing two-point perspective are concluded.
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.
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