Six identical triangles can be formed by drawing two straight lines through an octagon's center point.
经过八角形的中心画两条直线，能够得到六个一样的三角形。
Through analyzing the perspective model of arbitrary point in space, two practical and fast methods of drawing two-point perspective are concluded.
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.
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。
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