The perspective direction of a desired line is usually determined by connecting a given point with the vanishing point of this line.
连接灭点与已知点的透视，决定了所作直线的透视方向。
The perspective direction of a desired line is usually determined by connecting a given point with the vanishing point of this line.
连接灭点与已知点的透视，决定了所作直线的透视方向。
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