经过了关于我的电脑的一场虚惊，我终于决定发布我的Blog了，务必把日常的电脑操作经验积累下来，以备不测。
要知道，真正遇到麻烦时没有资料是多么痛苦的事，好在当时我手头有能上网的备用电脑。
虚惊过后，我深刻反思，决定开始积累经验了。
就这么决定了。
开始动手吧！
要知道，真正遇到麻烦时没有资料是多么痛苦的事，好在当时我手头有能上网的备用电脑。
虚惊过后，我深刻反思，决定开始积累经验了。
就这么决定了。
开始动手吧！
In perspective drawing, a vanishing point represents a group of parallel lines, in other words, a direction. For any point on the paper, if we want a line towards the same direction (in the 3d space), we simply draw a line through it and the vanishing point. But sometimes the vanishing point is too far away, such that it is outside the paper/canvas. In this example, we have a point P and two perspective lines L1 and L2. The vanishing point VP is naturally the intersection of L1 and L2. The task is to draw a line through P and VP, without having VP on the paper. I am aware of a few traditional solutions: 1. Use extra pieces of paper such that we can extend L1 and L2 until we see VP. 2. Draw everything in a smaller scale, such that we can see both P and VP on the paper. Draw the line and scale everything back. 3. Draw a perspective grid using the Brewer Method. #1 and #2 might be quite practical. #3 may not guarantee a solution, unless we can measure distances/p...
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