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想像而家有一笪 3D 空間有條火車軌,兩條軌成平行,定義上,兩條平行嘅線係永遠唔會相交嘅[註 1],不過如果望吓睇嘢嗰個人見到嗰幅 2D 影像,就會發覺由嗰幅 2D 影像睇,兩條軌望落會好似係一點嗰度相交噉。嗰一點就係消失點。
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