同时， 利用他们的演算法也能 够找出平面方向(plane orientations)、 内部照像机參數(internal camera parameters)… 等资料， 以建构出建筑物的场景。
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这是比较微妙的，可以找出与所有平面平行的直线方向。
So, at some point we saw other subtle things about how to find the direction of this line that's parallel to all the planes.
用沿着向量方向的平面,切开图像,然后看图像的剖面图，找出斜率。
We'll be slicing things by a plane that is now in the direction of this vector,u and we'll be looking at the slope of the slice of the graph.
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