当然，我们把它分为，垂直方向，就像，我们分析的那样。

Of course, we always split it into perpendicular directions because of the way that we analyze this.

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首先我们从名字上开始分析，所谓“法线”指的是垂直于平面的向量，我们使用这个来计算光照。

Let's break the name down. The "normal" is a vector perpendicular to a surface, which we can use to calculate lighting.

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他们的系统能够分析户外场景的相片，将“天空”与“地面”识别开，并且寻找视觉线索来区分水平面与垂直面。

Their system analyses photographs of outdoor scenes, identifies “sky” and “ground” regions, and looks for visual cues that distinguish horizontal surfaces from vertical ones.

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