How do you know the distance to a light emitter?

那么你怎样知道一个灯光投射器的距离值呢？

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Square - The Area Light emitter has a square shape.

正方形-区域灯光发射体呈正方形。

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Rect - The Area Light emitter has a rectangular shape.

矩形-区域灯光发射体呈矩形。

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Rect - The Area Light emitter has a rectangular shape.

矩形-区域灯光发射体呈矩形。

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