This paper develops the threshold brightness contrast experiments of human eyes, and determines the important factor K in the visibility calculation models.

本文通过进行人眼阈限亮度对比实验，确定了可见度计算模型中的重要系数K。

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Find all OQNs in the visited scene graph and set their visibility threshold.

查找已经遍历过的场景图中所有的OQN然后设置他们的可见性阈值。

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Be advised, poor visibility at the threshold due to a burning fuel truck.

进口处有燃烧的卡车，能见度差。

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