As an appendix, expression for escape sign, size of Graph and letter, colour, brightness, brightness contrast, visibility and apparent distance are also listed from technical requirements.
作为附录，还列出了疏散标志的表示方法、图形文字尺寸、颜色、亮度、亮度比、可见度、视距等技术要求。
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。
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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