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Visibility refers to what can be seen by a player or NPC while a game is running. It is impacted by the PVS, but the two are not mutually inclusive.

Warning.pngRisk of Confusion:Visability[sic], as coined in the Hammer 3.x Worldcraft 2.0 changelog, refers to what is seen by VIS. Stuff such as func_detail can block visibility without blocking visability. For more information, see VIS optimization.