WoW API: UnitIsVisible

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Indicates whether the game client (rather than the player) can see unit.

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Arguments

(String unit)

unit

UnitId of the unit

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Returns

vis

Number - 1 if client can see unit, nil if not

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Details

The game client can see objects (including units) that the server has told it to load (and has not yet told it to unload). The server provides objects in a 100-yard radius, but seems to load them in batches.

This does not check for line-of-sight, only for game client visibility.