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From DarkAI

AI GET ENTITY CAN SEE

This command will return if the entity can see the specified point. If the entity is ducking, or Height is 0 then half height objects will register as blocking the entity's view. This command will return which view angle the point is in, if it can be seen, in the order specified below. If the point is beyond the entity's view range (see AI Set Entity View Range) then 0 will be returned.

Syntax
return integer = AI Get Entity Can See ( Entity Number, X#, Z#, Height )

Parameters
Entity Number, The id of the entity you want to know can see.
X#, The X position of the point to see.
Z#, The Z position of the point to see.
Height, 1 if the point to see is at eye level, above half height objects, 0 if low.

Return
2 if the the point is within the inner view arc, 1 if the point is within the outer view arc, 0 if the point cannot be seen.