c simple, tu cree une balise, et tu met sur cette balise une location, par exemple location " stack"
tu va dans declencheurs, on va activer le stack pour le joueur 1:
Players: Player 1
Conditions: Players 1 brings at least 1 any unit to " stack".
Actions: Run AI Script: Turn OFF Shared Vision for player 1.
ET
Players: Player 1
Conditions: Players 1 brings at most 0 any unit to " stack".
Actions: Run AI Script: Turn ON Shared Vision for player 1.
Vouala 