Active/Desactive BillBoards

[onv]

Yea , i thinked about that , but i can't do it , because :

There is a trollface attached on a wall.When the player enter an area , i want the trollface not to be visible , and a exocist face to cover it.If i applies your suggestion , the trollface would not be seen , since the black(because there will be no light untill the callback is called)exocist face will cover the trollface , so : No scare at all !