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Could u plz explain more how to add interactions ?

So my goal is to use an item on a character and after I've done that the door would open. So like he'd open the door for me.

I used this code:

Code: ags

function cVamp_UseInv()
{
if (player.ActiveInventory == iexampleitem) {
oDoorOpen.Visible = false;
oDoorClose.Visible = true;
player.LoseInventory(iexampleitem);
}

But ingame when I use the item on the character nothing happens.
I also wrote that code in the room.asc where the character and the door was.
if anyone has any idea what might be the problem thenplease help