Gets the index of the door based on the view geometry component index.
Используется в ActionCloseDoors::ActionCondition(), ActionLockDoors::ActionCondition(), ActionOpenDoors::ActionCondition(), ActionUnlockDoors::ActionCondition(), ActionLockDoors::LockDoor(), ActionCloseDoors::OnStartServer(), ActionOpenDoors::OnStartServer() и ActionUnlockDoors::UnlockDoor().