Dropper (Portal 2)
1. Create a func_instance entity with the following properties:
Property Name Value Fix up Name box_dropper VMF Filename instances/gameplay/cube_dropper_normal.vmf
If the cube dropper doesn't show up then save and reload so you can position it properly.
2. Create the entity you want to activate the cube dropper. For example, a trigger_once at the entrance to the room, and give it the following outputs:
3. Hammer may indicate that these are invalid. Ignore it.