Portal – Tutorial – Multiple Buttons For One Door

← Portal Level Creation

This tutorial will detail the basics of getting a door to open only when two (or more) buttons are activated.

Door, buttons and triggers

Create your doorway and two buttons by following the tutorials Floor button and Test Chamber Door.

Setting the buttons to open the door

Create a math_counter entity, and put it near your door. Set the following properties:

Property Name	Value
Name	door_counter
Maximum Legal Value	2

For the Maximum Legal Value key value, you can enter whatever number you need.

Now go to the Outputs tab and set the following outputs:

	My Output	Target Entity	Target Input	Parameter	Delay	Only Once
	OnHitMax	door_left	Open	<none>	0.00	No
	OnHitMax	door_right	Open	<none>	0.00	No

Now go to each of your floor_button_door brush entities and set these outputs:

	My Output	Target Entity	Target Input	Parameter	Delay	Only Once
	OnOpen	door_counter	Add	1	0.00	No
	OnClose	door_counter	Subtract	1	0.00	No
	OnClose	door_left	Close	<none>	0.00	No
	OnClose	door_right	Close	<none>	0.00	No

See also

• Portal Level Creation