Complimentary Victory Lift
Introduction
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In this tutorial you will learn how to make a Complimentary Victory Lift in the Hammer Editor.
The piston
First thing to do is to make the func_door.
You can use mini_piston_inside.mdl or you can copy the fake piston from the example map provided with Portal.
I'm using the fake piston for the tutorial, you may want to use the clipping_tool to cut the fake piston to the appropriate size. If you're using the model piston, then simply parent it to a func_door brush that is an appropriate size.
Place your piston where you want it and give it the following parameters:
Property Name Value Name victory_lift Delay Before Reset 0 Speed 25 Move Direction (Use the top view to set this parameter) or Up or Down
Platform
Now you need something to stand on. Create a prop_dynamic and set its World Model to lift_platform.mdl or light_rail_platform.mdl and place it at the top of your piston.
Give the model the following parameters:
Property Name Value Name victory_lift_model Parent victory_lift World Model lift_platform.mdl or light_rail_platform.mdl
Make sure to uncheck the Touch opens Flag.
Glass
You'll notice there is no glass to stand on, so go ahead and make a 116L x 116W x 2H block and texture it with glass/glasswindow_frosted_004 and place it where it should be. Set your grid size to 2 for easy placement.
The trigger
This tutorial assumes you have moderate knowledge of I/O's. Add the Outputs to those which apply.
Area trigger
Encase the desired area with a brush textured with the trigger texture. Tie it to a trigger_multiple and add the following outputs:
My Output Target Entity Target Input Parameter Delay Only Once 
OnEndTouchAll victory_lift Close <none> 0.00 No OnStartTouchAll victory_lift Open <none> 0.00 No
Note:Also make sure to parent the area trigger to victory_lift.Button trigger
Add these outputs to the buttons' door:
My Output Target Entity Target Input Parameter Delay Only Once OnClose victory_lift Close <none> 0.00 No OnOpen victory_lift Open <none> 0.00 No
Switch Trigger
Add these outputs to the trigger on the switch:
My Output Target Entity Target Input Parameter Delay Only Once OnOut victory_lift Close <none> 0.00 No OnPressed victory_lift Open <none> 0.00 No
And now your Complimentary Victory Lift is done! Just compile and test for errors!