func_areaportal
From Valve Developer Community
This is a brush entity available in all Source games. It creates an areaportal, used to manage visibility in maps. When the portal is open it stops objects not visible through it from rendering; when the portal is closed it cannot be seen through at all.
The entity's brush must be textured with tools\toolsareaportal (seen on the left) for it to function.
See also
Keyvalues
- Name of Linked Door
<targetname> - A prop_door_rotating or func_door whose open/closed state controls the on/off state of the portal.
- Initial State
<bool> - Initial state of the portal.
Targetname:
- Name <string>
- The targetname other entities refer to this entity by.
Inputs
- Open
- Close
- Toggle
- Control the state of the portal.
Targetname:
-
Kill - Removes this entity from the world.
-
KillHierarchy - Removes this entity and all its children from the world.
-
AddOutput <string> - Evaluates a keyvalue/output on this entity. It can be potentially very dangerous, use with care.
- Format:
<key> <value> - Format:
<output name> <targetname>:<inputname>:<parameter>:<delay>:<max times to fire, -1 means infinite> -
FireUser1toFireUser4 - Fire the
OnUseroutputs; see User Inputs and Outputs.
Outputs
Targetname:
-
OnUser1toOnUser4 - Fired in response to the
FireUserinputs; see User Inputs and Outputs. -
OnKilled(New with Left 4 Dead) - Fired when the entity is killed and removed from the game.

