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Left 4 Dead Left 4 Dead 2 env_player_blocker is a point entity available in the Left 4 Dead series. It blocks any PC/NPC from entering of the specified type.
Examples of its use can be found in L4D1 Authoring Tools SDK content, such as the l4d_airport03_garage.vmf crescendo event.
It has also been used a lot in L4D2's _Commentary files in the maps folder. Those have been used to block areas where survivors could remain unharmed by infected. Or in the case of C4M2_Sugarmill_a, where Survivors are blocked from jumping onto a set of pipes to gain higher ground prematurely.

This entity is a very useful option for clips that must be toggled on and off during gameplay.


Mins (boxmins) <vector>
Maxs (boxmaxs) <vector>

An outlined box is displayed in Hammer when Mins/Maxs are specified.

Initial State (initialstate) <choices>
Initial state of the blocker
  • 0 : Disabled
  • 1 : Enabled
Blocks (BlockType) <choices>
What should be blocked
  • 0 : Everyone
  • 1 : Survivors
  • 2 : Player Infected
  • 3 : All Special Infected (Player and AI)

Name (targetname) <string>
The targetname that other entities refer to this entity by.


Enables the Blocker
Disables the Blocker

Removes this entity from the world.
Removes this entity and its children from the world.
Note.png Note: Entities already remove orphaned children upon being removed, but this input removes all children on the same frame, being marginally faster than Kill.
AddOutput <string>
Adds a keyvalue/output to this entity. It can be potentially very dangerous, use with care.
KV Format: <key> <value>
I/O Format: <output name> <targetname>:<inputname>:<parameter>:<delay>:<max times to fire, -1 means infinite>
FireUser1 to FireUser4
Fire the OnUser outputs; see User Inputs and Outputs.
Use  !FGD
Same as a player invoking +use; may not do anything depending on the entity. Can also be invoked by firing an output that does not specify an input.
RunScriptFile <script> (in all games since Left 4 Dead 2)
Execute a VScript file from disk, without file extension. The script contents are merged with the script scope of the receiving entity.
RunScriptCode <string> (in all games since Left 4 Dead 2)
Execute a string of VScript source code in the scope of the entity receiving the input. String quotation may be needed when fired via console.
Bug.png Bug: In Left 4 Dead 2, the code is executed in the script scope of the entity that fires the output, not the one receiving the input.
Warning.png Warning: Never try to pass string parameters to a script function with this input. It will corrupt the VMF structure because of the nested quotation marks, which then must be removed manually with a text editor.
CallScriptFunction <string> (in all games since Left 4 Dead 2) !FGD
Execute a VScript function in the scope of the receiving entity.
SetLocalOrigin <coordinates> (in all games since Alien Swarm) !FGD
Send this entity to a spot in the map. If the entity is parented to something, it will be offset from the parent by this amount.
SetLocalAngles <angles> (in all games since Alien Swarm) !FGD
Set this entity's angles.


OnUser1 to OnUser4
These outputs each fire in response to the firing of the like-numbered FireUser1 to FireUser4 Input; see User Inputs and Outputs.
OnKilled  (only in Left 4 Dead Left 4 Dead 2)
This output fires when the entity is killed and removed from the game.