WisePounder: Zombie Pounder

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This tutorial was originally created by wisemx.

Ported from SDKnuts.net to VDC by: Pinsplash (talk) 03:58, 21 July 2018 (UTC)


Events in this project:

  1. Zombie tries to break glass to get to Alyx.
  2. Glass breaks, Zombie attacks, Alyx shoots Zombie.



The Zombie isn’t really trying to get to Alyx, it just looks that way. When the map spawns I’m using ai_relationship entities and an npc_bullseye. It’s actually the invisible npc_bullseye the Zombie hates.

There are three ai_relationship entities in this project.

  1. Alyx likes the Zombie, until the glass breaks, then hates the Zombie.
  2. Zombie hates the npc_bullseye.
  3. Zombie likes the Player.

They all start Active.

To get the Zombie to pound on the glass I used a scripted_sequence.

  • Name: seq_pounder
  • Target NPC: zombie_pounder
  • Action Animation: WallPound
  • Move to Position: Run
  • Flags: Repeatable, Override AI

Because the WallPound animation is short I’ve used a logic_timer to replay the animation.

  • Name: zombie_timer
  • Start Disabled: Yes
  • Use random time: No
  • Refire interval: 1
  My Output Target Entity Target Input Parameter Delay Only Once
Io11.png OnTimer glass_counter Add 1 0.00 No
Io11.png OnTimer seq_pounder BeginSequence   0.50 No

Notice the logic_timer adds a value to a math_counter. These are really simple to use if you give them a chance.

  • Name: glass_counter
  • Initial value: 0
  • Min value: 0
  • Max value: 3
  My Output Target Entity Target Input Parameter Delay Only Once
Io11.png OnHitMax bigwindow Break 0.50 Yes

Experiment with the timing of the sequence and the Max value for the math_counter to alter the effect.

When the map loads the Zombie is spawned and the logic_timer is then activated 3 seconds later. This is done with a trigger_once.

  My Output Target Entity Target Input Parameter Delay Only Once
Io11.png OnTrigger glass_pounder_spawn Spawn 0.00 Yes
Io11.png OnTrigger zombie_timer Enable   3.00 Yes

The Zombie is spawned by way of an npc_template_maker.

  • Name: glass_pounder_spawn
  • Start disabled: Yes
  • Number of NPCs: 1
  • Freq: 1
  • Max live: 1
  • Name of template NPC: zombie_pounder
  • Radius: 256
  My Output Target Entity Target Input Parameter Delay Only Once
Io11.png OnSpawnNPC seq_pounder BeginSequence 1.50 Yes

As you can see, from this npc_template_maker the scripted_sequence is first activated.

These are the properties for Alyx:

  • Name: alyx01
  • Weapon: Alyx Gun
  • Flags: Gag, Fall to ground, Think outside PVS, Don’t drop weapons


  • Name: zombie_pounder
  • Flags: Gag, Fall to ground, Template NPC

As you can see from the image below there are a lot of entities used in this project.


It helps if you keep them tidy like the image above, as you add more and more NPC’s and sequences you don’t want to go crazy trying to figure out what you’ve done. The glass in this project is func_breakable_surf. Please refer to the project file below for properties and settings I didn't list on this page.

See Also