npc_headcrab_fast
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CFastHeadcrab |
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npc_headcrab_fast
is a point entity available in Half-Life 2 series and
Black Mesa.
This headcrab variant is much faster than the average headcrab. They typically infest rotting corpses rather than human hosts, creating the terrifying fast zombies. Since the headcrabs move and attack so quickly, they can be thought of as a substitute for the notorious snark of Half-Life 1. It is best to place them in small groups to rush the player.

Keyvalues
- Name (targetname) <string>
- The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g.
parentname
ortarget
).
Also displayed in Hammer's 2D views and Entity Report.See also: Generic Keyvalues, Inputs and Outputs available to all entities
BaseHeadcrab:
- Start burrowed (startburrowed) <boolean>
- Should this npc start burrowed? Will unburrow via input or if an enemy gets near.
Bug:Fast headcrabs lack the animations for un/burrowing (only classic headcrabs have them). Using this setting will cause them to pop up in the air instantly when approached. [todo tested in ?]
Tip:You can still use this to create ambushes. Simply cover it up with non-solid clutter, junk or a bit of displacement ground with collisions disabled.
CBaseCombatCharacter:
CAI_BaseNPC:
DamageFilter:
|
Flags
Start hidden : [65536]
Start hanging from ceiling : [131072]
Wait Till Seen : [1]
- Prevents this NPC from seeing (or being seen) until it enters a player's viewcone.
Gag : [2]
- Won't make IDLE sounds until it's angry.
Fall to ground (unchecked means teleport to ground) : [4]
Drop Healthkit : [8]
- Causes this NPC to drop an item_healthvial upon dying.
Efficient : [16]
- Don't acquire enemies or avoid obstacles
Wait For Script : [128]
- Forces this NPC to "wait" in an idle state until it finishes playing a scripted_sequence.
Long Visibility/Shoot : [256]
- By default, increases a NPC's sight range to
6,000
units and allows it to attack from anywhere within that distance.
Fade Corpse : [512]
Think outside PVS : [1024]
- Allows this NPC to run its regular AI outside of any player's PVS.
Template NPC : [2048]
- Marks this NPC as a template for entities like npc_template_maker. The NPC will not spawn on its own. This is not needed for point_template.



StartScripting
input does this.Don't drop weapons : [8192]
Ignore player push : [16384] (in all games since )
- Entity won't give way to player.
Inputs
- Burrow !FGD
- Burrow. If no burrow points within 512 units, does nothing.
- BurrowImmediate !FGD
- Burrow immediate.
- Unburrow !FGD
- Unburrow.
- StartHangingFromCeiling
- Start hanging from ceiling.
- DropFromCeiling
- Drop if hanging from ceiling.
CAI_BaseNPC:
- ActivateSpeedModifier !FGD
- DisableSpeedModifier !FGD
- Break
- Smash into pieces. If this is not possible, disappear.
- BecomeRagdoll (in all games since
)
- Remove itself and instantly become a ragdoll with zero force (just go limp). OnDeath, etc. outputs will NOT be fired.
- ForceInteractionWithNPC <string> <string> (in all games since
)
- Force the NPC to use a dynamic interaction with another NPC. Syntax is <targetname> <dynamic interaction>.
- ForgetEntity <targetname>
- Clears out the NPC's knowledge of a named entity.
- UpdateEnemyMemory (in all games since
)
- Update (or create) this NPC's memory of of the given entity.
- GagEnable
- GagDisable
- Gagged NPCs won't speak (or moan, caw, etc.) unless made to be a choreographed scene.
- HolsterWeapon (in all games since
)
- UnholsterWeapon (in all games since
)
- Force the NPC to holster or unholster their weapon. Ignored if the NPC is scripting or if the NPC doesn't use weapons.
- HolsterAndDestroyWeapon (in all games since
)
- Same as
HolsterWeapon
, except the weapon is destroyed once it has been concealed.
- IgnoreDangerSounds <float>
- Ignore danger sounds for the specified number of seconds.
- InsideTransition !FGD
- OutsideTransition !FGD
- SetBodyGroup <integer>
- HACK: Sets this NPC's body group (from 0–n).
- SetEnemyFilter <string>
- SetHealth <integer>
- Set the NPC's health.
- SetMaxLookDistance <float> (only in
)
- Sets the maximum look distance for the NPC. Defaults are 2048 and 6000 for long range NPCs.
- SetRelationship <string|targetname or classname> <string|disposition> <int|rank>
- Changes whether this NPC likes or dislikes certain others. Used like the ai_relationship entity, with this NPC as the subject.
- Values for
disposition
are:D_HT
: HateD_FR
: FearD_LI
: LikeD_NU
: Neutral
- SetSquad <string>
- Change the name of this NPC's squad. Leaving the parameter blank will remove the NPC from any existing squad.
- StartScripting
- StopScripting
- Enter/exit scripting state, where NPCs ignore a variety of stimulus that would make them break out of their scripts. They ignore danger sounds, ignore +Use, don't idle speak or respond to other NPCs' idle speech, and so on.
- Wake
- Wakes up the NPC if it is sleeping.
CBaseCombatCharacter:
- KilledNPC !FGD
- Tells the entity it killed something. Despite the name, this can include a player. This input will be automatically sent by the victim when they die.
- physdamagescale <float>
- Scales damage energy when this character is hit by a physics object. With a value of 0 the NPC will take no damage from physics.
DamageFilter:
Outputs
|
Dedicated Console Variables
Cvar/Command | Parameters or default value | Descriptor | Effect |
---|---|---|---|
sk_headcrab_fast_health | int | A fast headcrab's spawn health. |