Hunters are armed with flechette cannons, which fire bursts of needle-like projectiles that stick to physics props and explode a few seconds later. They can also lash out with one of their front legs or impale with their mandibles (seen beneath the "eyes"). They are one of the few NPCs who can perform dynamic interactions, throwing citizens (and anyone with citizen animations) to the ground and crushing their spines.
Hunters take less damage from bullets (multipled by 0.6 by default), slightly less damage from buckshot (shotgun) ammo (multiplied by 0.5 by default), and even less damage from citizens, Alyx, etc. (multiplied by 0.3 by default). Multipliers are controlled by
sk_hunter_bullet_damage_scale respectively. An exception to this rule is the 357, which actually multiplies damage by 1.16. Hunters also take more damage while charging, multiplied by
sk_hunter_charge_damage_scale and set to 2.0 by default. Hunters can be killed instantaneously with energy balls fired from the AR2.
Warning: While the player's energy balls can immediately kill a hunter, NPC balls (e.g. balls fired by a Combine elite) use a different damage model and do not kill hunters instantly, only dealing a metered amount of damage.
In Half-Life 2: Episode Two, hunters are introduced when one of them ambushes Alyx and critically wounds her. They make several appearances throughout the game, largely in their own packs or fighting alongside Combine soldiers. They travel with striders in the ending battle, protecting them from Magnusson devices.
Hunters are widely considered to be the successor to Half-Life's houndeyes.
- Strider to Follow
- The name of the strider that this hunter should escort. They will follow the strider closely in combat and shoot down incoming Magnusson devices.
- Values for
- Target Path Corner
- The path_corner that this NPC will move to after spawning.
- Squad Name
- NPCs that are in the same squad (i.e. have matching squad names) will share information about enemies, and will take turns attacking and covering each other.
- Hint Group
- Hint groups are used by NPCs to restrict their hint-node searching to a subset of the map's hint nodes. Only hint nodes with matching hint group names will be considered by this NPC.
- Hint Limit Nav
- Limits NPC to using specified hint group for navigation requests, but does not limit local navigation.
- Sleep State
- Holds the NPC in stasis until specified condition. See also 'Wake Radius' and 'Wake Squad'.
- 0: None
- 1: Waiting for threat
- 2: Waiting for PVS
- 3: Waiting for input, ignore PVS
- 4: Auto PVS
- 5: Auto PVS after PVS
- Wake Radius
- Auto-wake if player within this distance
- Wake Squad
- Wake all of the NPCs squadmates if the NPC is woken
- Enemy Filter
- Filter entity to test targets against
- Ignore unseen enemies
- Prefer visible enemies, regardless of distance or relationship priority
- Physics Impact Damage Scale
- 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.
- Disable shadows (disableshadows)
- Prevent the entity from creating cheap render-to-texture shadows. Does not affect shadow mapping.
- Disable ShadowDepth (disableshadowdepth)
<boolean>(New with Portal 2)
- Used to disable rendering into shadow depth (for projected textures) for this entity.
- Projected Texture Cache (shadowdepthnocache)
<choices>(New with Portal 2)
- Used to hint projected texture system whether it is sufficient to cache shadow volume of this entity or to force render it every frame instead.
- 0 : Default
- 1 : No cache - render every frame
- 2 : Cache it - render only once
- Render Mode (rendermode)
- Set a non-standard rendering mode on this entity.
- Render FX / Transparency (0 - 255) (renderamt)
- Transparency amount, requires a Render Mode other than Normal. 0 is invisible, 255 is fully visible.
- Render Color (R G B) (rendercolor)
- Color tint.
- Disable Receiving Shadows (disablereceiveshadows)
- Prevent the entity from receiving shadows on itself.
- Render FX (renderfx)
- Preset pattern of appearance effects.
- Pitch Yaw Roll (Y Z X)
- This entity's orientation in the world. Pitch is rotation around the Y axis, yaw is the rotation around the Z axis, roll is the rotation around the X axis.
- Entity Scripts
<scriptlist>(New with Left 4 Dead 2)
- Space delimited list of VScript files (without file extension) that are executed after all entities have spawned. The scripts are all executed in the same script scope, later ones overwriting any identical variables and functions.
- Script think function
<string>(New with Left 4 Dead 2)
- Name of a function in this entity's script which will be called automatically every 100 milliseconds (ten times a second) for the duration of the script. It can be used to create timers or to simulate autonomous behavior. The return value (if present) will set the time until the next call. Note:Try to avoid expensive operations in this function, as it may cause performance problems.
- Allow Physics Gun (gmod_allowphysgun)
<boolean>(Only in Garry's Mod)
- If set, players cannot use Physics Gun on this entity.
- Sandbox Tool Whitelist (gmod_allowtools)
<string>(Only in Garry's Mod)
- If set, only given tools can be used on this entity. You need to supply the tool class names, the names of the .lua files of those tools. This also includes the context menu properties!
- 1: Wait Till Seen
- 2: Gag (No IDLE sounds until angry)
- 4: Fall to ground (unchecked means *teleport* to ground)
- 8: Drop Healthkit
- 16: Efficient - Don't acquire enemies or avoid obstacles
- 128: Wait For Script
- 256: Long Visibility/Shoot
- 512: Fade Corpse
- 1024: Think outside PVS
- 2048: Template NPC: This entity is a template for
npc_template_maker. It will not spawn automatically and cannot be used with
- 4096: Do Alternate collision for this NPC (player avoidance) Note:This flag is disabled in episodic for player companions because the
StartScriptinginput does this.
- 8192: Don't drop weapons
- 16384: Ignore player push (New with Half-Life 2: Episode One / Source 2006): Don't give way to player
- Sets the name of the strider the Hunter should escort.
- Forces the Hunter to shoot its flechette cannon at the specified target
- How long the Hunter will spend firing its flechette cannon after receiving the above input.
- The name of any npc_bullseyes to shoot at when I can't shoot at the player. Uses a single targetname that can be a wildcard.
- If a Hunter cannot shoot, it will try to use its melee attacks.
- Enables/disables a delay between ranged attacks from members of one Hunter squad.
- Used mainly for scripted attacks against bullseyes. Enables the hunter to shoot without having to plant its legs in the ground first. Remember to disable afterwards!
- Crouch down / return to standing
- Unused. Prevented/allowed Hunters to move while crouched.
- Hunter will instantly do the defensive physics blast. (Non-functional)
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
- Set the NPC's health.
AddHealth <int>(New with Half-Life 2: Episode Two / Source 2007)
RemoveHealth <int>(New with Half-Life 2: Episode Two / Source 2007)
- Add to or remove from the NPC's health.
- HACK: Sets this NPC's body group (from 0 - n).
- Scales the damage taken when this character is hit by a physics object. 0 means this feature is disabled for backwards compatibility.
- Burst into flames.
- Ignite for the given number of seconds.
- Ignite with the given number of hitbox fires.
- Ignite with the given hitbox fire scale.
- Smash into pieces. If this is not possible, disappear.
BecomeRagdoll(New with Half-Life 2: Episode Two / Source 2007)
- Remove itself and instantly become a ragdoll with zero force (just go limp). OnDeath, etc. Outputs will NOT be fired.
- 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 NPC's idle speech, and so on.
- Start an assault at the given rally point.
- Change the name of this NPC's squad. Leaving the parameter blank will remove the NPC from any existing squad.
- Wakes up the NPC if it is sleeping.
- Clears out the NPC's knowledge of a named entity.
- Gagged NPCs won't speak (or moan, caw, etc.) unless made to be a choreographed scene.
- Ignore danger sounds for the specified number of seconds.
HolsterWeapon(New with Half-Life 2: Episode One / Source 2006)
UnholsterWeapon(New with Half-Life 2: Episode One / Source 2006)
- Force the NPC to holster or unholster their weapon. Ignored if the NPC is scripting or if the NPC doesn't use weapons.
HolsterAndDestroyWeapon(New with Half-Life 2: Episode One / Source 2006)
HolsterWeapon, except the weapon is destroyed once it has been concealed.
ForceInteractionWithNPC <string> <string>(New with Half-Life 2: Episode One / Source 2006)
- Force the NPC to use a dynamic interaction with another NPC. Syntax is
<targetname> <dynamic interaction>.
UpdateEnemyMemory(New with Half-Life 2: Episode One / Source 2006)
- Update (or create) this NPC's memory of of the given entity.
<float>(Only in Garry's Mod)
- Sets the entity's transparency to a number from 0 (invisible) to 255 (fully visible). Requires the entity to have its Render Mode (rendermode) set to a number other than
- Sets an RGB color for the entity.
- Removes this entity and any entities parented to it from the world.
- Functions the same as
Kill, although this entity and any entities parented to it are killed on the same frame, being marginally faster than
- Evaluates a keyvalue/output on this entity. It can be potentially very dangerous, use with care.
<output name> <targetname>:<inputname>:<parameter>:<delay>:<max times to fire, -1 means infinite>
- Fire the
OnUseroutputs; see User Inputs and Outputs.
- Same as a player invoking +use; may not do anything. Can also be invoked by creating an output that does not specify an input.
This input is not included in Valve's FGDs.
<script>(New with 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.
<string>(New with 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: In , the code is executed in the script scope of the entity that fires the output, not the one receiving the input.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.
<string>(New with Left 4 Dead 2) !FGD
- Execute a VScript function in the scope of the receiving entity.
<coordinates>(New with 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.
<angles>(New with Alien Swarm) !FGD
- Set this entity's angles.
- Fired when this NPC takes damage (activator is the damage inflictor)
- Fired when this NPC is killed (activator is the killer)
- Fired when this NPC reaches half of its maximum health
- Fired when this NPC hears a sound (other than combat or the player)
- Fired when this NPC hears the player
- Fired when this NPC hears combat sounds
- Fired when this NPC establishes line of sight to its enemy
- Fired when this NPC loses line of sight to its enemy
- Fired when this NPC loses its enemy. Usually due to the enemy being killed/removed, or because this NPC has selected a newer, more dangerous enemy
- Fired when this NPC establishes line of sight to its enemy, and that enemy is a player
- Fired when this NPC loses line of sight to its enemy, and that enemy is a player
- Fired when this NPC loses its enemy, and that enemy was a player. Usually due to the enemy being killed/removed, or because this NPC has selected a newer, more dangerous enemy
- Fired when this NPC is hurt by a player (activator is the attacker or vehicle driver (if friendly fire))
- Fired when this NPC is hurt by a player OR by one of the player's squadmates (activator is the attacker or vehicle driver (if friendly fire))
- Fired when this NPC has refused to join the player's squad
- Fired when this NPC enters a sleep state
- Fired when this NPC comes out of a sleep state
- Fired when the NPC starts a forced interaction.
- Fired when the NPC aborts a forced interaction for some reason (target NPC died, couldn't be pathed to, etc)
- "NPCs in actbusies can no longer perform dynamic interactions." To do: What does this mean?
- These Outputs each fire in response to the firing of the like-numbered
FireUser4Input; see User Inputs and Outputs.
OnKilled(Only in the Left 4 Dead series)
- This Output fires when the entity is killed and removed from the game.