npc_enemyfinder is a model entity available in all 
Source games.
Entity description
This NPC is invisible, immobile, and does not cause collisions. Its sole purpose is to notify the squad mates whenever an enemy comes into its view so put it into the same squad as NPCs whose enemies npc_enemyfinder has to consider its enemies.
When running ent_text command on npc_enemyfinder, colourful lines start pointing from it towards player and other NPCs.
- Blue lines mean that NPCs that this entity is in squad together with consider the entity that the line points towards to neutral.
- Red lines mean that they hate that entity.
Situation where npc_enemyfinder's squadmates -
npc_metropolice consider player an enemy at the start of the apartment raid
Situation where npc_enemyfinder's squadmates - npc_metropolice now consider player and citizens an enemies
Keyvalues
BaseNPC keyvalues
Expand
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CBaseCombatCharacter:
- Relationship (Relationship) <string> !FGD
- <string|targetname or classname> <string|disposition> <int|rank>
- Changes whether this entity likes or dislikes certain other things. Used like the ai_relationship entity, with this entity as the subject.
- Values for
disposition are:
D_HT: HateD_FR: FearD_LI: LikeD_NU: Neutral
- Physics Impact Damage Scale (physdamagescale) <float>
- Multiplier for damage amount when this entity is hit by a physics object. With a value of 0 the entity will take no damage from physics.
CAI_BaseNPC:
- Target Path Corner (target) <targetname>
- The path_corner that this NPC will move to after spawning.
- Squad Name (squadname) <string>
- 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 (hintgroup) <string>
- 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 (hintlimiting) <boolean>
- Limits NPC to using specified hint group for navigation requests. Does not limit local navigation.
- Sleep State (sleepstate) <choices>
- 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 (wakeradius) <float>
- Auto-wake if player comes within this distance.
- Wake Squad (wakesquad) <boolean>
- Wake all of the NPCs squadmates if the NPC is woken.
- Enemy Filter (enemyfilter) <targetname>
- Filter entity to test targets against.
- Ignore unseen enemies (ignoreunseenenemies) <boolean>
- Prefers visible enemies, regardless of distance or relationship priority.
DamageFilter:
- Damage Filter (damagefilter) <targetname>
- Name of the filter_damage_type entity that controls which entities can damage us.
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Parentname:
- Parent (parentname) <targetname>
- Specifies a movement parent. An entity will maintain its initial offset from its parent. An attachment point can be added to the end of the name, separated by a comma.
- FieldOfView (FieldOfView) <string>
- Min Search Dist (MinSearchDist) <integer>
- Max Search Dist (MaxSearchDist) <integer>
- Player pass issue time (freepass_timetotrigger) <float>
- Amount of time an enemy is hidden after which a 'free pass' on reaquire is granted.
- Player pass duration (freepass_duration) <float>
- After granted 'free pass', the amount of time a target is allowed before reaquire.
- Player pass move tolerance (freepass_movetolerance) <float>
- After granted 'free pass', the distance the target is allowed to move before reaquire.
- Player pass refill rate (freepass_refillrate) <float>
- After free pass begins expiring, how much the time the target gets back for every second they hide again.
- Player pass peek time (freepass_peektime) <float>
- How long targets in cover are allowed to peek without penalty.
- Start On (StartOn) <boolean>
Flags
ExpandBaseNPC flags
- 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.
- Do Alternate collision for this NPC (player avoidance) : [4096]
Note:This flag is disabled in 
episodic for player companions, because the 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
ExpandBaseNPC inputs
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 <targetnameRedirectInput/string>
- 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 <floatRedirectInput/float>
- Ignore danger sounds for the specified number of seconds.
- InsideTransition !FGD
- OutsideTransition !FGD
- SetBodyGroup <integerRedirectInput/integer>
- HACK: Sets this NPC's body group (from 0–n).
- SetEnemyFilter <stringRedirectInput/string>
- SetHealth <integerRedirectInput/integer>
- Set the NPC's health.
- SetMaxLookDistance <floatRedirectInput/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 <stringRedirectInput/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 <floatRedirectInput/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:
- SetDamageFilter <stringRedirectInput/string>
- Sets the entity to use as damage filter. Pass in an empty string (no parameter) to clear the damage filter.
Parentname:
- SetParent <stringRedirectInput/string>
- Move with this entity. See Entity Hierarchy (parenting).
- SetParentAttachment <stringRedirectInput/string>
- Change this entity to attach to a specific attachment point on its parent. The entity will teleport so that the position of its root bone matches that of the attachment. Entities must be parented before being sent this input.
- SetParentAttachmentMaintainOffset <stringRedirectInput/string>
- As above, but without teleporting. The entity retains its position relative to the attachment at the time of the input being received.
- ClearParent
- Removes this entity from the the movement hierarchy, leaving it free to move independently.
- TurnOn
- Turn on: Look for enemies.
- TurnOff
- Turn off: Stop looking for enemies.
Outputs
BaseNPC Outputs
Expand
- OnDamaged
- Fired when this NPC takes damage (!activator is the damage inflictor).
- OnDamagedByPlayer
- Fired when this NPC is hurt by a player (!activator is the attacker or vehicle driver [if friendly fire]).
- OnDamagedByPlayerSquad
- 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]).
- OnDeath
- Fired when this NPC is killed (!activator is the killer).
- OnDenyCommanderUse
- Fired when this NPC has refused to join the player's squad.
- OnForcedInteractionAborted
- Fired when the NPC aborts a forced interaction for some reason (target NPC died, couldn't be pathed to, etc.).
- OnForcedInteractionStarted
- Fired when the NPC starts a forced interaction.
- OnForcedInteractionFinished
- "NPCs in actbusies can no longer perform dynamic interactions."
Todo: What does this mean?
- OnHalfHealth
- Fired when this NPC reaches half of its maximum health.
- OnHearCombat
- Fired when this NPC hears combat sounds.
- OnHearPlayer
- Fired when this NPC hears the player.
- OnHearWorld
- Fired when this NPC hears a sound (other than combat or the player).
- OnFoundEnemy <targetname*RedirectOutput/ehandle>
- Fired when this NPC establishes line of sight to its enemy.
- OnLostEnemy
- 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.
- OnLostEnemyLOS
- Fired when this NPC loses line of sight to its enemy.
- OnFoundPlayer <targetname*RedirectOutput/ehandle>
- Fired when this NPC establishes line of sight to its enemy, and that enemy is a player.
- OnLostPlayer
- 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.
- OnLostPlayerLOS
- Fired when this NPC loses line of sight to its enemy, and that enemy is a player.
- OnSleep
- Fired when this NPC enters a sleep state.
- OnWake
- Fired when this NPC comes out of a sleep state.
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- OnLostEnemies
- Fires when the enemy finder has no enemies.
- OnAcquireEnemies
- Fires when the enemy finder acquires enemies.
See also
Black Mesa Steam versions, it is available only in 
Black Mesa (mod). Use func_tanktrain instead.
Class hierarchy
