npc_antlionguard

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Antlion Guard - click to enlarge.
Cavern Dweller (New with Source 2006) - click to enlarge.

<Half-Life 2> npc_antlionguard is a point entity available in the Half-Life 2 series. The Antlion guard is a much larger and more dangerous form of antlion. The guard has a significant amount of health, and can fling physics objects at the player.

The cavern guard does not charge or roar and predicts where the player will be for melee attack.

Note:Some keyvalues, flags, inputs, or outputs might not affect an NPC, based on the functionality and coding of the NPC.

Dedicated Console Variables

sk_antlionguard_health <int>
An antlion guard's spawn health
sk_antlionguard_dmg_charge <int>
Damage the antlion guard deals when it hits the player while charging.
sk_antlionguard_dmg_shove <int>
Damage the antlion guard deals when it hits the player with the standard, shove attack.
sk_antlionguard_dmg_take_scale <int>
Scale of how much damage the antlion guard takes if damaged.

Keyvalues

BaseNPC:

Relationship <string> !FGD
<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. This keyvalue is not included in Valve's FGDs.

Values for disposition are:
  • D_HT: Hate
  • D_FR: Fear
  • D_LI: Like
  • D_NU: Neutral
Target Path Corner <targetname>
The path_corner that this NPC will move to after spawning.
Squad Name <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 <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 <boolean>
Limits NPC to using specified hint group for navigation requests, but does not limit local navigation.
Sleep State <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 <float>
Auto-wake if player within this distance
Wake Squad <boolean>
Wake all of the NPCs squadmates if the NPC is woken
Enemy Filter <targetname>
Filter entity to test targets against
Ignore unseen enemies <boolean>
Prefer visible enemies, regardless of distance or relationship priority
Physics Impact Damage Scale <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:

Damage Filter <targetname>
Name of the filter_damage_type entity that controls which entities can damage us.

ResponseContext:

Response Contexts <string>
Pre-defined response system contexts for this entity. Format is key:value,key:value,...

Shadow:

Disable shadows <boolean>
Prevent the entity from creating cheap render-to-texture shadows. Does not affect shadow mapping.
Disable ShadowDepth <boolean> (New with Portal 2)
Used to disable rendering into shadow depth (for projected textures) for this entity.
Projected Texture Cache <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
Disable flashlight <boolean> (New with Portal 2)
Used to disable projected texture lighting and shadows on this entity.

RenderFields:

Render Mode (rendermode) <choices>
Set a non-standard rendering mode on this entity.
Render FX / Transparency (0 - 255) (renderamt) <integer>
Transparency amount, requires a Render Mode other than Normal. 0 is invisible, 255 is fully visible.
Render Color (R G B) (rendercolor) <color255>
Color tint.
Disable Receiving Shadows (disablereceiveshadows) <boolean>
Prevent the entity from receiving shadows on itself.

RenderFXChoices:

Render FX (renderfx) <choices>
Preset pattern of appearance effects.
To do: 18-21, 25

Angles:

Pitch Yaw Roll (Y Z X) <angle>
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.

Targetname:

Name <string>
The targetname that other entities refer to this entity by.
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.
Start burrowed <boolean>
Start the NPC burrowed under the ground, waiting for the player to appear.
Allow bark <boolean>
Sometimes the Antlionguard will call other antlions to unburrow near it. Generally 3 antlions per bark.
Cavern breed <boolean>
Sets the guard to use the Episode Two Cavern Guard skin.
In Cavern <boolean>
If set, the guard will do poison damage and will not charge or roar.

Flags

  • 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 point_template.
  • 4096: Do Alternate collision for this NPC (player avoidance)
    Note:This flag is disabled in episodic for player companions because the StartScripting input does this.
  • 8192: Don't drop weapons
  • 16384: Ignore player push (New with Source 2006): Don't give way to player
  • 65536 : Create server-side ragdoll on death
  • 131072 : Use inside footsteps

Inputs

BaseNPC:

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: Hate
  • D_FR: Fear
  • D_LI: Like
  • D_NU: Neutral
SetHealth <int>
Set the NPC's health.
AddHealth <int> (New with Source 2007)
RemoveHealth <int> (New with Source 2007)
Add to or remove from the NPC's health.
SetBodyGroup  <integer>
HACK: Sets this NPC's body group (from 0 - n).
physdamagescale  <float>
Scales the damage taken when this character is hit by a physics object. 0 means this feature is disabled for backwards compatibility.
Ignite
Burst into flames.
IgniteLifetime  <float>
Ignite for the given number of seconds.
IgniteNumHitboxFires  <integer>
Ignite with the given number of hitbox fires.
IgniteHitboxFireScale  <float>
Ignite with the given hitbox fire scale.
Break
Smash into pieces. If this is not possible, disappear.
BecomeRagdoll  (New with Source 2007)
Remove itself and instantly become a ragdoll with zero force (just go limp). OnDeath, etc. Outputs will NOT be fired.
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 NPC's idle speech, and so on.
Assault  <targetname>
Start an assault at the given rally point.
SetSquad  <string>
Change the name of this NPC's squad. Leaving the parameter blank will remove the NPC from any existing squad.
Wake
Wakes up the NPC if it is sleeping.
ForgetEntity  <targetname>
Clears out the NPC's knowledge of a named entity.
GagEnable
GagDisable
Gagged NPCs won't speak (or moan, caw, etc.) unless made to be a choreographed scene.
IgnoreDangerSounds  <float>
Ignore danger sounds for the specified number of seconds.
HolsterWeapon (New with Source 2006)
UnholsterWeapon (New with 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 Source 2006)
As HolsterWeapon, except the weapon is destroyed once it has been concealed.
ForceInteractionWithNPC <string(New with Source 2006)  <string>
Force the NPC to use a dynamic interaction with another NPC. Syntax is <targetname> <dynamic interaction>.
UpdateEnemyMemory (New with Source 2006)
Update (or create) this NPC's memory of of the given entity.

RenderFields:

Alpha  <integer>
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 0.
Color  <color255>
Sets an RGB color for the entity.

DamageFilter:

SetDamageFilter  <string>
Sets the entity to use as damage filter. Pass in an empty string (no parameter) to clear the damage filter.

ResponseContext:

AddContext <string>
Adds to the entity's list of response contexts. Format is <key>:<value>.
RemoveContext <string>
Remove a context from this entity's list. The name should match the key of an existing context.
ClearContext
Removes all contexts from this entity's list.

Shadow:

DisableShadow
Turn shadow off.
EnableShadow
Turn shadow on.
DisableReceivingFlashlight  (New with Portal 2)
This object will not receive light or shadows from projected textures.
EnableReceivingFlashlight  (New with Portal 2)
This object may receive light or shadows from projected textures.

Targetname:

Kill
Removes this entity and any entities parented to it from the world.
KillHierarchy
Functions the same as Kill, although entities with a large number of children are killed marginally faster.
AddOutput  <string>
Evaluates a keyvalue/output on this entity. It can be potentially very dangerous, use with care.
Format: <key> <value>
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. Can also be invoked by creating an output that does not specify an input.
This input is not included in Valve's FGDs.
RunScriptFile  <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.
RunScriptCode  <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 <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: 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> (New with Left 4 Dead 2) !FGD
Execute a VScript function in the scope of the receiving entity.
Note:This input is missing from some games FGD files.
SetLocalOrigin  <origin> (New with Alien Swarm) !FGD
Set this entity's origin in the map.
Note:This input is missing from some games FGD files.
SetLocalAngles  <angles> (New with Alien Swarm) !FGD
Set this entity's angles in the map.
Note:This input is missing from some games FGD files.
Unburrow
Unburrow from the ground.
SetShoveTarget  <targetname>
Sets a shove target to attack.
SetChargeTarget  <targetname>
Sets a charge target to attack.
ClearChargeTarget
Clear the charge target.
Ragdoll
Causes the antlion guard to die, regardless of health.
EnableBark
Allow the antlion guard to try and summon antlions.
DisableBark
Stop the antlion guard from trying to summon antlions.
StopInvestigating
Stop trying to sniff out the player.(Non-functional)
EnablePreferPhysicsAttack
Prefer to use physics attacks if at all possible, even when inside a cavern.(The guard will still prioritize charging).
DisablePreferPhysicsAttack
Do not prefer to use physics attacks if at all possible, even when inside a cavern.

Outputs

BaseNPC:

OnDamaged
Fired when this NPC takes damage (activator is the damage inflictor)
OnDeath
Fired when this NPC is killed (activator is the killer)
OnHalfHealth
Fired when this NPC reaches half of its maximum health
OnHearWorld
Fired when this NPC hears a sound (other than combat or the player)
OnHearPlayer
Fired when this NPC hears the player
OnHearCombat
Fired when this NPC hears combat sounds
OnFoundEnemy  <targetname>
Fired when this NPC establishes line of sight to its enemy
OnLostEnemyLOS
Fired when this NPC loses 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
OnFoundPlayer  <targetname>
Fired when this NPC establishes line of sight to its enemy, and that enemy is a player
OnLostPlayerLOS
Fired when this NPC loses 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
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))
OnDenyCommanderUse
Fired when this NPC has refused to join the player's squad
OnSleep
Fired when this NPC enters a sleep state
OnWake
Fired when this NPC comes out of a sleep state
OnForcedInteractionStarted
Fired when the NPC starts a forced interaction.
OnForcedInteractionAborted
Fired when the NPC aborts a forced interaction for some reason (target NPC died, couldn't be pathed to, etc)
OnForcedInteractionFinished
"NPCs in actbusies can no longer perform dynamic interactions." To do: What does this mean?

Targetname:

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  (New with Left 4 Dead)
This Output fires when the entity is killed and removed from the game.
OnSeeHiddenPlayer
Fires when the current enemy is seen while trying to hide.(Non-functional)
OnSmellHiddenPlayer
Fires when the current enemy is smelled while trying to hide.(Non-functional)
OnSummon
Antlion guard is attempting to summon antlions.

See also