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  GM:ScaleNPCDamage( NPC npc, number hitgroup, CTakeDamageInfo dmginfo )
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Description

Called when an NPC takes damage.

This hook is called only when a specific hit group of the NPC is hit. In cases where the hitgroup doesn't matter, you should use GM:EntityTakeDamage instead!

Arguments

1 NPC npc
The NPC that takes damage
2 number hitgroup
The hitgroup (hitbox) enum where the NPC took damage. See HITGROUP enum
3 CTakeDamageInfo dmginfo
Damage info

Example

Double the damage whenever an NPC is hurt.

hook.Add( "ScaleNPCDamage", "ScaleNPCDamageExample", function( npc, hitgroup, dmginfo ) dmginfo:ScaleDamage( 2 ) end )

Example

Mimic Half-Life 2 behaviour, in the context of a gamemode.

Running this code from an addon is not advised, as you'd have to stop all other hooks from running, potentially breaking other addons or the gamemode, or be applying the damage on top of the gamemode's scaling, resulting in unwanted issues like 4x or 6x headshot damage in Sandbox.

function GetNPCDamageMultiplier( npc, iHitGroup, dmginfo ) if ( iHitGroup == HITGROUP_GEAR ) then -- HL2 also sets the hitgroup to GENERIC here, but we cannot return 0.01 elseif ( iHitGroup == HITGROUP_HEAD ) then -- Some NPCs have unique behaviors if ( npc:GetClass() == "npc_combine_s" ) then return 2 elseif ( npc:GetClass() == "npc_zombie" || npc:GetClass() == "npc_zombine" || npc:GetClass() == "npc_fastzombie" || npc:GetClass() == "npc_poisonzombie" || npc:GetClass() == "npc_zombie_torso" || npc:GetClass() == "npc_fastzombie_torso" ) then if ( bit.band( dmginfo:GetDamageType(), DMG_BUCKSHOT ) != 0 ) then if ( IsValid( dmginfo:GetAttacker() ) ) then local flDist = ( npc:GetPos() - dmginfo:GetAttacker():GetPos() ):Length() if ( flDist <= 96 ) then return 3 end end else return 2 end end return GetConVarNumber( "sk_npc_head" ) elseif ( iHitGroup == HITGROUP_CHEST ) then return GetConVarNumber( "sk_npc_chest" ) elseif ( iHitGroup == HITGROUP_STOMACH ) then return GetConVarNumber( "sk_npc_stomach" ) elseif ( iHitGroup == HITGROUP_LEFTARM || iHitGroup == HITGROUP_RIGHTARM ) then return GetConVarNumber( "sk_npc_arm" ) elseif ( iHitGroup == HITGROUP_LEFTLEG || iHitGroup == HITGROUP_RIGHTLEG ) then return GetConVarNumber( "sk_npc_leg" ) end -- No change in damage --return 1 end function GM:ScaleNPCDamage( npc, hitgroup, dmginfo ) local damageScale = GetNPCDamageMultiplier( npc, hitgroup, dmginfo ) if ( damageScale ) then dmginfo:ScaleDamage( damageScale ) end end

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