<function name="ScaleNPCDamage" parent="GM" type="hook"> <description> Called when an NPC takes damage. <note>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 <page>GM:EntityTakeDamage</page> instead!</note> </description> <realm>Server</realm> <args> <arg name="npc" type="NPC">The NPC that takes damage</arg> <arg name="hitgroup" type="number">The hitgroup (hitbox) enum where the NPC took damage. See <page>Enums/HITGROUP</page></arg> <arg name="dmginfo" type="CTakeDamageInfo">Damage info</arg> </args> </function> <example> <description>Double the damage whenever an NPC is hurt.</description> <code> hook.Add( "ScaleNPCDamage", "ScaleNPCDamageExample", function( npc, hitgroup, dmginfo ) dmginfo:ScaleDamage( 2 ) end ) </code> ⤶ </example>⤶ ⤶ <example>⤶ <description>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.</description>⤶ <code>⤶ 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⤶ </code>⤶ </example>