Activating and Fixing AI In Coop Games: Difference between revisions

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=Introduction=
#REDIRECT [[Fixing AI in multiplayer]]
 
This article is an updated version (per 20-03-06) of the previous tutorial '''Activating AI In Coop Games'''.
Though the previous article allowed you to enable AI in multiplayer games, humanoid NPCs like ''Combine Soldiers'' could not attack the player. It is annoying, isn't it? Well, this is time to get over it!
 
=The Relationship Table=
 
==Creating the Table==
First of all, we should define the NPCs relationship table. Open the '''BaseEntity.h''' file, then in the '''enum Class_T''' definition, after the '''#elif defined( CSTRIKE_DLL )''' block, add this:
 
<pre>
//*** INITS NPCs' RELATION SHIP TABLE FOR HL2DM
#elif defined ( HL2MP_DLL || HL2MP )
// For CLASSIFY
enum Class_T
{
CLASS_NONE=0,
CLASS_PLAYER,
CLASS_PLAYER_ALLY,
CLASS_PLAYER_ALLY_VITAL,
CLASS_ANTLION,
CLASS_BARNACLE,
CLASS_BULLSEYE,
CLASS_CITIZEN_PASSIVE,
CLASS_CITIZEN_REBEL,
CLASS_COMBINE,
CLASS_COMBINE_GUNSHIP,
CLASS_CONSCRIPT,
CLASS_HEADCRAB,
CLASS_MANHACK,
CLASS_METROPOLICE,
CLASS_MILITARY,
CLASS_SCANNER,
CLASS_STALKER,
CLASS_VORTIGAUNT,
CLASS_ZOMBIE,
CLASS_PROTOSNIPER,
CLASS_MISSILE,
CLASS_FLARE,
CLASS_EARTH_FAUNA,
 
NUM_AI_CLASSES
};
//***
</pre>
 
==Loading the Table==
 
All right! Now we have to tell the Game Rules to use this relationship table when we start a HL2DM game.
Open the '''hl2mp_gamerules.h''' file. Under the '''public:''' tab, add this:
 
<pre>
//***INITS NPCs' RELATION SHIP TABLE FOR HL2DM
#ifndef CLIENT_DLL
void InitDefaultAIRelationships( void );
#endif
//***
</pre>
 
Now open the '''hl2mp_gamerules.cpp''' file. Then, at the very bottom of the file, add this piece of code:
<pre>
//------------------------------------------------------------------------------
// Purpose : Initialize all default class relationships
// Input  :
// Output  :
//------------------------------------------------------------------------------
//*** INITS NPCs' RELATION SHIP TABLE FOR HL2DM
#ifndef CLIENT_DLL
void CHL2MPRules::InitDefaultAIRelationships( void )
{
//Copy contents of the hl2_gamerules InitDefaultAIRelationships to here
}
#endif
//***
</pre>
 
Let's finish by adding this in the CHL2MPRules::CHL2MPRules() function:
 
<pre>
//***INITS NPCs' RELATION SHIP TABLE FOR HL2DM
InitDefaultAIRelationships();
//***
</pre>
 
=Making Humanoid NPCs Shoot=
==Weapons Animations Code==
First, find each weapon SP code ( located in the \dlls\hl2_dll\ folder ), then move all the animations declarations located in the SP-acttable_t function to the HL2MP-acttable_t structure. See example bellow:
 
<pre>
acttable_t CWeaponSMG1::m_acttable[] =
{
//HL2DM ANIMATIONS LIST START
{ ACT_HL2MP_IDLE, ACT_HL2MP_IDLE_SMG1, false },
( ... )
{ ACT_RANGE_ATTACK1, ACT_RANGE_ATTACK_SMG1, false },
//HL2MP ANIMATIONS LIST END
 
//HL2SP ANIMATIONS LIST START
{ ACT_RANGE_ATTACK1, ACT_RANGE_ATTACK_SMG1, true },
{ ACT_RELOAD, ACT_RELOAD_SMG1, true },
{ ACT_IDLE, ACT_IDLE_SMG1, true },
(...)
{ ACT_GESTURE_RELOAD, ACT_GESTURE_RELOAD_SMG1, true },
//HL2SP ANIMATIONS LIST END
 
}
</pre>
 
==Add AI-support to weapons==
Open the '''weapon_hl2mpbase.h''' file and add the following code before ''class CHL2MP_Player;'':
<pre>
#ifndef CLIENT_DLL
#include "AI_BaseNPC.h"
#endif
</pre>
 
==Other Weapons Modifications==
Now you have to edit each weapon code by adding a few lines of code in their class definition.
In each weapon class, add those declarations after something like the following code:
 
<pre>class CWeapon**** : public CBaseHL2MPCombatWeapon
{
public
</pre>
 
AFTER THIS CODE, add this one:
 
<pre>
#ifndef CLIENT_DLL
//ALLOW NPCS TO USE THE WEAPON TO SHOOT THEIR ENEMIES
int CapabilitiesGet( void ) { return bits_CAP_WEAPON_RANGE_ATTACK1; }
//HANDLES AI'S ACTIVITIES
void Operator_HandleAnimEvent( animevent_t *pEvent, CBaseCombatCharacter *pOperator );
#endif
</pre>
 
{{note|You will find the ''Operator_HandleAnimEvent()'' function body in the SP-code of the weapon. Thus, do not forget to copy/paste it to avoid compiling errors! If the function already exists, keep it. Also place the function between the if shown in the previous code-example.}}
 
==Models Activity Fix==
It has been suggested on some forums to modify the ''SetActivity()'' function code.
Thus, in the '''basecombatweapon_shared.cpp''' file, find the ''SetActivity()'' function, and then replace:
 
<pre>
//Adrian: Oh man...
#if !defined( CLIENT_DLL ) && defined( HL2MP )
SetModel( GetWorldModel() );
#endif
</pre>
 
with
 
<pre>
if ( GetOwner()->IsPlayer() )
SetModel( GetWorldModel() );
</pre>
 
Proceed similarily after the other comment, so you replace:
 
<pre>
//Adrian: Oh man again...
#if !defined( CLIENT_DLL ) && defined( HL2MP )
SetModel( GetViewModel() );
#endif
</pre>
 
with
 
<pre>
if ( GetOwner()->IsPlayer() )
SetModel( GetViewModel() );
</pre>
According to Garry, it fixes animation not playing correctly
==Reducing Network traffic==
See [[CBaseFlex]] for reason of the following modification
===src\dlls\BaseFlex.h===
Replace <code>CNetworkArray( float, m_flexWeight, 64 );</code> with <code>CNetworkArrayForDerived( float, m_flexWeight, 64 );</code>
 
<code>CNetworkArrayForDerived</code> will allow you to send m_flexWeight to the client for derived classes if needed (acting NPCs)
 
===src\dlls\BaseFlex.cpp===
Remove:
SendPropArray3 (SENDINFO_ARRAY3(m_flexWeight), SendPropFloat(SENDINFO_ARRAY(m_flexWeight), 12, SPROP_ROUNDDOWN, 0.0f, 1.0f ) ),
Replace <code>m_flexWeight.Set( index, value );</code> with <code>m_flexWeight[index] = value;</code>
 
==Ammotypes==
Well, if the NPCs kill you instantly, here's the tip to fix it. In the '''hl2mp_gamerules.cpp''' file, replace the whole ''CAmmoDef *GetAmmoDef()'' function to this:
 
<pre>
CAmmoDef *GetAmmoDef()
{
static CAmmoDef def;
static bool bInitted = false;
if ( !bInitted )
{
bInitted = true;
 
//*** HL2SP DEFINITIONS
def.AddAmmoType("AR2", DMG_BULLET, TRACER_LINE_AND_WHIZ, "sk_plr_dmg_ar2", "sk_npc_dmg_ar2", "sk_max_ar2", BULLET_IMPULSE(200, 1225), 0 );
def.AddAmmoType("AlyxGun", DMG_BULLET, TRACER_LINE, "sk_plr_dmg_alyxgun", "sk_npc_dmg_alyxgun", "sk_max_alyxgun", BULLET_IMPULSE(200, 1225), 0 );
def.AddAmmoType("Pistol", DMG_BULLET, TRACER_LINE_AND_WHIZ, "sk_plr_dmg_pistol", "sk_npc_dmg_pistol", "sk_max_pistol", BULLET_IMPULSE(200, 1225), 0 );
def.AddAmmoType("SMG1", DMG_BULLET, TRACER_LINE_AND_WHIZ, "sk_plr_dmg_smg1", "sk_npc_dmg_smg1", "sk_max_smg1", BULLET_IMPULSE(200, 1225), 0 );
def.AddAmmoType("357", DMG_BULLET, TRACER_LINE_AND_WHIZ, " sk_plr_dmg_357", "sk_npc_dmg_357", "sk_max_357", BULLET_IMPULSE(800, 5000), 0 );
def.AddAmmoType("XBowBolt", DMG_BULLET, TRACER_LINE, "sk_plr_dmg_crossbow", "sk_npc_dmg_crossbow", "sk_max_crossbow", BULLET_IMPULSE(800, 8000), 0 );
 
def.AddAmmoType("Buckshot", DMG_BULLET | DMG_BUCKSHOT, TRACER_LINE, "sk_plr_dmg_buckshot", "sk_npc_dmg_buckshot", "sk_max_buckshot", BULLET_IMPULSE(400, 1200), 0 );
def.AddAmmoType("RPG_Round", DMG_BURN, TRACER_NONE, "sk_plr_dmg_rpg_round", "sk_npc_dmg_rpg_round", "sk_max_rpg_round", 0, 0 );
def.AddAmmoType("SMG1_Grenade", DMG_BURN, TRACER_NONE, "sk_plr_dmg_smg1_grenade", "sk_npc_dmg_smg1_grenade", "sk_max_smg1_grenade", 0, 0 );
def.AddAmmoType("Grenade", DMG_BURN, TRACER_NONE, "sk_plr_dmg_grenade", "sk_npc_dmg_grenade", "sk_max_grenade", 0, 0);
def.AddAmmoType("Thumper", DMG_SONIC, TRACER_NONE, 10, 10, 2, 0, 0 );
def.AddAmmoType("Gravity", DMG_CLUB, TRACER_NONE, 0, 0, 8, 0, 0 );
def.AddAmmoType("Battery", DMG_CLUB, TRACER_NONE, NULL, NULL, NULL, 0, 0 );
def.AddAmmoType("GaussEnergy", DMG_SHOCK, TRACER_NONE, "sk_jeep_gauss_damage", "sk_jeep_gauss_damage", "sk_max_gauss_round", BULLET_IMPULSE(650, 8000), 0 ); // hit like a 10kg weight at 400 in/s
def.AddAmmoType("CombineCannon", DMG_BULLET, TRACER_LINE, "sk_npc_dmg_gunship_to_plr", "sk_npc_dmg_gunship", NULL, 1.5 * 750 * 12, 0 ); // hit like a 1.5kg weight at 750 ft/s
def.AddAmmoType("AirboatGun", DMG_AIRBOAT, TRACER_LINE, "sk_plr_dmg_airboat", "sk_npc_dmg_airboat", NULL, BULLET_IMPULSE(10, 600), 0 );
def.AddAmmoType("StriderMinigun", DMG_BULLET, TRACER_LINE, 5, 5, 15, 1.0 * 750 * 12, AMMO_FORCE_DROP_IF_CARRIED ); // hit like a 1.0kg weight at 750 ft/s
def.AddAmmoType("HelicopterGun", DMG_BULLET, TRACER_LINE_AND_WHIZ, "sk_npc_dmg_helicopter_to_plr", "sk_npc_dmg_helicopter", "sk_max_smg1", BULLET_IMPULSE(400, 1225), AMMO_FORCE_DROP_IF_CARRIED | AMMO_INTERPRET_PLRDAMAGE_AS_DAMAGE_TO_PLAYER );
def.AddAmmoType("AR2AltFire", DMG_DISSOLVE, TRACER_NONE, 0, 0, "sk_max_ar2_altfire", 0, 0 );
//***
}
 
return &def;
}
</pre>
 
=Let's Finish=
 
==Import skills data==
Few people noticed that NPCs were not causing any damage to the player and/or that they could die instantly.
This issue is simply caused by the fact the file '''skill.cfg''' is missing from the ''"\cfg"'' directory in the mod-dir.
To fix it, get the '''skill.cfg''' file located in the Half-Lfe 2 folder.
 
==Models Animations==
You have to replace the HL2DM NPCS animations by the HL2 ones. Indeed HL2DM overrides the NPCs animations - ''used for the player models'' - so it breaks the AI. Thus, you will have to use other models files for the players. You should hexedit the HL2DM player models & the animations to make it tight. You will also have to put the HL2 original models in your ''\models'' folder.
Finally, do not forget to modify the code related to the player models list in the '''hl2mp_player.cpp''' file.
 
If you don't want to waste time hex-editing the model files one by one, then you can download the whole package [http://dolphineye.ifrance.com/ here ].
 
=== Fixing other enemies/NPCs ===
For example, the hopper still won't work. Normally hoppers are only used when there's 1 player in the game and it's code should be edited for multiple players. The same goes for citizens.
 
== Late Precaching ==
You may notice that you keep getting assertions if you are running in debug mode. In order to fix this, the best is to add a call to PRECACHE_REGISTER underneath the area where you link an entity to a class. For example, for npc_zombie one would place PRECACHE_REGISTER( npc_zombie ); underneath LINK_ENTITY_TO_CLASS( npc_zombie, CZombie ) in '''npc_zombie.cpp'''
 
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{{otherlang:en:fr|{{PAGENAME}}:fr}}
 
[[Category:Programming]]

Latest revision as of 15:21, 17 May 2008

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