First version of the SOurce SDK 2013

1 files changed, 3023 insertions, 0 deletions

diff --git a/mp/src/game/server/hl2/npc_BaseZombie.cpp b/mp/src/game/server/hl2/npc_BaseZombie.cpp
new file mode 100644
index 00000000..39646480
--- /dev/null
+++ b/mp/src/game/server/hl2/npc_BaseZombie.cpp
@@ -0,0 +1,3023 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//

+//

+// Purpose: Implements the zombie, a horrific once-human headcrab victim.

+//

+// The zombie has two main states: Full and Torso.

+//

+// In Full state, the zombie is whole and walks upright as he did in Half-Life.

+// He will try to claw the player and swat physics items at him. 

+//

+// In Torso state, the zombie has been blasted or cut in half, and the Torso will

+// drag itself along the ground with its arms. It will try to claw the player.

+//

+// In either state, a severely injured Zombie will release its headcrab, which

+// will immediately go after the player. The Zombie will then die (ragdoll). 

+//

+//=============================================================================//

+

+#include "cbase.h"

+#include "npc_BaseZombie.h"

+#include "player.h"

+#include "game.h"

+#include "ai_network.h"

+#include "ai_navigator.h"

+#include "ai_motor.h"

+#include "ai_default.h"

+#include "ai_schedule.h"

+#include "ai_hull.h"

+#include "ai_node.h"

+#include "ai_memory.h"

+#include "ai_senses.h"

+#include "bitstring.h"

+#include "EntityFlame.h"

+#include "hl2_shareddefs.h"

+#include "npcevent.h"

+#include "activitylist.h"

+#include "entitylist.h"

+#include "gib.h"

+#include "soundenvelope.h"

+#include "ndebugoverlay.h"

+#include "rope.h"

+#include "rope_shared.h"

+#include "igamesystem.h"

+#include "vstdlib/random.h"

+#include "engine/IEngineSound.h"

+#include "props.h"

+#include "hl2_gamerules.h"

+#include "weapon_physcannon.h"

+#include "ammodef.h"

+#include "vehicle_base.h"

+ 

+// memdbgon must be the last include file in a .cpp file!!!

+#include "tier0/memdbgon.h"

+

+extern ConVar sk_npc_head;

+

+#define ZOMBIE_BULLET_DAMAGE_SCALE 0.5f

+

+int g_interactionZombieMeleeWarning;

+

+envelopePoint_t envDefaultZombieMoanVolumeFast[] =

+{

+	{	1.0f, 1.0f,

+		0.1f, 0.1f,

+	},

+	{	0.0f, 0.0f,

+		0.2f, 0.3f,

+	},

+};

+

+envelopePoint_t envDefaultZombieMoanVolume[] =

+{

+	{	1.0f, 0.1f,

+		0.1f, 0.1f,

+	},

+	{	1.0f, 1.0f,

+		0.2f, 0.2f,

+	},

+	{	0.0f, 0.0f,

+		0.3f, 0.4f,

+	},

+};

+

+

+// if the zombie doesn't find anything closer than this, it doesn't swat.

+#define ZOMBIE_FARTHEST_PHYSICS_OBJECT	40.0*12.0

+#define ZOMBIE_PHYSICS_SEARCH_DEPTH	100

+

+// Don't swat objects unless player is closer than this.

+#define ZOMBIE_PLAYER_MAX_SWAT_DIST		1000

+

+//

+// How much health a Zombie torso gets when a whole zombie is broken

+// It's whole zombie's MAX Health * this value

+#define ZOMBIE_TORSO_HEALTH_FACTOR 0.5

+

+//

+// When the zombie has health < m_iMaxHealth * this value, it will

+// try to release its headcrab.

+#define ZOMBIE_RELEASE_HEALTH_FACTOR	0.5

+

+//

+// The heaviest physics object that a zombie should try to swat. (kg)

+#define ZOMBIE_MAX_PHYSOBJ_MASS		60

+

+//

+// Zombie tries to get this close to a physics object's origin to swat it

+#define ZOMBIE_PHYSOBJ_SWATDIST		80

+

+//

+// Because movement code sometimes doesn't get us QUITE where we

+// want to go, the zombie tries to get this close to a physics object

+// Zombie will end up somewhere between PHYSOBJ_MOVE_TO_DIST & PHYSOBJ_SWATDIST

+#define ZOMBIE_PHYSOBJ_MOVE_TO_DIST	48

+

+//

+// How long between physics swat attacks (in seconds). 

+#define ZOMBIE_SWAT_DELAY			5

+

+

+//

+// After taking damage, ignore further damage for n seconds. This keeps the zombie

+// from being interrupted while.

+//

+#define ZOMBIE_FLINCH_DELAY			3

+

+

+#define ZOMBIE_BURN_TIME		10 // If ignited, burn for this many seconds

+#define ZOMBIE_BURN_TIME_NOISE	2  // Give or take this many seconds.

+

+

+//=========================================================

+// private activities

+//=========================================================

+int CNPC_BaseZombie::ACT_ZOM_SWATLEFTMID;

+int CNPC_BaseZombie::ACT_ZOM_SWATRIGHTMID;

+int CNPC_BaseZombie::ACT_ZOM_SWATLEFTLOW;

+int CNPC_BaseZombie::ACT_ZOM_SWATRIGHTLOW;

+int CNPC_BaseZombie::ACT_ZOM_RELEASECRAB;

+int CNPC_BaseZombie::ACT_ZOM_FALL;

+

+ConVar	sk_zombie_dmg_one_slash( "sk_zombie_dmg_one_slash","0");

+ConVar	sk_zombie_dmg_both_slash( "sk_zombie_dmg_both_slash","0");

+

+

+// When a zombie spawns, he will select a 'base' pitch value

+// that's somewhere between basepitchmin & basepitchmax

+ConVar zombie_basemin( "zombie_basemin", "100" );

+ConVar zombie_basemax( "zombie_basemax", "100" );

+

+ConVar zombie_changemin( "zombie_changemin", "0" );

+ConVar zombie_changemax( "zombie_changemax", "0" );

+

+// play a sound once in every zombie_stepfreq steps

+ConVar zombie_stepfreq( "zombie_stepfreq", "4" );

+ConVar zombie_moanfreq( "zombie_moanfreq", "1" );

+

+ConVar zombie_decaymin( "zombie_decaymin", "0.1" );

+ConVar zombie_decaymax( "zombie_decaymax", "0.4" );

+

+ConVar zombie_ambushdist( "zombie_ambushdist", "16000" );

+

+//=========================================================

+// For a couple of reasons, we keep a running count of how

+// many zombies in the world are angry at any given time.

+//=========================================================

+static int s_iAngryZombies = 0;

+

+//=========================================================

+//=========================================================

+class CAngryZombieCounter : public CAutoGameSystem

+{

+public:

+	CAngryZombieCounter( char const *name ) : CAutoGameSystem( name )

+	{

+	}

+	// Level init, shutdown

+	virtual void LevelInitPreEntity()

+	{

+		s_iAngryZombies = 0;

+	}

+};

+

+CAngryZombieCounter	AngryZombieCounter( "CAngryZombieCounter" );

+

+

+int AE_ZOMBIE_ATTACK_RIGHT;

+int AE_ZOMBIE_ATTACK_LEFT;

+int AE_ZOMBIE_ATTACK_BOTH;

+int AE_ZOMBIE_SWATITEM;

+int AE_ZOMBIE_STARTSWAT;

+int AE_ZOMBIE_STEP_LEFT;

+int AE_ZOMBIE_STEP_RIGHT;

+int AE_ZOMBIE_SCUFF_LEFT;

+int AE_ZOMBIE_SCUFF_RIGHT;

+int AE_ZOMBIE_ATTACK_SCREAM;

+int AE_ZOMBIE_GET_UP;

+int AE_ZOMBIE_POUND;

+int AE_ZOMBIE_ALERTSOUND;

+int AE_ZOMBIE_POPHEADCRAB;

+

+

+//=========================================================

+//=========================================================

+BEGIN_DATADESC( CNPC_BaseZombie )

+

+	DEFINE_SOUNDPATCH( m_pMoanSound ),

+	DEFINE_FIELD( m_fIsTorso, FIELD_BOOLEAN ),

+	DEFINE_FIELD( m_fIsHeadless, FIELD_BOOLEAN ),

+	DEFINE_FIELD( m_flNextFlinch, FIELD_TIME ),

+	DEFINE_FIELD( m_bHeadShot, FIELD_BOOLEAN ),

+	DEFINE_FIELD( m_flBurnDamage, FIELD_FLOAT ),

+	DEFINE_FIELD( m_flBurnDamageResetTime, FIELD_TIME ),

+	DEFINE_FIELD( m_hPhysicsEnt, FIELD_EHANDLE ),

+	DEFINE_FIELD( m_flNextMoanSound, FIELD_TIME ),

+	DEFINE_FIELD( m_flNextSwat, FIELD_TIME ),

+	DEFINE_FIELD( m_flNextSwatScan, FIELD_TIME ),

+	DEFINE_FIELD( m_crabHealth, FIELD_FLOAT ),

+	DEFINE_FIELD( m_flMoanPitch, FIELD_FLOAT ),

+	DEFINE_FIELD( m_iMoanSound, FIELD_INTEGER ),

+	DEFINE_FIELD( m_hObstructor, FIELD_EHANDLE ),

+	DEFINE_FIELD( m_bIsSlumped, FIELD_BOOLEAN ),

+

+END_DATADESC()

+

+

+//LINK_ENTITY_TO_CLASS( base_zombie, CNPC_BaseZombie );

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+int CNPC_BaseZombie::g_numZombies = 0;

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+CNPC_BaseZombie::CNPC_BaseZombie()

+{

+	// Gotta select which sound we're going to play, right here!

+	// Because everyone's constructed before they spawn.

+	//

+	// Assign moan sounds in order, over and over.

+	// This means if 3 or so zombies spawn near each

+	// other, they will definitely not pick the same

+	// moan loop.

+	m_iMoanSound = g_numZombies;

+

+	g_numZombies++;

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+CNPC_BaseZombie::~CNPC_BaseZombie()

+{

+	g_numZombies--;

+}

+

+

+//---------------------------------------------------------

+// The closest physics object is chosen that is:

+// <= MaxMass in Mass

+// Between the zombie and the enemy

+// not too far from a direct line to the enemy.

+//---------------------------------------------------------

+bool CNPC_BaseZombie::FindNearestPhysicsObject( int iMaxMass )

+{

+	CBaseEntity		*pList[ ZOMBIE_PHYSICS_SEARCH_DEPTH ];

+	CBaseEntity		*pNearest = NULL;

+	float			flDist;

+	IPhysicsObject	*pPhysObj;

+	int				i;

+	Vector			vecDirToEnemy;

+	Vector			vecDirToObject;

+

+	if ( !CanSwatPhysicsObjects() || !GetEnemy() )

+	{

+		// Can't swat, or no enemy, so no swat.

+		m_hPhysicsEnt = NULL;

+		return false;

+	}

+

+	vecDirToEnemy = GetEnemy()->GetAbsOrigin() - GetAbsOrigin();

+	float dist = VectorNormalize(vecDirToEnemy);

+	vecDirToEnemy.z = 0;

+

+	if( dist > ZOMBIE_PLAYER_MAX_SWAT_DIST )

+	{

+		// Player is too far away. Don't bother 

+		// trying to swat anything at them until

+		// they are closer.

+		return false;

+	}

+

+	float flNearestDist = MIN( dist, ZOMBIE_FARTHEST_PHYSICS_OBJECT * 0.5 );

+	Vector vecDelta( flNearestDist, flNearestDist, GetHullHeight() * 2.0 );

+

+	class CZombieSwatEntitiesEnum : public CFlaggedEntitiesEnum

+	{

+	public:

+		CZombieSwatEntitiesEnum( CBaseEntity **pList, int listMax, int iMaxMass )

+		 :	CFlaggedEntitiesEnum( pList, listMax, 0 ),

+			m_iMaxMass( iMaxMass )

+		{

+		}

+

+		virtual IterationRetval_t EnumElement( IHandleEntity *pHandleEntity )

+		{

+			CBaseEntity *pEntity = gEntList.GetBaseEntity( pHandleEntity->GetRefEHandle() );

+			if ( pEntity && 

+				 pEntity->VPhysicsGetObject() && 

+				 pEntity->VPhysicsGetObject()->GetMass() <= m_iMaxMass && 

+				 pEntity->VPhysicsGetObject()->IsAsleep() && 

+				 pEntity->VPhysicsGetObject()->IsMoveable() )

+			{

+				return CFlaggedEntitiesEnum::EnumElement( pHandleEntity );

+			}

+			return ITERATION_CONTINUE;

+		}

+

+		int m_iMaxMass;

+	};

+

+	CZombieSwatEntitiesEnum swatEnum( pList, ZOMBIE_PHYSICS_SEARCH_DEPTH, iMaxMass );

+

+	int count = UTIL_EntitiesInBox( GetAbsOrigin() - vecDelta, GetAbsOrigin() + vecDelta, &swatEnum );

+

+	// magically know where they are

+	Vector vecZombieKnees;

+	CollisionProp()->NormalizedToWorldSpace( Vector( 0.5f, 0.5f, 0.25f ), &vecZombieKnees );

+

+	for( i = 0 ; i < count ; i++ )

+	{

+		pPhysObj = pList[ i ]->VPhysicsGetObject();

+

+		Assert( !( !pPhysObj || pPhysObj->GetMass() > iMaxMass || !pPhysObj->IsAsleep() ) );

+

+		Vector center = pList[ i ]->WorldSpaceCenter();

+		flDist = UTIL_DistApprox2D( GetAbsOrigin(), center );

+

+		if( flDist >= flNearestDist )

+			continue;

+

+		// This object is closer... but is it between the player and the zombie?

+		vecDirToObject = pList[ i ]->WorldSpaceCenter() - GetAbsOrigin();

+		VectorNormalize(vecDirToObject);

+		vecDirToObject.z = 0;

+

+		if( DotProduct( vecDirToEnemy, vecDirToObject ) < 0.8 )

+			continue;

+

+		if( flDist >= UTIL_DistApprox2D( center, GetEnemy()->GetAbsOrigin() ) )

+			continue;

+

+		// don't swat things where the highest point is under my knees

+		// NOTE: This is a rough test; a more exact test is going to occur below

+		if ( (center.z + pList[i]->BoundingRadius()) < vecZombieKnees.z )

+			continue;

+

+		// don't swat things that are over my head.

+		if( center.z > EyePosition().z )

+			continue;

+

+		vcollide_t *pCollide = modelinfo->GetVCollide( pList[i]->GetModelIndex() );

+		

+		Vector objMins, objMaxs;

+		physcollision->CollideGetAABB( &objMins, &objMaxs, pCollide->solids[0], pList[i]->GetAbsOrigin(), pList[i]->GetAbsAngles() );

+

+		if ( objMaxs.z < vecZombieKnees.z )

+			continue;

+

+		if ( !FVisible( pList[i] ) )

+			continue;

+

+		if ( hl2_episodic.GetBool() )

+		{

+			// Skip things that the enemy can't see. Do we want this as a general thing? 

+			// The case for this feature is that zombies who are pursuing the player will

+			// stop along the way to swat objects at the player who is around the corner or 

+			// otherwise not in a place that the object has a hope of hitting. This diversion

+			// makes the zombies very late (in a random fashion) getting where they are going. (sjb 1/2/06)

+			if( !GetEnemy()->FVisible( pList[i] ) )

+				continue;

+		}

+

+		// Make this the last check, since it makes a string.

+		// Don't swat server ragdolls!

+		if ( FClassnameIs( pList[ i ], "physics_prop_ragdoll" ) )

+			continue;

+			

+		if ( FClassnameIs( pList[ i ], "prop_ragdoll" ) )

+			continue;

+

+		// The object must also be closer to the zombie than it is to the enemy

+		pNearest = pList[ i ];

+		flNearestDist = flDist;

+	}

+

+	m_hPhysicsEnt = pNearest;

+

+	if( m_hPhysicsEnt == NULL )

+	{

+		return false;

+	}

+	else

+	{

+		return true;

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Returns this monster's place in the relationship table.

+//-----------------------------------------------------------------------------

+Class_T	CNPC_BaseZombie::Classify( void )

+{

+	if ( IsSlumped() )

+		return CLASS_NONE;

+

+	return( CLASS_ZOMBIE ); 

+}

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+Disposition_t CNPC_BaseZombie::IRelationType( CBaseEntity *pTarget )

+{

+	// Slumping should not affect Zombie's opinion of others

+	if ( IsSlumped() )

+	{

+		m_bIsSlumped = false;

+		Disposition_t result = BaseClass::IRelationType( pTarget );

+		m_bIsSlumped = true;

+		return result;

+	}

+

+	return BaseClass::IRelationType( pTarget );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Returns the maximum yaw speed based on the monster's current activity.

+//-----------------------------------------------------------------------------

+float CNPC_BaseZombie::MaxYawSpeed( void )

+{

+	if( m_fIsTorso )

+	{

+		return( 60 );

+	}

+	else if (IsMoving() && HasPoseParameter( GetSequence(), m_poseMove_Yaw ))

+	{

+		return( 15 );

+	}

+	else

+	{

+		switch( GetActivity() )

+		{

+		case ACT_TURN_LEFT:

+		case ACT_TURN_RIGHT:

+			return 100;

+			break;

+		case ACT_RUN:

+			return 15;

+			break;

+		case ACT_WALK:

+		case ACT_IDLE:

+			return 25;

+			break;

+		case ACT_RANGE_ATTACK1:

+		case ACT_RANGE_ATTACK2:

+		case ACT_MELEE_ATTACK1:

+		case ACT_MELEE_ATTACK2:

+			return 120;

+		default:

+			return 90;

+			break;

+		}

+	}

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: turn in the direction of movement

+// Output :

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::OverrideMoveFacing( const AILocalMoveGoal_t &move, float flInterval )

+{

+	if (!HasPoseParameter( GetSequence(), m_poseMove_Yaw ))

+	{

+		return BaseClass::OverrideMoveFacing( move, flInterval );

+	}

+

+	// required movement direction

+	float flMoveYaw = UTIL_VecToYaw( move.dir );

+	float idealYaw = UTIL_AngleMod( flMoveYaw );

+

+	if (GetEnemy())

+	{

+		float flEDist = UTIL_DistApprox2D( WorldSpaceCenter(), GetEnemy()->WorldSpaceCenter() );

+

+		if (flEDist < 256.0)

+		{

+			float flEYaw = UTIL_VecToYaw( GetEnemy()->WorldSpaceCenter() - WorldSpaceCenter() );

+

+			if (flEDist < 128.0)

+			{

+				idealYaw = flEYaw;

+			}

+			else

+			{

+				idealYaw = flMoveYaw + UTIL_AngleDiff( flEYaw, flMoveYaw ) * (2 - flEDist / 128.0);

+			}

+

+			//DevMsg("was %.0f now %.0f\n", flMoveYaw, idealYaw );

+		}

+	}

+

+	GetMotor()->SetIdealYawAndUpdate( idealYaw );

+

+	// find movement direction to compensate for not being turned far enough

+	float fSequenceMoveYaw = GetSequenceMoveYaw( GetSequence() );

+	float flDiff = UTIL_AngleDiff( flMoveYaw, GetLocalAngles().y + fSequenceMoveYaw );

+	SetPoseParameter( m_poseMove_Yaw, GetPoseParameter( m_poseMove_Yaw ) + flDiff );

+

+	return true;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: For innate melee attack

+// Input  :

+// Output :

+//-----------------------------------------------------------------------------

+int CNPC_BaseZombie::MeleeAttack1Conditions ( float flDot, float flDist )

+{

+	float range = GetClawAttackRange();

+

+	if (flDist > range )

+	{

+		// Translate a hit vehicle into its passenger if found

+		if ( GetEnemy() != NULL )

+		{

+#if defined(HL2_DLL) && !defined(HL2MP)

+			// If the player is holding an object, knock it down.

+			if( GetEnemy()->IsPlayer() )

+			{

+				CBasePlayer *pPlayer = ToBasePlayer( GetEnemy() );

+

+				Assert( pPlayer != NULL );

+

+				// Is the player carrying something?

+				CBaseEntity *pObject = GetPlayerHeldEntity(pPlayer);

+

+				if( !pObject )

+				{

+					pObject = PhysCannonGetHeldEntity( pPlayer->GetActiveWeapon() );

+				}

+

+				if( pObject )

+				{

+					float flDist = pObject->WorldSpaceCenter().DistTo( WorldSpaceCenter() );

+

+					if( flDist <= GetClawAttackRange() )

+						return COND_CAN_MELEE_ATTACK1;

+				}

+			}

+#endif

+		}

+		return COND_TOO_FAR_TO_ATTACK;

+	}

+

+	if (flDot < 0.7)

+	{

+		return COND_NOT_FACING_ATTACK;

+	}

+

+	// Build a cube-shaped hull, the same hull that ClawAttack() is going to use.

+	Vector vecMins = GetHullMins();

+	Vector vecMaxs = GetHullMaxs();

+	vecMins.z = vecMins.x;

+	vecMaxs.z = vecMaxs.x;

+

+	Vector forward;

+	GetVectors( &forward, NULL, NULL );

+

+	trace_t	tr;

+	CTraceFilterNav traceFilter( this, false, this, COLLISION_GROUP_NONE );

+	AI_TraceHull( WorldSpaceCenter(), WorldSpaceCenter() + forward * GetClawAttackRange(), vecMins, vecMaxs, MASK_NPCSOLID, &traceFilter, &tr );

+

+	if( tr.fraction == 1.0 || !tr.m_pEnt )

+	{

+

+#ifdef HL2_EPISODIC

+

+		// If our trace was unobstructed but we were shooting 

+		if ( GetEnemy() && GetEnemy()->Classify() == CLASS_BULLSEYE )

+			return COND_CAN_MELEE_ATTACK1;

+

+#endif // HL2_EPISODIC

+

+		// This attack would miss completely. Trick the zombie into moving around some more.

+		return COND_TOO_FAR_TO_ATTACK;

+	}

+

+	if( tr.m_pEnt == GetEnemy() || 

+		tr.m_pEnt->IsNPC() || 

+		( tr.m_pEnt->m_takedamage == DAMAGE_YES && (dynamic_cast<CBreakableProp*>(tr.m_pEnt) ) ) )

+	{

+		// -Let the zombie swipe at his enemy if he's going to hit them.

+		// -Also let him swipe at NPC's that happen to be between the zombie and the enemy. 

+		//  This makes mobs of zombies seem more rowdy since it doesn't leave guys in the back row standing around.

+		// -Also let him swipe at things that takedamage, under the assumptions that they can be broken.

+		return COND_CAN_MELEE_ATTACK1;

+	}

+

+	Vector vecTrace = tr.endpos - tr.startpos;

+	float lenTraceSq = vecTrace.Length2DSqr();

+

+	if ( GetEnemy() && GetEnemy()->MyCombatCharacterPointer() && tr.m_pEnt == static_cast<CBaseCombatCharacter *>(GetEnemy())->GetVehicleEntity() )

+	{

+		if ( lenTraceSq < Square( GetClawAttackRange() * 0.75f ) )

+		{

+			return COND_CAN_MELEE_ATTACK1;

+		}

+	}

+

+	if( tr.m_pEnt->IsBSPModel() )

+	{

+		// The trace hit something solid, but it's not the enemy. If this item is closer to the zombie than

+		// the enemy is, treat this as an obstruction.

+		Vector vecToEnemy = GetEnemy()->WorldSpaceCenter() - WorldSpaceCenter();

+

+		if( lenTraceSq < vecToEnemy.Length2DSqr() )

+		{

+			return COND_ZOMBIE_LOCAL_MELEE_OBSTRUCTION;

+		}

+	}

+

+#ifdef HL2_EPISODIC

+

+	if ( !tr.m_pEnt->IsWorld() && GetEnemy() && GetEnemy()->GetGroundEntity() == tr.m_pEnt )

+	{

+		//Try to swat whatever the player is standing on instead of acting like a dill.

+		return COND_CAN_MELEE_ATTACK1;

+	}

+

+	// Bullseyes are given some grace on if they can be hit

+	if ( GetEnemy() && GetEnemy()->Classify() == CLASS_BULLSEYE )

+		return COND_CAN_MELEE_ATTACK1;

+

+#endif // HL2_EPISODIC

+

+	// Move around some more

+	return COND_TOO_FAR_TO_ATTACK;

+}

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+#define ZOMBIE_BUCKSHOT_TRIPLE_DAMAGE_DIST	96.0f // Triple damage from buckshot at 8 feet (headshot only)

+float CNPC_BaseZombie::GetHitgroupDamageMultiplier( int iHitGroup, const CTakeDamageInfo &info )

+{

+	switch( iHitGroup )

+	{

+	case HITGROUP_HEAD:

+		{

+			if( info.GetDamageType() & DMG_BUCKSHOT )

+			{

+				float flDist = FLT_MAX;

+

+				if( info.GetAttacker() )

+				{

+					flDist = ( GetAbsOrigin() - info.GetAttacker()->GetAbsOrigin() ).Length();

+				}

+

+				if( flDist <= ZOMBIE_BUCKSHOT_TRIPLE_DAMAGE_DIST )

+				{

+					return 3.0f;

+				}

+			}

+			else

+			{

+				return 2.0f;

+			}

+		}

+	}

+

+	return BaseClass::GetHitgroupDamageMultiplier( iHitGroup, info );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::TraceAttack( const CTakeDamageInfo &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator )

+{

+	CTakeDamageInfo infoCopy = info;

+

+	// Keep track of headshots so we can determine whether to pop off our headcrab.

+	if (ptr->hitgroup == HITGROUP_HEAD)

+	{

+		m_bHeadShot = true;

+	}

+

+	if( infoCopy.GetDamageType() & DMG_BUCKSHOT )

+	{

+		// Zombie gets across-the-board damage reduction for buckshot. This compensates for the recent changes which

+		// make the shotgun much more powerful, and returns the zombies to a level that has been playtested extensively.(sjb)

+		// This normalizes the buckshot damage to what it used to be on normal (5 dmg per pellet. Now it's 8 dmg per pellet). 

+		infoCopy.ScaleDamage( 0.625 );

+	}

+

+	BaseClass::TraceAttack( infoCopy, vecDir, ptr, pAccumulator );

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: A zombie has taken damage. Determine whether he should split in half

+// Input  : 

+// Output : bool, true if yes.

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::ShouldBecomeTorso( const CTakeDamageInfo &info, float flDamageThreshold )

+{

+	if ( info.GetDamageType() & DMG_REMOVENORAGDOLL )

+		return false;

+

+	if ( m_fIsTorso )

+	{

+		// Already split.

+		return false;

+	}

+

+	// Not if we're in a dss

+	if ( IsRunningDynamicInteraction() )

+		return false;

+

+	// Break in half IF:

+	// 

+	// Take half or more of max health in DMG_BLAST

+	if( (info.GetDamageType() & DMG_BLAST) && flDamageThreshold >= 0.5 )

+	{

+		return true;

+	}

+

+	if ( hl2_episodic.GetBool() )

+	{

+		// Always split after a cannon hit

+		if ( info.GetAmmoType() == GetAmmoDef()->Index("CombineHeavyCannon") )

+			return true;

+	}

+

+#if 0

+	if( info.GetDamageType() & DMG_BUCKSHOT )

+	{

+		if( m_iHealth <= 0 || flDamageThreshold >= 0.5 )

+		{

+			return true;

+		}

+	}

+#endif 

+	

+	return false;

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: A zombie has taken damage. Determine whether he release his headcrab.

+// Output : YES, IMMEDIATE, or SCHEDULED (see HeadcrabRelease_t)

+//-----------------------------------------------------------------------------

+HeadcrabRelease_t CNPC_BaseZombie::ShouldReleaseHeadcrab( const CTakeDamageInfo &info, float flDamageThreshold )

+{

+	if ( m_iHealth <= 0 )

+	{

+		if ( info.GetDamageType() & DMG_REMOVENORAGDOLL )

+			return RELEASE_NO;

+

+		if ( info.GetDamageType() & DMG_SNIPER )

+			return RELEASE_RAGDOLL;

+

+		// If I was killed by a bullet...

+		if ( info.GetDamageType() & DMG_BULLET )

+		{

+			if( m_bHeadShot ) 

+			{

+				if( flDamageThreshold > 0.25 )

+				{

+					// Enough force to kill the crab.

+					return RELEASE_RAGDOLL;

+				}

+			}

+			else

+			{

+				// Killed by a shot to body or something. Crab is ok!

+				return RELEASE_IMMEDIATE;

+			}

+		}

+

+		// If I was killed by an explosion, release the crab.

+		if ( info.GetDamageType() & DMG_BLAST )

+		{

+			return RELEASE_RAGDOLL;

+		}

+

+		if ( m_fIsTorso && IsChopped( info ) )

+		{

+			return RELEASE_RAGDOLL_SLICED_OFF;

+		}

+	}

+

+	return RELEASE_NO;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+// Input  : pInflictor - 

+//			pAttacker - 

+//			flDamage - 

+//			bitsDamageType - 

+// Output : int

+//-----------------------------------------------------------------------------

+#define ZOMBIE_SCORCH_RATE		8

+#define ZOMBIE_MIN_RENDERCOLOR	50

+int CNPC_BaseZombie::OnTakeDamage_Alive( const CTakeDamageInfo &inputInfo )

+{

+	CTakeDamageInfo info = inputInfo;

+

+	if( inputInfo.GetDamageType() & DMG_BURN )

+	{

+		// If a zombie is on fire it only takes damage from the fire that's attached to it. (DMG_DIRECT)

+		// This is to stop zombies from burning to death 10x faster when they're standing around

+		// 10 fire entities.

+		if( IsOnFire() && !(inputInfo.GetDamageType() & DMG_DIRECT) )

+		{

+			return 0;

+		}

+		

+		Scorch( ZOMBIE_SCORCH_RATE, ZOMBIE_MIN_RENDERCOLOR );

+	}

+

+	// Take some percentage of damage from bullets (unless hit in the crab). Always take full buckshot & sniper damage

+	if ( !m_bHeadShot && (info.GetDamageType() & DMG_BULLET) && !(info.GetDamageType() & (DMG_BUCKSHOT|DMG_SNIPER)) )

+	{

+		info.ScaleDamage( ZOMBIE_BULLET_DAMAGE_SCALE );

+	}

+

+	if ( ShouldIgnite( info ) )

+	{

+		Ignite( 100.0f );

+	}

+

+	int tookDamage = BaseClass::OnTakeDamage_Alive( info );

+

+	// flDamageThreshold is what percentage of the creature's max health

+	// this amount of damage represents. (clips at 1.0)

+	float flDamageThreshold = MIN( 1, info.GetDamage() / m_iMaxHealth );

+	

+	// Being chopped up by a sharp physics object is a pretty special case

+	// so we handle it with some special code. Mainly for 

+	// Ravenholm's helicopter traps right now (sjb).

+	bool bChopped = IsChopped(info);

+	bool bSquashed = IsSquashed(info);

+	bool bKilledByVehicle = ( ( info.GetDamageType() & DMG_VEHICLE ) != 0 );

+

+	if( !m_fIsTorso && (bChopped || bSquashed) && !bKilledByVehicle && !(info.GetDamageType() & DMG_REMOVENORAGDOLL) )

+	{

+		if( bChopped )

+		{

+			EmitSound( "E3_Phystown.Slicer" );

+		}

+

+		DieChopped( info );

+	}

+	else

+	{

+		HeadcrabRelease_t release = ShouldReleaseHeadcrab( info, flDamageThreshold );

+		

+		switch( release )

+		{

+		case RELEASE_IMMEDIATE:

+			ReleaseHeadcrab( EyePosition(), vec3_origin, true, true );

+			break;

+

+		case RELEASE_RAGDOLL:

+			// Go a little easy on headcrab ragdoll force. They're light!

+			ReleaseHeadcrab( EyePosition(), inputInfo.GetDamageForce() * 0.25, true, false, true );

+			break;

+

+		case RELEASE_RAGDOLL_SLICED_OFF:

+			{

+				EmitSound( "E3_Phystown.Slicer" );

+				Vector vecForce = inputInfo.GetDamageForce() * 0.1;

+				vecForce += Vector( 0, 0, 2000.0 );

+				ReleaseHeadcrab( EyePosition(), vecForce, true, false, true );

+			}

+			break;

+

+		case RELEASE_VAPORIZE:

+			RemoveHead();

+			break;

+

+		case RELEASE_SCHEDULED:

+			SetCondition( COND_ZOMBIE_RELEASECRAB );

+			break;

+		}

+

+		if( ShouldBecomeTorso( info, flDamageThreshold ) )

+		{

+			bool bHitByCombineCannon = (inputInfo.GetAmmoType() == GetAmmoDef()->Index("CombineHeavyCannon"));

+

+			if ( CanBecomeLiveTorso() )

+			{

+				BecomeTorso( vec3_origin, inputInfo.GetDamageForce() * 0.50 );

+

+				if ( ( info.GetDamageType() & DMG_BLAST) && random->RandomInt( 0, 1 ) == 0 )

+				{

+					Ignite( 5.0 + random->RandomFloat( 0.0, 5.0 ) );

+				}

+

+				// For Combine cannon impacts

+				if ( hl2_episodic.GetBool() )

+				{

+					if ( bHitByCombineCannon )

+					{

+						// Catch on fire.

+						Ignite( 5.0f + random->RandomFloat( 0.0f, 5.0f ) );

+					}

+				}

+

+				if (flDamageThreshold >= 1.0)

+				{

+					m_iHealth = 0;

+					BecomeRagdollOnClient( info.GetDamageForce() );

+				}

+			}

+			else if ( random->RandomInt(1, 3) == 1 )

+				DieChopped( info );

+		}

+	}

+

+	if( tookDamage > 0 && (info.GetDamageType() & (DMG_BURN|DMG_DIRECT)) && m_ActBusyBehavior.IsActive() ) 

+	{

+		//!!!HACKHACK- Stuff a light_damage condition if an actbusying zombie takes direct burn damage. This will cause an

+		// ignited zombie to 'wake up' and rise out of its actbusy slump. (sjb)

+		SetCondition( COND_LIGHT_DAMAGE );

+	}

+

+	// IMPORTANT: always clear the headshot flag after applying damage. No early outs!

+	m_bHeadShot = false;

+

+	return tookDamage;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: make a sound Alyx can hear when in darkness mode

+// Input  : volume (radius) of the sound.

+// Output :

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::MakeAISpookySound( float volume, float duration )

+{

+#ifdef HL2_EPISODIC

+	if ( HL2GameRules()->IsAlyxInDarknessMode() )

+	{

+		CSoundEnt::InsertSound( SOUND_COMBAT, EyePosition(), volume, duration, this, SOUNDENT_CHANNEL_SPOOKY_NOISE );

+	}

+#endif // HL2_EPISODIC

+}

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::CanPlayMoanSound()

+{

+	if( HasSpawnFlags( SF_NPC_GAG ) )

+		return false;

+

+	// Burning zombies play their moan loop at full volume for as long as they're

+	// burning. Don't let a moan envelope play cause it will turn the volume down when done.

+	if( IsOnFire() )

+		return false;

+

+	// Members of a small group of zombies can vocalize whenever they want

+	if( s_iAngryZombies <= 4 )

+		return true;

+

+	// This serves to limit the number of zombies that can moan at one time when there are a lot. 

+	if( random->RandomInt( 1, zombie_moanfreq.GetInt() * (s_iAngryZombies/2) ) == 1 )

+	{

+		return true;

+	}

+

+	return false;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Open a window and let a little bit of the looping moan sound

+//			come through.

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::MoanSound( envelopePoint_t *pEnvelope, int iEnvelopeSize )

+{

+	if( HasSpawnFlags( SF_NPC_GAG ) )

+	{

+		// Not yet!

+		return;

+	}

+

+	if( !m_pMoanSound )

+	{

+		// Don't set this up until the code calls for it.

+		const char *pszSound = GetMoanSound( m_iMoanSound );

+		m_flMoanPitch = random->RandomInt( zombie_basemin.GetInt(), zombie_basemax.GetInt() );

+

+		//m_pMoanSound = ENVELOPE_CONTROLLER.SoundCreate( entindex(), CHAN_STATIC, pszSound, ATTN_NORM );

+		CPASAttenuationFilter filter( this );

+		m_pMoanSound = ENVELOPE_CONTROLLER.SoundCreate( filter, entindex(), CHAN_STATIC, pszSound, ATTN_NORM );

+

+		ENVELOPE_CONTROLLER.Play( m_pMoanSound, 1.0, m_flMoanPitch );

+	}

+

+	//HACKHACK get these from chia chin's console vars.

+	envDefaultZombieMoanVolumeFast[ 1 ].durationMin = zombie_decaymin.GetFloat();

+	envDefaultZombieMoanVolumeFast[ 1 ].durationMax = zombie_decaymax.GetFloat();

+

+	if( random->RandomInt( 1, 2 ) == 1 )

+	{

+		IdleSound();

+	}

+

+	float duration = ENVELOPE_CONTROLLER.SoundPlayEnvelope( m_pMoanSound, SOUNDCTRL_CHANGE_VOLUME, pEnvelope, iEnvelopeSize );

+

+	float flPitch = random->RandomInt( m_flMoanPitch + zombie_changemin.GetInt(), m_flMoanPitch + zombie_changemax.GetInt() );

+	ENVELOPE_CONTROLLER.SoundChangePitch( m_pMoanSound, flPitch, 0.3 );

+

+	m_flNextMoanSound = gpGlobals->curtime + duration + 9999;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Determine whether the zombie is chopped up by some physics item

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::IsChopped( const CTakeDamageInfo &info )

+{

+	float flDamageThreshold = MIN( 1, info.GetDamage() / m_iMaxHealth );

+

+	if ( m_iHealth > 0 || flDamageThreshold <= 0.5 )

+		return false;

+

+	if ( !( info.GetDamageType() & DMG_SLASH) )

+		return false;

+

+	if ( !( info.GetDamageType() & DMG_CRUSH) )

+		return false;

+

+	if ( info.GetDamageType() & DMG_REMOVENORAGDOLL )

+		return false;

+

+	// If you take crush and slash damage, you're hit by a sharp physics item.

+	return true;

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Return true if this gibbing zombie should ignite its gibs

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::ShouldIgniteZombieGib( void )

+{

+#ifdef HL2_EPISODIC

+	// If we're in darkness mode, don't ignite giblets, because we don't want to

+	// pay the perf cost of multiple dynamic lights per giblet.

+	return ( IsOnFire() && !HL2GameRules()->IsAlyxInDarknessMode() );

+#else

+	return IsOnFire();

+#endif 

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Handle the special case of a zombie killed by a physics chopper.

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::DieChopped( const CTakeDamageInfo &info )

+{

+	bool bSquashed = IsSquashed(info);

+

+	Vector forceVector( vec3_origin );

+

+	forceVector += CalcDamageForceVector( info );

+

+	if( !m_fIsHeadless && !bSquashed )

+	{

+		if( random->RandomInt( 0, 1 ) == 0 )

+		{

+			// Drop a live crab half of the time.

+			ReleaseHeadcrab( EyePosition(), forceVector * 0.005, true, false, false );

+		}

+	}

+

+	float flFadeTime = 0.0;

+

+	if( HasSpawnFlags( SF_NPC_FADE_CORPSE ) )

+	{

+		flFadeTime = 5.0;

+	}

+

+	SetSolid( SOLID_NONE );

+	AddEffects( EF_NODRAW );

+

+	Vector vecLegsForce;

+	vecLegsForce.x = random->RandomFloat( -400, 400 );

+	vecLegsForce.y = random->RandomFloat( -400, 400 );

+	vecLegsForce.z = random->RandomFloat( 0, 250 );

+

+	if( bSquashed && vecLegsForce.z > 0 )

+	{

+		// Force the broken legs down. (Give some additional force, too)

+		vecLegsForce.z *= -10;

+	}

+

+	CBaseEntity *pLegGib = CreateRagGib( GetLegsModel(), GetAbsOrigin(), GetAbsAngles(), vecLegsForce, flFadeTime, ShouldIgniteZombieGib() );

+	if ( pLegGib )

+	{

+		CopyRenderColorTo( pLegGib );

+	}

+

+	forceVector *= random->RandomFloat( 0.04, 0.06 );

+	forceVector.z = ( 100 * 12 * 5 ) * random->RandomFloat( 0.8, 1.2 );

+

+	if( bSquashed && forceVector.z > 0 )

+	{

+		// Force the broken torso down.

+		forceVector.z *= -1.0;

+	}

+

+	// Why do I have to fix this up?! (sjb)

+	QAngle TorsoAngles;

+	TorsoAngles = GetAbsAngles();

+	TorsoAngles.x -= 90.0f;

+	CBaseEntity *pTorsoGib = CreateRagGib( GetTorsoModel(), GetAbsOrigin() + Vector( 0, 0, 64 ), TorsoAngles, forceVector, flFadeTime, ShouldIgniteZombieGib() );

+	if ( pTorsoGib )

+	{

+		CBaseAnimating *pAnimating = dynamic_cast<CBaseAnimating*>(pTorsoGib);

+		if( pAnimating )

+		{

+			pAnimating->SetBodygroup( ZOMBIE_BODYGROUP_HEADCRAB, !m_fIsHeadless );

+		}

+

+		pTorsoGib->SetOwnerEntity( this );

+		CopyRenderColorTo( pTorsoGib );

+

+	}

+

+	if ( UTIL_ShouldShowBlood( BLOOD_COLOR_YELLOW ) )

+	{

+		int i;

+		Vector vecSpot;

+		Vector vecDir;

+

+		for ( i = 0 ; i < 4; i++ )

+		{

+			vecSpot = WorldSpaceCenter();

+

+			vecSpot.x += random->RandomFloat( -12, 12 ); 

+			vecSpot.y += random->RandomFloat( -12, 12 ); 

+			vecSpot.z += random->RandomFloat( -4, 16 ); 

+

+			UTIL_BloodDrips( vecSpot, vec3_origin, BLOOD_COLOR_YELLOW, 50 );

+		}

+

+		for ( int i = 0 ; i < 4 ; i++ )

+		{

+			Vector vecSpot = WorldSpaceCenter();

+

+			vecSpot.x += random->RandomFloat( -12, 12 ); 

+			vecSpot.y += random->RandomFloat( -12, 12 ); 

+			vecSpot.z += random->RandomFloat( -4, 16 );

+

+			vecDir.x = random->RandomFloat(-1, 1);

+			vecDir.y = random->RandomFloat(-1, 1);

+			vecDir.z = 0;

+			VectorNormalize( vecDir );

+

+			UTIL_BloodImpact( vecSpot, vecDir, BloodColor(), 1 );

+		}

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: damage has been done. Should the zombie ignite?

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::ShouldIgnite( const CTakeDamageInfo &info )

+{

+ 	if ( IsOnFire() )

+	{

+		// Already burning!

+		return false;

+	}

+

+	if ( info.GetDamageType() & DMG_BURN )

+	{

+		//

+		// If we take more than ten percent of our health in burn damage within a five

+		// second interval, we should catch on fire.

+		//

+		m_flBurnDamage += info.GetDamage();

+		m_flBurnDamageResetTime = gpGlobals->curtime + 5;

+

+		if ( m_flBurnDamage >= m_iMaxHealth * 0.1 )

+		{

+			return true;

+		}

+	}

+

+	return false;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Sufficient fire damage has been done. Zombie ignites!

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::Ignite( float flFlameLifetime, bool bNPCOnly, float flSize, bool bCalledByLevelDesigner )

+{

+	BaseClass::Ignite( flFlameLifetime, bNPCOnly, flSize, bCalledByLevelDesigner );

+

+#ifdef HL2_EPISODIC

+	if ( HL2GameRules()->IsAlyxInDarknessMode() == true && GetEffectEntity() != NULL )

+	{

+		GetEffectEntity()->AddEffects( EF_DIMLIGHT );

+	}

+#endif // HL2_EPISODIC

+

+	// Set the zombie up to burn to death in about ten seconds.

+	SetHealth( MIN( m_iHealth, FLAME_DIRECT_DAMAGE_PER_SEC * (ZOMBIE_BURN_TIME + random->RandomFloat( -ZOMBIE_BURN_TIME_NOISE, ZOMBIE_BURN_TIME_NOISE)) ) );

+

+	// FIXME: use overlays when they come online

+	//AddOverlay( ACT_ZOM_WALK_ON_FIRE, false );

+	if( !m_ActBusyBehavior.IsActive() )

+	{

+		Activity activity = GetActivity();

+		Activity burningActivity = activity;

+

+		if ( activity == ACT_WALK )

+		{

+			burningActivity = ACT_WALK_ON_FIRE;

+		}

+		else if ( activity == ACT_RUN )

+		{

+			burningActivity = ACT_RUN_ON_FIRE;

+		}

+		else if ( activity == ACT_IDLE )

+		{

+			burningActivity = ACT_IDLE_ON_FIRE;

+		}

+

+		if( HaveSequenceForActivity(burningActivity) )

+		{

+			// Make sure we have a sequence for this activity (torsos don't have any, for instance) 

+			// to prevent the baseNPC & baseAnimating code from throwing red level errors.

+			SetActivity( burningActivity );

+		}

+	}

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::CopyRenderColorTo( CBaseEntity *pOther )

+{

+	color32 color = GetRenderColor();

+	pOther->SetRenderColor( color.r, color.g, color.b, color.a );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Look in front and see if the claw hit anything.

+//

+// Input  :	flDist				distance to trace		

+//			iDamage				damage to do if attack hits

+//			vecViewPunch		camera punch (if attack hits player)

+//			vecVelocityPunch	velocity punch (if attack hits player)

+//

+// Output : The entity hit by claws. NULL if nothing.

+//-----------------------------------------------------------------------------

+CBaseEntity *CNPC_BaseZombie::ClawAttack( float flDist, int iDamage, QAngle &qaViewPunch, Vector &vecVelocityPunch, int BloodOrigin  )

+{

+	// Added test because claw attack anim sometimes used when for cases other than melee

+	int iDriverInitialHealth = -1;

+	CBaseEntity *pDriver = NULL;

+	if ( GetEnemy() )

+	{

+		trace_t	tr;

+		AI_TraceHull( WorldSpaceCenter(), GetEnemy()->WorldSpaceCenter(), -Vector(8,8,8), Vector(8,8,8), MASK_SOLID_BRUSHONLY, this, COLLISION_GROUP_NONE, &tr );

+

+		if ( tr.fraction < 1.0f )

+			return NULL;

+

+		// CheckTraceHullAttack() can damage player in vehicle as side effect of melee attack damaging physics objects, which the car forwards to the player

+		// need to detect this to get correct damage effects

+		CBaseCombatCharacter *pCCEnemy = ( GetEnemy() != NULL ) ? GetEnemy()->MyCombatCharacterPointer() : NULL;

+		CBaseEntity *pVehicleEntity;

+		if ( pCCEnemy != NULL && ( pVehicleEntity = pCCEnemy->GetVehicleEntity() ) != NULL )

+		{

+			if ( pVehicleEntity->GetServerVehicle() && dynamic_cast<CPropVehicleDriveable *>(pVehicleEntity) )

+			{

+				pDriver = static_cast<CPropVehicleDriveable *>(pVehicleEntity)->GetDriver();

+				if ( pDriver && pDriver->IsPlayer() )

+				{

+					iDriverInitialHealth = pDriver->GetHealth();

+				}

+				else

+				{

+					pDriver = NULL;

+				}

+			}

+		}

+	}

+

+	//

+	// Trace out a cubic section of our hull and see what we hit.

+	//

+	Vector vecMins = GetHullMins();

+	Vector vecMaxs = GetHullMaxs();

+	vecMins.z = vecMins.x;

+	vecMaxs.z = vecMaxs.x;

+

+	CBaseEntity *pHurt = NULL;

+	if ( GetEnemy() && GetEnemy()->Classify() == CLASS_BULLSEYE )

+	{ 

+		// We always hit bullseyes we're targeting

+		pHurt = GetEnemy();

+		CTakeDamageInfo info( this, this, vec3_origin, GetAbsOrigin(), iDamage, DMG_SLASH );

+		pHurt->TakeDamage( info );

+	}

+	else 

+	{

+		// Try to hit them with a trace

+		pHurt = CheckTraceHullAttack( flDist, vecMins, vecMaxs, iDamage, DMG_SLASH );

+	}

+

+	if ( pDriver && iDriverInitialHealth != pDriver->GetHealth() )

+	{

+		pHurt = pDriver;

+	}

+

+	if ( !pHurt && m_hPhysicsEnt != NULL && IsCurSchedule(SCHED_ZOMBIE_ATTACKITEM) )

+	{

+		pHurt = m_hPhysicsEnt;

+

+		Vector vForce = pHurt->WorldSpaceCenter() - WorldSpaceCenter(); 

+		VectorNormalize( vForce );

+

+		vForce *= 5 * 24;

+

+		CTakeDamageInfo info( this, this, vForce, GetAbsOrigin(), iDamage, DMG_SLASH );

+		pHurt->TakeDamage( info );

+

+		pHurt = m_hPhysicsEnt;

+	}

+

+	if ( pHurt )

+	{

+		AttackHitSound();

+

+		CBasePlayer *pPlayer = ToBasePlayer( pHurt );

+

+		if ( pPlayer != NULL && !(pPlayer->GetFlags() & FL_GODMODE ) )

+		{

+			pPlayer->ViewPunch( qaViewPunch );

+			

+			pPlayer->VelocityPunch( vecVelocityPunch );

+		}

+		else if( !pPlayer && UTIL_ShouldShowBlood(pHurt->BloodColor()) )

+		{

+			// Hit an NPC. Bleed them!

+			Vector vecBloodPos;

+

+			switch( BloodOrigin )

+			{

+			case ZOMBIE_BLOOD_LEFT_HAND:

+				if( GetAttachment( "blood_left", vecBloodPos ) )

+					SpawnBlood( vecBloodPos, g_vecAttackDir, pHurt->BloodColor(), MIN( iDamage, 30 ) );

+				break;

+

+			case ZOMBIE_BLOOD_RIGHT_HAND:

+				if( GetAttachment( "blood_right", vecBloodPos ) )

+					SpawnBlood( vecBloodPos, g_vecAttackDir, pHurt->BloodColor(), MIN( iDamage, 30 ) );

+				break;

+

+			case ZOMBIE_BLOOD_BOTH_HANDS:

+				if( GetAttachment( "blood_left", vecBloodPos ) )

+					SpawnBlood( vecBloodPos, g_vecAttackDir, pHurt->BloodColor(), MIN( iDamage, 30 ) );

+

+				if( GetAttachment( "blood_right", vecBloodPos ) )

+					SpawnBlood( vecBloodPos, g_vecAttackDir, pHurt->BloodColor(), MIN( iDamage, 30 ) );

+				break;

+

+			case ZOMBIE_BLOOD_BITE:

+				// No blood for these.

+				break;

+			}

+		}

+	}

+	else 

+	{

+		AttackMissSound();

+	}

+

+	if ( pHurt == m_hPhysicsEnt && IsCurSchedule(SCHED_ZOMBIE_ATTACKITEM) )

+	{

+		m_hPhysicsEnt = NULL;

+		m_flNextSwat = gpGlobals->curtime + random->RandomFloat( 2, 4 );

+	}

+

+	return pHurt;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: The zombie is frustrated and pounding walls/doors. Make an appropriate noise

+// Input  : 

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::PoundSound()

+{

+	trace_t		tr;

+	Vector		forward;

+

+	GetVectors( &forward, NULL, NULL );

+

+	AI_TraceLine( EyePosition(), EyePosition() + forward * 128, MASK_SOLID, this, COLLISION_GROUP_NONE, &tr );

+

+	if( tr.fraction == 1.0 )

+	{

+		// Didn't hit anything!

+		return;

+	}

+

+	if( tr.fraction < 1.0 && tr.m_pEnt )

+	{

+		const surfacedata_t *psurf = physprops->GetSurfaceData( tr.surface.surfaceProps );

+		if( psurf )

+		{

+			EmitSound( physprops->GetString(psurf->sounds.impactHard) );

+			return;

+		}

+	}

+

+	// Otherwise fall through to the default sound.

+	CPASAttenuationFilter filter( this,"NPC_BaseZombie.PoundDoor" );

+	EmitSound( filter, entindex(),"NPC_BaseZombie.PoundDoor" );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Catches the monster-specific events that occur when tagged animation

+//			frames are played.

+// Input  : pEvent - 

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::HandleAnimEvent( animevent_t *pEvent )

+{

+	if ( pEvent->event == AE_NPC_ATTACK_BROADCAST )

+	{

+		if( GetEnemy() && GetEnemy()->IsNPC() )

+		{

+			if( HasCondition(COND_CAN_MELEE_ATTACK1) )

+			{

+				// This animation is sometimes played by code that doesn't intend to attack the enemy

+				// (For instance, code that makes a zombie take a frustrated swipe at an obstacle). 

+				// Try not to trigger a reaction from our enemy unless we're really attacking. 

+				GetEnemy()->MyNPCPointer()->DispatchInteraction( g_interactionZombieMeleeWarning, NULL, this );

+			}

+		}

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_POUND )

+	{

+		PoundSound();

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_ALERTSOUND )

+	{

+		AlertSound();

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_STEP_LEFT )

+	{

+		MakeAIFootstepSound( 180.0f );

+		FootstepSound( false );

+		return;

+	}

+	

+	if ( pEvent->event == AE_ZOMBIE_STEP_RIGHT )

+	{

+		MakeAIFootstepSound( 180.0f );

+		FootstepSound( true );

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_GET_UP )

+	{

+		MakeAIFootstepSound( 180.0f, 3.0f );

+		if( !IsOnFire() )

+		{

+			// If you let this code run while a zombie is burning, it will stop wailing. 

+			m_flNextMoanSound = gpGlobals->curtime;

+			MoanSound( envDefaultZombieMoanVolumeFast, ARRAYSIZE( envDefaultZombieMoanVolumeFast ) );

+		}

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_SCUFF_LEFT )

+	{

+		MakeAIFootstepSound( 180.0f );

+		FootscuffSound( false );

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_SCUFF_RIGHT )

+	{

+		MakeAIFootstepSound( 180.0f );

+		FootscuffSound( true );

+		return;

+	}

+

+	// all swat animations are handled as a single case.

+	if ( pEvent->event == AE_ZOMBIE_STARTSWAT )

+	{

+		MakeAIFootstepSound( 180.0f );

+		AttackSound();

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_ATTACK_SCREAM )

+	{

+		AttackSound();

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_SWATITEM )

+	{

+		CBaseEntity *pEnemy = GetEnemy();

+		if ( pEnemy )

+		{

+			Vector v;

+			CBaseEntity *pPhysicsEntity = m_hPhysicsEnt;

+			if( !pPhysicsEntity )

+			{

+				DevMsg( "**Zombie: Missing my physics ent!!" );

+				return;

+			}

+			

+			IPhysicsObject *pPhysObj = pPhysicsEntity->VPhysicsGetObject();

+

+			if( !pPhysObj )

+			{

+				DevMsg( "**Zombie: No Physics Object for physics Ent!" );

+				return;

+			}

+

+			EmitSound( "NPC_BaseZombie.Swat" );

+			PhysicsImpactSound( pEnemy, pPhysObj, CHAN_BODY, pPhysObj->GetMaterialIndex(), physprops->GetSurfaceIndex("flesh"), 0.5, 800 );

+

+			Vector physicsCenter = pPhysicsEntity->WorldSpaceCenter();

+			v = pEnemy->WorldSpaceCenter() - physicsCenter;

+			VectorNormalize(v);

+

+			// Send the object at 800 in/sec toward the enemy.  Add 200 in/sec up velocity to keep it

+			// in the air for a second or so.

+			v = v * 800;

+			v.z += 200;

+

+			// add some spin so the object doesn't appear to just fly in a straight line

+			// Also this spin will move the object slightly as it will press on whatever the object

+			// is resting on.

+			AngularImpulse angVelocity( random->RandomFloat(-180, 180), 20, random->RandomFloat(-360, 360) );

+

+			pPhysObj->AddVelocity( &v, &angVelocity );

+

+			// If we don't put the object scan time well into the future, the zombie

+			// will re-select the object he just hit as it is flying away from him.

+			// It will likely always be the nearest object because the zombie moved

+			// close enough to it to hit it.

+			m_hPhysicsEnt = NULL;

+

+			m_flNextSwatScan = gpGlobals->curtime + ZOMBIE_SWAT_DELAY;

+

+			return;

+		}

+	}

+	

+	if ( pEvent->event == AE_ZOMBIE_ATTACK_RIGHT )

+	{

+		Vector right, forward;

+		AngleVectors( GetLocalAngles(), &forward, &right, NULL );

+		

+		right = right * 100;

+		forward = forward * 200;

+

+		QAngle qa( -15, -20, -10 );

+		Vector vec = right + forward;

+		ClawAttack( GetClawAttackRange(), sk_zombie_dmg_one_slash.GetFloat(), qa, vec, ZOMBIE_BLOOD_RIGHT_HAND );

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_ATTACK_LEFT )

+	{

+		Vector right, forward;

+		AngleVectors( GetLocalAngles(), &forward, &right, NULL );

+

+		right = right * -100;

+		forward = forward * 200;

+

+		QAngle qa( -15, 20, -10 );

+		Vector vec = right + forward;

+		ClawAttack( GetClawAttackRange(), sk_zombie_dmg_one_slash.GetFloat(), qa, vec, ZOMBIE_BLOOD_LEFT_HAND );

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_ATTACK_BOTH )

+	{

+		Vector forward;

+		QAngle qaPunch( 45, random->RandomInt(-5,5), random->RandomInt(-5,5) );

+		AngleVectors( GetLocalAngles(), &forward );

+		forward = forward * 200;

+		ClawAttack( GetClawAttackRange(), sk_zombie_dmg_one_slash.GetFloat(), qaPunch, forward, ZOMBIE_BLOOD_BOTH_HANDS );

+		return;

+	}

+

+	if ( pEvent->event == AE_ZOMBIE_POPHEADCRAB )

+	{

+		if ( GetInteractionPartner() == NULL )

+			return;

+

+		const char	*pString = pEvent->options;

+		char		token[128];

+		pString = nexttoken( token, pString, ' ' );

+

+		int boneIndex = GetInteractionPartner()->LookupBone( token );

+

+		if ( boneIndex == -1 )

+		{

+			Warning( "AE_ZOMBIE_POPHEADCRAB event using invalid bone name! Usage: event AE_ZOMBIE_POPHEADCRAB \"<BoneName> <Speed>\" \n" );

+			return;

+		}

+

+		pString = nexttoken( token, pString, ' ' );

+

+		if ( !token )

+		{

+			Warning( "AE_ZOMBIE_POPHEADCRAB event format missing velocity parameter! Usage: event AE_ZOMBIE_POPHEADCRAB \"<BoneName> <Speed>\" \n" );

+			return;

+		}

+

+		Vector vecBonePosition;

+		QAngle angles;

+		Vector vecHeadCrabPosition;

+

+		int iCrabAttachment = LookupAttachment( "headcrab" );

+		int iSpeed = atoi( token );

+

+		GetInteractionPartner()->GetBonePosition( boneIndex, vecBonePosition, angles );

+		GetAttachment( iCrabAttachment, vecHeadCrabPosition );

+

+		Vector vVelocity = vecHeadCrabPosition - vecBonePosition;

+		VectorNormalize( vVelocity );

+

+		CTakeDamageInfo	dmgInfo( this, GetInteractionPartner(), m_iHealth, DMG_DIRECT );

+

+		dmgInfo.SetDamagePosition( vecHeadCrabPosition );

+

+		ReleaseHeadcrab( EyePosition(), vVelocity * iSpeed, true, false, true );

+

+		GuessDamageForce( &dmgInfo, vVelocity, vecHeadCrabPosition, 0.5f );

+		TakeDamage( dmgInfo );

+		return;

+	}

+

+	BaseClass::HandleAnimEvent( pEvent );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Spawn function for the base zombie.

+//

+// !!!IMPORTANT!!! YOUR DERIVED CLASS'S SPAWN() RESPONSIBILITIES:

+//

+//		Call Precache();

+//		Set status for m_fIsTorso & m_fIsHeadless

+//		Set blood color

+//		Set health

+//		Set field of view

+//		Call CapabilitiesClear() & then set relevant capabilities

+//		THEN Call BaseClass::Spawn()

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::Spawn( void )

+{

+	SetSolid( SOLID_BBOX );

+	SetMoveType( MOVETYPE_STEP );

+

+#ifdef _XBOX

+	// Always fade the corpse

+	AddSpawnFlags( SF_NPC_FADE_CORPSE );

+#endif // _XBOX

+

+	m_NPCState			= NPC_STATE_NONE;

+

+	CapabilitiesAdd( bits_CAP_MOVE_GROUND | bits_CAP_INNATE_MELEE_ATTACK1 );

+	CapabilitiesAdd( bits_CAP_SQUAD );

+

+	m_flNextSwat = gpGlobals->curtime;

+	m_flNextSwatScan = gpGlobals->curtime;

+	m_pMoanSound = NULL;

+

+	m_flNextMoanSound = gpGlobals->curtime + 9999;

+

+	SetZombieModel();

+

+	NPCInit();

+

+	m_bIsSlumped = false;

+

+	// Zombies get to cheat for 6 seconds (sjb)

+	GetEnemies()->SetFreeKnowledgeDuration( 6.0 );

+

+	m_ActBusyBehavior.SetUseRenderBounds(true);

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Pecaches all resources this NPC needs.

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::Precache( void )

+{

+	UTIL_PrecacheOther( GetHeadcrabClassname() );

+

+	PrecacheScriptSound( "E3_Phystown.Slicer" );

+	PrecacheScriptSound( "NPC_BaseZombie.PoundDoor" );

+	PrecacheScriptSound( "NPC_BaseZombie.Swat" );

+

+	PrecacheModel( GetLegsModel() );

+	PrecacheModel( GetTorsoModel() );

+

+	PrecacheParticleSystem( "blood_impact_zombie_01" );

+

+	BaseClass::Precache();

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::StartTouch( CBaseEntity *pOther )

+{

+	BaseClass::StartTouch( pOther );

+

+	if( IsSlumped() && hl2_episodic.GetBool() )

+	{

+		if( FClassnameIs( pOther, "prop_physics" ) )

+		{

+			// Get up!

+			m_ActBusyBehavior.StopBusying();

+		}

+	}

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+bool CNPC_BaseZombie::CreateBehaviors()

+{

+	AddBehavior( &m_ActBusyBehavior );

+

+	return BaseClass::CreateBehaviors();

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+int CNPC_BaseZombie::TranslateSchedule( int scheduleType )

+{

+	switch( scheduleType )

+	{

+	case SCHED_CHASE_ENEMY:

+		if ( HasCondition( COND_ZOMBIE_LOCAL_MELEE_OBSTRUCTION ) && !HasCondition(COND_TASK_FAILED) && IsCurSchedule( SCHED_ZOMBIE_CHASE_ENEMY, false ) )

+		{

+			return SCHED_COMBAT_PATROL;

+		}

+		return SCHED_ZOMBIE_CHASE_ENEMY;

+		break;

+

+	case SCHED_ZOMBIE_SWATITEM:

+		// If the object is far away, move and swat it. If it's close, just swat it.

+		if( DistToPhysicsEnt() > ZOMBIE_PHYSOBJ_SWATDIST )

+		{

+			return SCHED_ZOMBIE_MOVE_SWATITEM;

+		}

+		else

+		{

+			return SCHED_ZOMBIE_SWATITEM;

+		}

+		break;

+

+	case SCHED_STANDOFF:

+		return SCHED_ZOMBIE_WANDER_STANDOFF;

+

+	case SCHED_MELEE_ATTACK1:

+		return SCHED_ZOMBIE_MELEE_ATTACK1;

+	}

+

+	return BaseClass::TranslateSchedule( scheduleType );

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Allows for modification of the interrupt mask for the current schedule.

+//			In the most cases the base implementation should be called first.

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::BuildScheduleTestBits( void )

+{

+	// Ignore damage if we were recently damaged or we're attacking.

+	if ( GetActivity() == ACT_MELEE_ATTACK1 )

+	{

+		ClearCustomInterruptCondition( COND_LIGHT_DAMAGE );

+		ClearCustomInterruptCondition( COND_HEAVY_DAMAGE );

+	}

+#ifndef HL2_EPISODIC

+	else if ( m_flNextFlinch >= gpGlobals->curtime )

+	{

+		ClearCustomInterruptCondition( COND_LIGHT_DAMAGE );

+		ClearCustomInterruptCondition( COND_HEAVY_DAMAGE );

+	}

+#endif // !HL2_EPISODIC

+

+	// Everything should be interrupted if we get killed.

+	SetCustomInterruptCondition( COND_ZOMBIE_RELEASECRAB );

+

+	BaseClass::BuildScheduleTestBits();

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Called when we change schedules.

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::OnScheduleChange( void )

+{

+	//

+	// If we took damage and changed schedules, ignore further damage for a few seconds.

+	//

+	if ( HasCondition( COND_LIGHT_DAMAGE ) || HasCondition( COND_HEAVY_DAMAGE ))

+	{

+		m_flNextFlinch = gpGlobals->curtime + ZOMBIE_FLINCH_DELAY;

+	} 

+

+	BaseClass::OnScheduleChange();

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+int	CNPC_BaseZombie::SelectFailSchedule( int failedSchedule, int failedTask, AI_TaskFailureCode_t taskFailCode )

+{

+	if( failedSchedule == SCHED_ZOMBIE_WANDER_MEDIUM )

+	{

+		return SCHED_ZOMBIE_WANDER_FAIL;

+	}

+

+	// If we can swat physics objects, see if we can swat our obstructor

+	if ( CanSwatPhysicsObjects() )

+	{

+		if ( !m_fIsTorso && IsPathTaskFailure( taskFailCode ) && 

+			 m_hObstructor != NULL && m_hObstructor->VPhysicsGetObject() && 

+			 m_hObstructor->VPhysicsGetObject()->GetMass() < 100 )

+		{

+			m_hPhysicsEnt = m_hObstructor;

+			m_hObstructor = NULL;

+			return SCHED_ZOMBIE_ATTACKITEM;

+		}

+	}

+

+	m_hObstructor = NULL;

+

+	return BaseClass::SelectFailSchedule( failedSchedule, failedTask, taskFailCode );

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+int CNPC_BaseZombie::SelectSchedule ( void )

+{

+	if ( HasCondition( COND_ZOMBIE_RELEASECRAB ) )

+	{

+		// Death waits for no man. Or zombie. Or something.

+		return SCHED_ZOMBIE_RELEASECRAB;

+	}

+

+	if ( BehaviorSelectSchedule() )

+	{

+		return BaseClass::SelectSchedule();

+	}

+

+	switch ( m_NPCState )

+	{

+	case NPC_STATE_COMBAT:

+		if ( HasCondition( COND_NEW_ENEMY ) && GetEnemy() )

+		{

+			float flDist;

+

+			flDist = ( GetLocalOrigin() - GetEnemy()->GetLocalOrigin() ).Length();

+

+			// If this is a new enemy that's far away, ambush!!

+			if (flDist >= zombie_ambushdist.GetFloat() && MustCloseToAttack() )

+			{

+				return SCHED_ZOMBIE_MOVE_TO_AMBUSH;

+			}

+		}

+

+		if ( HasCondition( COND_LOST_ENEMY ) || ( HasCondition( COND_ENEMY_UNREACHABLE ) && MustCloseToAttack() ) )

+		{

+			return SCHED_ZOMBIE_WANDER_MEDIUM;

+		}

+

+		if( HasCondition( COND_ZOMBIE_CAN_SWAT_ATTACK ) )

+		{

+			return SCHED_ZOMBIE_SWATITEM;

+		}

+		break;

+

+	case NPC_STATE_ALERT:

+		if ( HasCondition( COND_LOST_ENEMY ) || HasCondition( COND_ENEMY_DEAD ) || ( HasCondition( COND_ENEMY_UNREACHABLE ) && MustCloseToAttack() ) )

+		{

+			ClearCondition( COND_LOST_ENEMY );

+			ClearCondition( COND_ENEMY_UNREACHABLE );

+

+#ifdef DEBUG_ZOMBIES

+			DevMsg("Wandering\n");

+#endif

+

+			// Just lost track of our enemy. 

+			// Wander around a bit so we don't look like a dingus.

+			return SCHED_ZOMBIE_WANDER_MEDIUM;

+		}

+		break;

+	}

+

+	return BaseClass::SelectSchedule();

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+bool CNPC_BaseZombie::IsSlumped( void )

+{

+	if( hl2_episodic.GetBool() )

+	{

+		if( m_ActBusyBehavior.IsInsideActBusy() && !m_ActBusyBehavior.IsStopBusying() )

+		{

+			return true;

+		}

+	}

+	else

+	{

+		int sequence = GetSequence();

+		if ( sequence != -1 )

+		{

+			return ( strncmp( GetSequenceName( sequence ), "slump", 5 ) == 0 );

+		}

+	}

+

+	return false;

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+bool CNPC_BaseZombie::IsGettingUp( void )

+{

+	if( m_ActBusyBehavior.IsActive() && m_ActBusyBehavior.IsStopBusying() )

+	{

+		return true;

+	}

+	return false;

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+int CNPC_BaseZombie::GetSwatActivity( void )

+{

+	// Hafta figure out whether to swat with left or right arm.

+	// Also hafta figure out whether to swat high or low. (later)

+	float		flDot;

+	Vector		vecRight, vecDirToObj;

+

+	AngleVectors( GetLocalAngles(), NULL, &vecRight, NULL );

+	

+	vecDirToObj = m_hPhysicsEnt->GetLocalOrigin() - GetLocalOrigin();

+	VectorNormalize(vecDirToObj);

+

+	// compare in 2D.

+	vecRight.z = 0.0;

+	vecDirToObj.z = 0.0;

+

+	flDot = DotProduct( vecRight, vecDirToObj );

+

+	Vector vecMyCenter;

+	Vector vecObjCenter;

+

+	vecMyCenter = WorldSpaceCenter();

+	vecObjCenter = m_hPhysicsEnt->WorldSpaceCenter();

+	float flZDiff;

+

+	flZDiff = vecMyCenter.z - vecObjCenter.z;

+

+	if( flDot >= 0 )

+	{

+		// Right

+		if( flZDiff < 0 )

+		{

+			return ACT_ZOM_SWATRIGHTMID;

+		}

+

+		return ACT_ZOM_SWATRIGHTLOW;

+	}

+	else

+	{

+		// Left

+		if( flZDiff < 0 )

+		{

+			return ACT_ZOM_SWATLEFTMID;

+		}

+

+		return ACT_ZOM_SWATLEFTLOW;

+	}

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::GatherConditions( void )

+{

+	ClearCondition( COND_ZOMBIE_LOCAL_MELEE_OBSTRUCTION );

+

+	BaseClass::GatherConditions();

+

+	if( m_NPCState == NPC_STATE_COMBAT && !m_fIsTorso )

+	{

+		// This check for !m_pPhysicsEnt prevents a crashing bug, but also

+		// eliminates the zombie picking a better physics object if one happens to fall

+		// between him and the object he's heading for already. 

+		if( gpGlobals->curtime >= m_flNextSwatScan && (m_hPhysicsEnt == NULL) )

+		{

+			FindNearestPhysicsObject( ZOMBIE_MAX_PHYSOBJ_MASS );

+			m_flNextSwatScan = gpGlobals->curtime + 2.0;

+		}

+	}

+

+	if( (m_hPhysicsEnt != NULL) && gpGlobals->curtime >= m_flNextSwat && HasCondition( COND_SEE_ENEMY ) && !HasCondition( COND_ZOMBIE_RELEASECRAB ) )

+	{

+		SetCondition( COND_ZOMBIE_CAN_SWAT_ATTACK );

+	}

+	else

+	{

+		ClearCondition( COND_ZOMBIE_CAN_SWAT_ATTACK );

+	}

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::PrescheduleThink( void )

+{

+	BaseClass::PrescheduleThink();

+	

+#if 0

+	DevMsg(" ** %d Angry Zombies **\n", s_iAngryZombies );

+#endif

+

+#if 0

+	if( m_NPCState == NPC_STATE_COMBAT )

+	{

+		// Zombies should make idle sounds in combat

+		if( random->RandomInt( 0, 30 ) == 0 )

+		{

+			IdleSound();

+		}

+	}	

+#endif 

+

+	//

+	// Cool off if we aren't burned for five seconds or so. 

+	//

+	if ( ( m_flBurnDamageResetTime ) && ( gpGlobals->curtime >= m_flBurnDamageResetTime ) )

+	{

+		m_flBurnDamage = 0;

+	}

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::StartTask( const Task_t *pTask )

+{

+	switch( pTask->iTask )

+	{

+	case TASK_ZOMBIE_DIE:

+		// Go to ragdoll

+		KillMe();

+		TaskComplete();

+		break;

+

+	case TASK_ZOMBIE_GET_PATH_TO_PHYSOBJ:

+		{

+			Vector vecGoalPos;

+			Vector vecDir;

+

+			vecDir = GetLocalOrigin() - m_hPhysicsEnt->GetLocalOrigin();

+			VectorNormalize(vecDir);

+			vecDir.z = 0;

+

+			AI_NavGoal_t goal( m_hPhysicsEnt->WorldSpaceCenter() );

+			goal.pTarget = m_hPhysicsEnt;

+			GetNavigator()->SetGoal( goal );

+

+			TaskComplete();

+		}

+		break;

+

+	case TASK_ZOMBIE_SWAT_ITEM:

+		{

+			if( m_hPhysicsEnt == NULL )

+			{

+				// Physics Object is gone! Probably was an explosive 

+				// or something else broke it.

+				TaskFail("Physics ent NULL");

+			}

+			else if ( DistToPhysicsEnt() > ZOMBIE_PHYSOBJ_SWATDIST )

+			{

+				// Physics ent is no longer in range! Probably another zombie swatted it or it moved

+				// for some other reason.

+				TaskFail( "Physics swat item has moved" );

+			}

+			else

+			{

+				SetIdealActivity( (Activity)GetSwatActivity() );

+			}

+			break;

+		}

+		break;

+

+	case TASK_ZOMBIE_DELAY_SWAT:

+		m_flNextSwat = gpGlobals->curtime + pTask->flTaskData;

+		TaskComplete();

+		break;

+

+	case TASK_ZOMBIE_RELEASE_HEADCRAB:

+		{

+			// make the crab look like it's pushing off the body

+			Vector vecForward;

+			Vector vecVelocity;

+

+			AngleVectors( GetAbsAngles(), &vecForward );

+			

+			vecVelocity = vecForward * 30;

+			vecVelocity.z += 100;

+

+			ReleaseHeadcrab( EyePosition(), vecVelocity, true, true );

+			TaskComplete();

+		}

+		break;

+

+	case TASK_ZOMBIE_WAIT_POST_MELEE:

+		{

+#ifndef HL2_EPISODIC

+			TaskComplete();

+			return;

+#endif

+

+			// Don't wait when attacking the player

+			if ( GetEnemy() && GetEnemy()->IsPlayer() )

+			{

+				TaskComplete();

+				return;

+			}

+

+			// Wait a single think

+			SetWait( 0.1 );

+		}

+		break;

+

+	default:

+		BaseClass::StartTask( pTask );

+	}

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::RunTask( const Task_t *pTask )

+{

+	switch( pTask->iTask )

+	{

+	case TASK_ZOMBIE_SWAT_ITEM:

+		if( IsActivityFinished() )

+		{

+			TaskComplete();

+		}

+		break;

+

+	case TASK_ZOMBIE_WAIT_POST_MELEE:

+		{

+			if ( IsWaitFinished() )

+			{

+				TaskComplete();

+			}

+		}

+		break;

+	default:

+		BaseClass::RunTask( pTask );

+		break;

+	}

+}

+

+

+//---------------------------------------------------------

+// Make the necessary changes to a zombie to make him a 

+// torso!

+//---------------------------------------------------------

+void CNPC_BaseZombie::BecomeTorso( const Vector &vecTorsoForce, const Vector &vecLegsForce )

+{

+	if( m_fIsTorso )

+	{

+		DevMsg( "*** Zombie is already a torso!\n" );

+		return;

+	}

+

+	if( IsOnFire() )

+	{

+		Extinguish();

+		Ignite( 30 );

+	}

+

+	if ( !m_fIsHeadless )

+	{

+		m_iMaxHealth = ZOMBIE_TORSO_HEALTH_FACTOR * m_iMaxHealth;

+		m_iHealth = m_iMaxHealth;

+

+		// No more opening doors!

+		CapabilitiesRemove( bits_CAP_DOORS_GROUP );

+		

+		ClearSchedule( "Becoming torso" );

+		GetNavigator()->ClearGoal();

+		m_hPhysicsEnt = NULL;

+

+		// Put the zombie in a TOSS / fall schedule

+		// Otherwise he fails and sits on the ground for a sec.

+		SetSchedule( SCHED_FALL_TO_GROUND );

+

+		m_fIsTorso = true;

+

+		// Put the torso up where the torso was when the zombie

+		// was whole.

+		Vector origin = GetAbsOrigin();

+		origin.z += 40;

+		SetAbsOrigin( origin );

+

+		SetGroundEntity( NULL );

+		// assume zombie mass ~ 100 kg

+		ApplyAbsVelocityImpulse( vecTorsoForce * (1.0 / 100.0) );

+	}

+

+	float flFadeTime = 0.0;

+

+	if( HasSpawnFlags( SF_NPC_FADE_CORPSE ) )

+	{

+		flFadeTime = 5.0;

+	}

+

+	if ( m_fIsTorso == true )

+	{

+		// -40 on Z to make up for the +40 on Z that we did above. This stops legs spawning above the head.

+		CBaseEntity *pGib = CreateRagGib( GetLegsModel(), GetAbsOrigin() - Vector(0, 0, 40), GetAbsAngles(), vecLegsForce, flFadeTime );

+

+		// don't collide with this thing ever

+		if ( pGib )

+		{

+			pGib->SetOwnerEntity( this );

+		}

+	}

+

+

+	SetZombieModel();

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::Event_Killed( const CTakeDamageInfo &info )

+{

+	if ( info.GetDamageType() & DMG_VEHICLE )

+	{

+		Vector vecDamageDir = info.GetDamageForce();

+		VectorNormalize( vecDamageDir );

+

+		// Big blood splat

+		UTIL_BloodSpray( WorldSpaceCenter(), vecDamageDir, BLOOD_COLOR_YELLOW, 8, FX_BLOODSPRAY_CLOUD );

+	}

+

+   	BaseClass::Event_Killed( info );

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+bool CNPC_BaseZombie::BecomeRagdoll( const CTakeDamageInfo &info, const Vector &forceVector )

+{

+	bool bKilledByVehicle = ( ( info.GetDamageType() & DMG_VEHICLE ) != 0 );

+	if( m_fIsTorso || (!IsChopped(info) && !IsSquashed(info)) || bKilledByVehicle )

+	{

+		return BaseClass::BecomeRagdoll( info, forceVector );

+	}

+

+	if( !(GetFlags()&FL_TRANSRAGDOLL) )

+	{

+		RemoveDeferred();

+	}

+

+	return true;

+}

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::StopLoopingSounds()

+{

+	ENVELOPE_CONTROLLER.SoundDestroy( m_pMoanSound );

+	m_pMoanSound = NULL;

+

+	BaseClass::StopLoopingSounds();

+}

+

+

+//---------------------------------------------------------

+//---------------------------------------------------------

+void CNPC_BaseZombie::RemoveHead( void )

+{

+	m_fIsHeadless = true;

+	SetZombieModel();

+}

+

+

+bool CNPC_BaseZombie::ShouldPlayFootstepMoan( void )

+{

+	if( random->RandomInt( 1, zombie_stepfreq.GetInt() * s_iAngryZombies ) == 1 )

+	{

+		return true;

+	}

+

+	return false;

+}

+

+

+#define ZOMBIE_CRAB_INHERITED_SPAWNFLAGS	(SF_NPC_GAG|SF_NPC_LONG_RANGE|SF_NPC_FADE_CORPSE|SF_NPC_ALWAYSTHINK)

+#define CRAB_HULL_EXPAND	1.1f

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::HeadcrabFits( CBaseAnimating *pCrab )

+{

+	Vector vecSpawnLoc = pCrab->GetAbsOrigin();

+

+	CTraceFilterSimpleList traceFilter( COLLISION_GROUP_NONE );

+	traceFilter.AddEntityToIgnore( pCrab );

+	traceFilter.AddEntityToIgnore( this );

+	if ( GetInteractionPartner() )

+	{

+		traceFilter.AddEntityToIgnore( GetInteractionPartner() );

+	}

+

+	trace_t tr;

+	AI_TraceHull(	vecSpawnLoc,

+					vecSpawnLoc - Vector( 0, 0, 1 ), 

+					NAI_Hull::Mins(HULL_TINY) * CRAB_HULL_EXPAND,

+					NAI_Hull::Maxs(HULL_TINY) * CRAB_HULL_EXPAND,

+					MASK_NPCSOLID,

+					&traceFilter,

+					&tr );

+

+	if( tr.fraction != 1.0 )

+	{

+		//NDebugOverlay::Box( vecSpawnLoc, NAI_Hull::Mins(HULL_TINY) * CRAB_HULL_EXPAND, NAI_Hull::Maxs(HULL_TINY) * CRAB_HULL_EXPAND, 255, 0, 0, 100, 10.0 );

+		return false;

+	}

+

+	//NDebugOverlay::Box( vecSpawnLoc, NAI_Hull::Mins(HULL_TINY) * CRAB_HULL_EXPAND, NAI_Hull::Maxs(HULL_TINY) * CRAB_HULL_EXPAND, 0, 255, 0, 100, 10.0 );

+	return true;

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+// Input  : &vecOrigin - 

+//			&vecVelocity - 

+//			fRemoveHead - 

+//			fRagdollBody - 

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::ReleaseHeadcrab( const Vector &vecOrigin, const Vector &vecVelocity, bool fRemoveHead, bool fRagdollBody, bool fRagdollCrab )

+{

+	CAI_BaseNPC		*pCrab;

+	Vector vecSpot = vecOrigin;

+

+	// Until the headcrab is a bodygroup, we have to approximate the

+	// location of the head with magic numbers.

+	if( !m_fIsTorso )

+	{

+		vecSpot.z -= 16;

+	}

+

+	if( fRagdollCrab )

+	{

+		//Vector vecForce = Vector( 0, 0, random->RandomFloat( 700, 1100 ) );

+		CBaseEntity *pGib = CreateRagGib( GetHeadcrabModel(), vecOrigin, GetLocalAngles(), vecVelocity, 15, ShouldIgniteZombieGib() );

+

+		if ( pGib )

+		{

+			CBaseAnimating *pAnimatingGib = dynamic_cast<CBaseAnimating*>(pGib);

+

+			// don't collide with this thing ever

+			int iCrabAttachment = LookupAttachment( "headcrab" );

+			if (iCrabAttachment > 0 && pAnimatingGib )

+			{

+				SetHeadcrabSpawnLocation( iCrabAttachment, pAnimatingGib );

+			}

+

+			if( !HeadcrabFits(pAnimatingGib) )

+			{

+				UTIL_Remove(pGib);

+				return;

+			}

+

+			pGib->SetOwnerEntity( this );

+			CopyRenderColorTo( pGib );

+

+			

+			if( UTIL_ShouldShowBlood(BLOOD_COLOR_YELLOW) )

+			{

+				UTIL_BloodImpact( pGib->WorldSpaceCenter(), Vector(0,0,1), BLOOD_COLOR_YELLOW, 1 );

+

+				for ( int i = 0 ; i < 3 ; i++ )

+				{

+					Vector vecSpot = pGib->WorldSpaceCenter();

+					

+					vecSpot.x += random->RandomFloat( -8, 8 ); 

+					vecSpot.y += random->RandomFloat( -8, 8 ); 

+					vecSpot.z += random->RandomFloat( -8, 8 ); 

+

+					UTIL_BloodDrips( vecSpot, vec3_origin, BLOOD_COLOR_YELLOW, 50 );

+				}

+			}

+		}

+	}

+	else

+	{

+		pCrab = (CAI_BaseNPC*)CreateEntityByName( GetHeadcrabClassname() );

+

+		if ( !pCrab )

+		{

+			Warning( "**%s: Can't make %s!\n", GetClassname(), GetHeadcrabClassname() );

+			return;

+		}

+

+		// Stick the crab in whatever squad the zombie was in.

+		pCrab->SetSquadName( m_SquadName );

+

+		// don't pop to floor, fall

+		pCrab->AddSpawnFlags( SF_NPC_FALL_TO_GROUND );

+		

+		// add on the parent flags

+		pCrab->AddSpawnFlags( m_spawnflags & ZOMBIE_CRAB_INHERITED_SPAWNFLAGS );

+		

+		// make me the crab's owner to avoid collision issues

+		pCrab->SetOwnerEntity( this );

+

+		pCrab->SetAbsOrigin( vecSpot );

+		pCrab->SetAbsAngles( GetAbsAngles() );

+		DispatchSpawn( pCrab );

+

+		pCrab->GetMotor()->SetIdealYaw( GetAbsAngles().y );

+

+		// FIXME: npc's with multiple headcrabs will need some way to query different attachments.

+		// NOTE: this has till after spawn is called so that the model is set up

+		int iCrabAttachment = LookupAttachment( "headcrab" );

+		if (iCrabAttachment > 0)

+		{

+			SetHeadcrabSpawnLocation( iCrabAttachment, pCrab );

+			pCrab->GetMotor()->SetIdealYaw( pCrab->GetAbsAngles().y );

+			

+			// Take out any pitch

+			QAngle angles = pCrab->GetAbsAngles();

+			angles.x = 0.0;

+			pCrab->SetAbsAngles( angles );

+		}

+

+		if( !HeadcrabFits(pCrab) )

+		{

+			UTIL_Remove(pCrab);

+			return;

+		}

+

+		pCrab->SetActivity( ACT_IDLE );

+		pCrab->SetNextThink( gpGlobals->curtime );

+		pCrab->PhysicsSimulate();

+		pCrab->SetAbsVelocity( vecVelocity );

+

+		// if I have an enemy, stuff that to the headcrab.

+		CBaseEntity *pEnemy;

+		pEnemy = GetEnemy();

+

+		pCrab->m_flNextAttack = gpGlobals->curtime + 1.0f;

+

+		if( pEnemy )

+		{

+			pCrab->SetEnemy( pEnemy );

+		}

+		if( ShouldIgniteZombieGib() )

+		{

+			pCrab->Ignite( 30 );

+		}

+

+		CopyRenderColorTo( pCrab );

+

+		pCrab->Activate();

+	}

+

+	if( fRemoveHead )

+	{

+		RemoveHead();

+	}

+

+	if( fRagdollBody )

+	{

+		BecomeRagdollOnClient( vec3_origin );

+	}

+}

+

+

+

+void CNPC_BaseZombie::SetHeadcrabSpawnLocation( int iCrabAttachment, CBaseAnimating *pCrab )

+{

+	Assert( iCrabAttachment > 0 );

+

+	// get world location of intended headcrab root bone

+	matrix3x4_t attachmentToWorld;

+	GetAttachment( iCrabAttachment, attachmentToWorld );

+

+	// find offset of root bone from origin 

+	pCrab->SetAbsOrigin( Vector( 0, 0, 0 ) );

+	pCrab->SetAbsAngles( QAngle( 0, 0, 0 ) );

+	pCrab->InvalidateBoneCache();

+	matrix3x4_t rootLocal;

+	pCrab->GetBoneTransform( 0, rootLocal );

+

+	// invert it

+	matrix3x4_t rootInvLocal;

+	MatrixInvert( rootLocal, rootInvLocal );

+

+	// find spawn location needed for rootLocal transform to match attachmentToWorld

+	matrix3x4_t spawnOrigin;

+	ConcatTransforms( attachmentToWorld, rootInvLocal, spawnOrigin );

+

+	// reset location of headcrab

+	Vector vecOrigin;

+	QAngle vecAngles;

+	MatrixAngles( spawnOrigin, vecAngles, vecOrigin );

+	pCrab->SetAbsOrigin( vecOrigin );

+	

+	// FIXME: head crabs don't like pitch or roll!

+	vecAngles.z = 0;

+

+	pCrab->SetAbsAngles( vecAngles );

+	pCrab->InvalidateBoneCache();

+}

+

+

+

+//---------------------------------------------------------

+// Provides a standard way for the zombie to get the 

+// distance to a physics ent. Since the code to find physics 

+// objects uses a fast dis approx, we have to use that here

+// as well.

+//---------------------------------------------------------

+float CNPC_BaseZombie::DistToPhysicsEnt( void )

+{

+	//return ( GetLocalOrigin() - m_hPhysicsEnt->GetLocalOrigin() ).Length();

+	if ( m_hPhysicsEnt != NULL )

+		return UTIL_DistApprox2D( GetAbsOrigin(), m_hPhysicsEnt->WorldSpaceCenter() );

+	return ZOMBIE_PHYSOBJ_SWATDIST + 1;

+}

+

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::OnStateChange( NPC_STATE OldState, NPC_STATE NewState )

+{

+	switch( NewState )

+	{

+	case NPC_STATE_COMBAT:

+		{

+			RemoveSpawnFlags( SF_NPC_GAG );

+			s_iAngryZombies++;

+		}

+		break;

+

+	default:

+		if( OldState == NPC_STATE_COMBAT )

+		{

+			// Only decrement if coming OUT of combat state.

+			s_iAngryZombies--;

+		}

+		break;

+	}

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Refines a base activity into something more specific to our internal state.

+//-----------------------------------------------------------------------------

+Activity CNPC_BaseZombie::NPC_TranslateActivity( Activity baseAct )

+{

+	if ( baseAct == ACT_WALK && IsCurSchedule( SCHED_COMBAT_PATROL, false) )

+		baseAct = ACT_RUN;

+

+	if ( IsOnFire() )

+	{

+		switch ( baseAct )

+		{

+			case ACT_RUN_ON_FIRE:

+			{

+				return ( Activity )ACT_WALK_ON_FIRE;

+			}

+

+			case ACT_WALK:

+			{

+				// I'm on fire. Put ME out.

+				return ( Activity )ACT_WALK_ON_FIRE;

+			}

+

+			case ACT_IDLE:

+			{

+				// I'm on fire. Put ME out.

+				return ( Activity )ACT_IDLE_ON_FIRE;

+			}

+		}

+	}

+

+	return BaseClass::NPC_TranslateActivity( baseAct );

+}

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+Vector CNPC_BaseZombie::BodyTarget( const Vector &posSrc, bool bNoisy ) 

+{ 

+	

+	if( IsCurSchedule(SCHED_BIG_FLINCH) || m_ActBusyBehavior.IsActive() )

+	{

+		// This zombie is assumed to be standing up. 

+		// Return a position that's centered over the absorigin,

+		// halfway between the origin and the head. 

+		Vector vecTarget = GetAbsOrigin();

+		Vector vecHead = HeadTarget( posSrc );

+		vecTarget.z = ((vecTarget.z + vecHead.z) * 0.5f);

+		return vecTarget;

+	}

+

+	return BaseClass::BodyTarget( posSrc, bNoisy );

+}

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+Vector CNPC_BaseZombie::HeadTarget( const Vector &posSrc )

+{

+	int iCrabAttachment = LookupAttachment( "headcrab" );

+	Assert( iCrabAttachment > 0 );

+

+	Vector vecPosition;

+

+	GetAttachment( iCrabAttachment, vecPosition );

+

+	return vecPosition;

+}

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+float CNPC_BaseZombie::GetAutoAimRadius()

+{

+	if( m_fIsTorso )

+	{

+		return 12.0f;

+	}

+

+	return BaseClass::GetAutoAimRadius();

+}

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+bool CNPC_BaseZombie::OnInsufficientStopDist( AILocalMoveGoal_t *pMoveGoal, float distClear, AIMoveResult_t *pResult )

+{

+	if ( pMoveGoal->directTrace.fStatus == AIMR_BLOCKED_ENTITY && gpGlobals->curtime >= m_flNextSwat )

+	{

+		m_hObstructor = pMoveGoal->directTrace.pObstruction;

+	}

+	

+	return false;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+// Input  : *pEnemy - 

+//			&chasePosition - 

+//-----------------------------------------------------------------------------

+void CNPC_BaseZombie::TranslateNavGoal( CBaseEntity *pEnemy, Vector &chasePosition )

+{

+	// If our enemy is in a vehicle, we need them to tell us where to navigate to them

+	if ( pEnemy == NULL )

+		return;

+

+	CBaseCombatCharacter *pBCC = pEnemy->MyCombatCharacterPointer();

+	if ( pBCC && pBCC->IsInAVehicle() )

+	{

+		Vector vecForward, vecRight;

+		pBCC->GetVectors( &vecForward, &vecRight, NULL );

+

+		chasePosition = pBCC->WorldSpaceCenter() + ( vecForward * 24.0f ) + ( vecRight * 48.0f );

+		return;

+	}

+

+	BaseClass::TranslateNavGoal( pEnemy, chasePosition );

+}

+

+//-----------------------------------------------------------------------------

+//

+// Schedules

+//

+//-----------------------------------------------------------------------------

+

+AI_BEGIN_CUSTOM_NPC( base_zombie, CNPC_BaseZombie )

+

+	DECLARE_TASK( TASK_ZOMBIE_DELAY_SWAT )

+	DECLARE_TASK( TASK_ZOMBIE_SWAT_ITEM )

+	DECLARE_TASK( TASK_ZOMBIE_GET_PATH_TO_PHYSOBJ )

+	DECLARE_TASK( TASK_ZOMBIE_DIE )

+	DECLARE_TASK( TASK_ZOMBIE_RELEASE_HEADCRAB )

+	DECLARE_TASK( TASK_ZOMBIE_WAIT_POST_MELEE )

+

+	DECLARE_ACTIVITY( ACT_ZOM_SWATLEFTMID )

+	DECLARE_ACTIVITY( ACT_ZOM_SWATRIGHTMID )

+	DECLARE_ACTIVITY( ACT_ZOM_SWATLEFTLOW )

+	DECLARE_ACTIVITY( ACT_ZOM_SWATRIGHTLOW )

+	DECLARE_ACTIVITY( ACT_ZOM_RELEASECRAB )

+	DECLARE_ACTIVITY( ACT_ZOM_FALL )

+

+	DECLARE_CONDITION( COND_ZOMBIE_CAN_SWAT_ATTACK )

+	DECLARE_CONDITION( COND_ZOMBIE_RELEASECRAB )

+	DECLARE_CONDITION( COND_ZOMBIE_LOCAL_MELEE_OBSTRUCTION )

+

+	//Adrian: events go here

+	DECLARE_ANIMEVENT( AE_ZOMBIE_ATTACK_RIGHT )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_ATTACK_LEFT )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_ATTACK_BOTH )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_SWATITEM )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_STARTSWAT )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_STEP_LEFT )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_STEP_RIGHT )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_SCUFF_LEFT )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_SCUFF_RIGHT )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_ATTACK_SCREAM )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_GET_UP )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_POUND )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_ALERTSOUND )

+	DECLARE_ANIMEVENT( AE_ZOMBIE_POPHEADCRAB )

+

+	DECLARE_INTERACTION( g_interactionZombieMeleeWarning )

+

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_MOVE_SWATITEM,

+

+		"	Tasks"

+		"		TASK_ZOMBIE_DELAY_SWAT			3"

+		"		TASK_SET_FAIL_SCHEDULE			SCHEDULE:SCHED_CHASE_ENEMY"

+		"		TASK_ZOMBIE_GET_PATH_TO_PHYSOBJ	0"

+		"		TASK_WALK_PATH					0"

+		"		TASK_WAIT_FOR_MOVEMENT			0"

+		"		TASK_FACE_ENEMY					0"

+		"		TASK_ZOMBIE_SWAT_ITEM			0"

+		"	"

+		"	Interrupts"

+		"		COND_ZOMBIE_RELEASECRAB"

+		"		COND_ENEMY_DEAD"

+		"		COND_NEW_ENEMY"

+	)

+

+	//=========================================================

+	// SwatItem

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_SWATITEM,

+

+		"	Tasks"

+		"		TASK_ZOMBIE_DELAY_SWAT			3"

+		"		TASK_SET_FAIL_SCHEDULE			SCHEDULE:SCHED_CHASE_ENEMY"

+		"		TASK_FACE_ENEMY					0"

+		"		TASK_ZOMBIE_SWAT_ITEM			0"

+		"	"

+		"	Interrupts"

+		"		COND_ZOMBIE_RELEASECRAB"

+		"		COND_ENEMY_DEAD"

+		"		COND_NEW_ENEMY"

+	)

+

+	//=========================================================

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_ATTACKITEM,

+

+		"	Tasks"

+		"		TASK_FACE_ENEMY					0"

+		"		TASK_MELEE_ATTACK1				0"

+		"	"

+		"	Interrupts"

+		"		COND_ZOMBIE_RELEASECRAB"

+		"		COND_ENEMY_DEAD"

+		"		COND_NEW_ENEMY"

+	)

+

+	//=========================================================

+	// ChaseEnemy

+	//=========================================================

+#ifdef HL2_EPISODIC

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_CHASE_ENEMY,

+

+		"	Tasks"

+		"		 TASK_SET_FAIL_SCHEDULE			SCHEDULE:SCHED_CHASE_ENEMY_FAILED"

+		"		 TASK_SET_TOLERANCE_DISTANCE	24"

+		"		 TASK_GET_CHASE_PATH_TO_ENEMY	600"

+		"		 TASK_RUN_PATH					0"

+		"		 TASK_WAIT_FOR_MOVEMENT			0"

+		"		 TASK_FACE_ENEMY				0"

+		"	"

+		"	Interrupts"

+		"		COND_NEW_ENEMY"

+		"		COND_ENEMY_DEAD"

+		"		COND_ENEMY_UNREACHABLE"

+		"		COND_CAN_RANGE_ATTACK1"

+		"		COND_CAN_MELEE_ATTACK1"

+		"		COND_CAN_RANGE_ATTACK2"

+		"		COND_CAN_MELEE_ATTACK2"

+		"		COND_TOO_CLOSE_TO_ATTACK"

+		"		COND_TASK_FAILED"

+		"		COND_ZOMBIE_CAN_SWAT_ATTACK"

+		"		COND_ZOMBIE_RELEASECRAB"

+		"		COND_HEAVY_DAMAGE"

+	)

+#else 

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_CHASE_ENEMY,

+

+		"	Tasks"

+		"		 TASK_SET_FAIL_SCHEDULE			SCHEDULE:SCHED_CHASE_ENEMY_FAILED"

+		"		 TASK_SET_TOLERANCE_DISTANCE	24"

+		"		 TASK_GET_CHASE_PATH_TO_ENEMY	600"

+		"		 TASK_RUN_PATH					0"

+		"		 TASK_WAIT_FOR_MOVEMENT			0"

+		"		 TASK_FACE_ENEMY				0"

+		"	"

+		"	Interrupts"

+		"		COND_NEW_ENEMY"

+		"		COND_ENEMY_DEAD"

+		"		COND_ENEMY_UNREACHABLE"

+		"		COND_CAN_RANGE_ATTACK1"

+		"		COND_CAN_MELEE_ATTACK1"

+		"		COND_CAN_RANGE_ATTACK2"

+		"		COND_CAN_MELEE_ATTACK2"

+		"		COND_TOO_CLOSE_TO_ATTACK"

+		"		COND_TASK_FAILED"

+		"		COND_ZOMBIE_CAN_SWAT_ATTACK"

+		"		COND_ZOMBIE_RELEASECRAB"

+	)

+#endif // HL2_EPISODIC

+

+

+	//=========================================================

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_RELEASECRAB,

+

+		"	Tasks"

+		"		TASK_PLAY_PRIVATE_SEQUENCE_FACE_ENEMY		ACTIVITY:ACT_ZOM_RELEASECRAB"

+		"		TASK_ZOMBIE_RELEASE_HEADCRAB				0"

+		"		TASK_ZOMBIE_DIE								0"

+		"	"

+		"	Interrupts"

+		"		COND_TASK_FAILED"

+	)

+

+

+	//=========================================================

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_MOVE_TO_AMBUSH,

+

+		"	Tasks"

+		"		TASK_WAIT						1.0" // don't react as soon as you see the player.

+		"		TASK_FIND_COVER_FROM_ENEMY		0"

+		"		TASK_WALK_PATH					0"

+		"		TASK_WAIT_FOR_MOVEMENT			0"

+		"		TASK_STOP_MOVING				0"

+		"		TASK_TURN_LEFT					180"

+		"		TASK_SET_SCHEDULE				SCHEDULE:SCHED_ZOMBIE_WAIT_AMBUSH"

+		"	"

+		"	Interrupts"

+		"		COND_TASK_FAILED"

+		"		COND_NEW_ENEMY"

+	)

+

+

+	//=========================================================

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_WAIT_AMBUSH,

+

+		"	Tasks"

+		"		TASK_WAIT_FACE_ENEMY	99999"

+		"	"

+		"	Interrupts"

+		"		COND_NEW_ENEMY"

+		"		COND_SEE_ENEMY"

+	)

+

+	//=========================================================

+	// Wander around for a while so we don't look stupid. 

+	// this is done if we ever lose track of our enemy.

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_WANDER_MEDIUM,

+

+		"	Tasks"

+		"		TASK_STOP_MOVING				0"

+		"		TASK_WANDER						480384" // 4 feet to 32 feet

+		"		TASK_WALK_PATH					0"

+		"		TASK_WAIT_FOR_MOVEMENT			0"

+		"		TASK_STOP_MOVING				0"

+		"		TASK_WAIT_PVS					0" // if the player left my PVS, just wait.

+		"		TASK_SET_SCHEDULE				SCHEDULE:SCHED_ZOMBIE_WANDER_MEDIUM" // keep doing it

+		"	"

+		"	Interrupts"

+		"		COND_NEW_ENEMY"

+		"		COND_SEE_ENEMY"

+		"		COND_LIGHT_DAMAGE"

+		"		COND_HEAVY_DAMAGE"

+	)

+

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_WANDER_STANDOFF,

+

+		"	Tasks"

+		"		TASK_STOP_MOVING				0"

+		"		TASK_WANDER						480384" // 4 feet to 32 feet

+		"		TASK_WALK_PATH					0"

+		"		TASK_WAIT_FOR_MOVEMENT			0"

+		"		TASK_STOP_MOVING				0"

+		"		TASK_WAIT_PVS					0" // if the player left my PVS, just wait.

+		"	"

+		"	Interrupts"

+		"		COND_NEW_ENEMY"

+		"		COND_LIGHT_DAMAGE"

+		"		COND_HEAVY_DAMAGE"

+		"		COND_ENEMY_DEAD"

+		"		COND_CAN_RANGE_ATTACK1"

+		"		COND_CAN_MELEE_ATTACK1"

+		"		COND_CAN_RANGE_ATTACK2"

+		"		COND_CAN_MELEE_ATTACK2"

+		"		COND_ZOMBIE_RELEASECRAB"

+	)

+

+	//=========================================================

+	// If you fail to wander, wait just a bit and try again.

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_WANDER_FAIL,

+

+		"	Tasks"

+		"		TASK_STOP_MOVING		0"

+		"		TASK_WAIT				1"

+		"		TASK_SET_SCHEDULE		SCHEDULE:SCHED_ZOMBIE_WANDER_MEDIUM"

+		"	Interrupts"

+		"		COND_NEW_ENEMY"

+		"		COND_LIGHT_DAMAGE"

+		"		COND_HEAVY_DAMAGE"

+		"		COND_ENEMY_DEAD"

+		"		COND_CAN_RANGE_ATTACK1"

+		"		COND_CAN_MELEE_ATTACK1"

+		"		COND_CAN_RANGE_ATTACK2"

+		"		COND_CAN_MELEE_ATTACK2"

+		"		COND_ZOMBIE_RELEASECRAB"

+	)

+

+	//=========================================================

+	// Like the base class, only don't stop in the middle of 

+	// swinging if the enemy is killed, hides, or new enemy.

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_MELEE_ATTACK1,

+

+		"	Tasks"

+		"		TASK_STOP_MOVING		0"

+		"		TASK_FACE_ENEMY			0"

+		"		TASK_ANNOUNCE_ATTACK	1"	// 1 = primary attack

+		"		TASK_MELEE_ATTACK1		0"

+		"		TASK_SET_SCHEDULE		SCHEDULE:SCHED_ZOMBIE_POST_MELEE_WAIT"

+		""

+		"	Interrupts"

+		"		COND_LIGHT_DAMAGE"

+		"		COND_HEAVY_DAMAGE"

+	)

+

+	//=========================================================

+	// Make the zombie wait a frame after a melee attack, to

+	// allow itself & it's enemy to test for dynamic scripted sequences.

+	//=========================================================

+	DEFINE_SCHEDULE

+	(

+		SCHED_ZOMBIE_POST_MELEE_WAIT,

+

+		"	Tasks"

+		"		TASK_ZOMBIE_WAIT_POST_MELEE		0"

+	)

+

+AI_END_CUSTOM_NPC()