thirtyflightsofloving/game/g_ai.c

/*
===========================================================================
Copyright (C) 1997-2001 Id Software, Inc.
Copyright (C) 2000-2002 Mr. Hyde and Mad Dog

This file is part of Lazarus Quake 2 Mod source code.

Lazarus Quake 2 Mod source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

Lazarus Quake 2 Mod source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Lazarus Quake 2 Mod source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

// g_ai.c

#include "g_local.h"

qboolean FindTarget (edict_t *self);
extern cvar_t	*maxclients;

qboolean ai_checkattack (edict_t *self, float dist);
edict_t *medic_FindDeadMonster (edict_t *self);

qboolean	enemy_vis;
qboolean	enemy_infront;
int			enemy_range;
float		enemy_yaw;
/*
=================
AI_SetSightClient

Called once each frame to set level.sight_client to the
player to be checked for in findtarget.

If all clients are either dead or in notarget, sight_client
will be null.

In coop games, sight_client will cycle between the clients.
=================
*/
void AI_SetSightClient (void)
{
	edict_t	*ent;
	int		start, check;

	if (level.sight_client == NULL)
		start = 1;
	else
		start = level.sight_client - g_edicts;

	check = start;
	while (1)
	{
		check++;
		if (check > game.maxclients)
			check = 1;
		ent = &g_edicts[check];
		if (ent->inuse
			&& ent->health > 0
			&& !(ent->flags & (FL_NOTARGET|FL_DISGUISED) ) )
		{
			// If player is using func_monitor, make
			// the sight_client = the fake player at the
			// monitor currently taking the player's place.
			// Do NOT do this for players using a
			// target_monitor, though... in this case
			// both player and fake player are ignored.
			if (ent->client && ent->client->camplayer)
			{
				if (ent->client->spycam)
				{
					level.sight_client = ent->client->camplayer;
					return;
				}
			}
			else
			{
				level.sight_client = ent;
				return;		// got one
			}
		}
		if (check == start)
		{
			level.sight_client = NULL;
			return;		// nobody to see
		}
	}
}

//============================================================================

/*
=============
ai_move

Move the specified distance at current facing.
This replaces the QC functions: ai_forward, ai_back, ai_pain, and ai_painforward
==============
*/
void ai_move (edict_t *self, float dist)
{
	M_walkmove (self, self->s.angles[YAW], dist);
}


/*
=============
ai_stand

Used for standing around and looking for players
Distance is for slight position adjustments needed by the animations
==============
*/
void ai_stand (edict_t *self, float dist)
{
	vec3_t	v;

	if (dist)
		M_walkmove (self, self->s.angles[YAW], dist);

	if (self->monsterinfo.aiflags & AI_FOLLOW_LEADER)
	{
		if (!self->enemy || !self->enemy->inuse)
		{
			self->movetarget = self->goalentity = self->monsterinfo.leader;
			self->monsterinfo.aiflags &= ~(AI_STAND_GROUND | AI_TEMP_STAND_GROUND);
			self->monsterinfo.pausetime = 0;
		}
	}

	if ( (self->monsterinfo.aiflags & AI_CHICKEN) )
	{
		if ( (level.framenum - self->monsterinfo.chicken_framenum > 200) ||
			 (self->enemy && (self->enemy->last_attacked_framenum > level.framenum - 2) ) )
		{
			self->monsterinfo.aiflags &= ~(AI_CHICKEN | AI_STAND_GROUND);
			self->monsterinfo.pausetime = 0;
			if (self->enemy)
				FoundTarget(self);
		}
	}

	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
	{
		if (self->enemy && self->enemy->inuse)
		{
			float	length;

			VectorSubtract (self->enemy->s.origin, self->s.origin, v);
			length = VectorLength(v);
			self->ideal_yaw = vectoyaw(v);

			if ((level.time >= self->monsterinfo.rangetime) && (self->monsterinfo.aiflags & AI_RANGE_PAUSE))
			{
				if ((length < self->monsterinfo.ideal_range[0]) && (rand() & 3))
					self->monsterinfo.rangetime = level.time + 0.5;
				if ((length < self->monsterinfo.ideal_range[1]) && (length > self->monsterinfo.ideal_range[0]) && (rand() & 1))
					self->monsterinfo.rangetime = level.time + 0.2;
			}

			if (self->s.angles[YAW] != self->ideal_yaw && self->monsterinfo.aiflags & AI_RANGE_PAUSE)
			{
				if (self->monsterinfo.rangetime < level.time)
				{
					// Lazarus: Don't run if we're still too close
					if (self->monsterinfo.min_range > 0)
					{
						if (length > self->monsterinfo.min_range)
						{
							self->monsterinfo.aiflags &= ~(AI_STAND_GROUND | AI_RANGE_PAUSE);
							self->monsterinfo.run (self);
						}
					}
					else
					{
						self->monsterinfo.aiflags &= ~(AI_STAND_GROUND | AI_RANGE_PAUSE);
						self->monsterinfo.run (self);
					}
				}
			}
			M_ChangeYaw (self);
			ai_checkattack (self, 0);
			if (!enemy_vis && (self->monsterinfo.aiflags & AI_RANGE_PAUSE))
			{
				self->monsterinfo.aiflags &= ~(AI_STAND_GROUND | AI_RANGE_PAUSE);
				self->monsterinfo.run (self);
			}
		}
		else
			FindTarget (self);
		return;
	}

	if (FindTarget (self))
		return;
	
	if (level.time > self->monsterinfo.pausetime)
	{
		// Lazarus: Solve problem of monsters pausing at path_corners, taking off in 
		//          original direction
		if(self->enemy && self->enemy->inuse)
			VectorSubtract (self->enemy->s.origin, self->s.origin, v);
		else if(self->goalentity)
			VectorSubtract (self->goalentity->s.origin, self->s.origin, v);
		else {
			self->monsterinfo.pausetime = level.time + random() * 15;
			return;
		}
		self->ideal_yaw = vectoyaw (v);

		// Lazarus: Let misc_actors who are following their leader RUN even when not mad
		if ( (self->monsterinfo.aiflags & AI_FOLLOW_LEADER) && (self->movetarget) &&
			(self->movetarget->inuse) )
		{
			float	R;
			R = realrange(self,self->movetarget);
			if (R > ACTOR_FOLLOW_RUN_RANGE)
				self->monsterinfo.run (self);
			else if(R > ACTOR_FOLLOW_STAND_RANGE || !self->movetarget->client)
				self->monsterinfo.walk (self);
		}
		else
			self->monsterinfo.walk (self);
		return;
	}

	if (!(self->spawnflags & SF_MONSTER_SIGHT) && (self->monsterinfo.idle) && (level.time > self->monsterinfo.idle_time))
	{
		if (self->monsterinfo.aiflags & AI_MEDIC)
			abortHeal(self,false);

		if (self->monsterinfo.idle_time)
		{
			self->monsterinfo.idle (self);
			self->monsterinfo.idle_time = level.time + 15 + random() * 15;
		}
		else
		{
			self->monsterinfo.idle_time = level.time + random() * 15;
		}
	}
}


void ai_walk (edict_t *self, float dist)
{
	// Lazarus: If we're following the leader and have no enemy, run to him
	if ((!self->enemy) && (self->monsterinfo.aiflags & AI_FOLLOW_LEADER))
		self->movetarget = self->goalentity = self->monsterinfo.leader;

	M_MoveToGoal (self, dist);

	// check for noticing a player
	if (FindTarget (self))
		return;

	if ((self->monsterinfo.search) && (level.time > self->monsterinfo.idle_time))
	{
		if (self->monsterinfo.aiflags & AI_MEDIC)
			abortHeal(self,false);

		if (self->monsterinfo.idle_time)
		{
			self->monsterinfo.search (self);
			self->monsterinfo.idle_time = level.time + 15 + random() * 15;
		}
		else
		{
			self->monsterinfo.idle_time = level.time + random() * 15;
		}
	}
}


/*
=============
ai_charge

Turns towards target and advances
Use this call with a distnace of 0 to replace ai_face
==============
*/
void ai_charge (edict_t *self, float dist)
{
	vec3_t	v;

	// Lazarus: Check for existence and validity of enemy.
	// This is normally not necessary, but target_anger making 
	// monster mad at a static object (a pickup, for example)
	// previously resulted in weirdness here
	if(!self->enemy || !self->enemy->inuse)
		return;

	VectorSubtract (self->enemy->s.origin, self->s.origin, v);
	self->ideal_yaw = vectoyaw(v);
	M_ChangeYaw (self);
	if (dist)
		M_walkmove (self, self->s.angles[YAW], dist);
}


/*
=============
ai_turn

don't move, but turn towards ideal_yaw
Distance is for slight position adjustments needed by the animations
=============
*/
void ai_turn (edict_t *self, float dist)
{
	if (dist)
		M_walkmove (self, self->s.angles[YAW], dist);

	if (FindTarget (self))
		return;
	
	M_ChangeYaw (self);
}



/*

.enemy
Will be world if not currently angry at anyone.

.movetarget
The next path spot to walk toward.  If .enemy, ignore .movetarget.
When an enemy is killed, the monster will try to return to it's path.

.hunt_time
Set to time + something when the player is in sight, but movement straight for
him is blocked.  This causes the monster to use wall following code for
movement direction instead of sighting on the player.

.ideal_yaw
A yaw angle of the intended direction, which will be turned towards at up
to 45 deg / state.  If the enemy is in view and hunt_time is not active,
this will be the exact line towards the enemy.

.pausetime
A monster will leave it's stand state and head towards it's .movetarget when
time > .pausetime.

walkmove(angle, speed) primitive is all or nothing
*/

/*
=============
range

returns the range catagorization of an entity reletive to self
0	melee range, will become hostile even if back is turned
1	visibility and infront, or visibility and show hostile
2	infront and show hostile
3	only triggered by damage
=============
*/
int range (edict_t *self, edict_t *other)
{
	vec3_t	v;
	float	len;

	VectorSubtract (self->s.origin, other->s.origin, v);
	len = VectorLength (v);
	if (len < MELEE_DISTANCE)
		return RANGE_MELEE;
	if (len < 500)
		return RANGE_NEAR;
	if (len < self->monsterinfo.max_range)
		return RANGE_MID;
	return RANGE_FAR;
}

/*
=============
visible

returns 1 if the entity is visible to self, even if not infront ()
=============
*/
qboolean visible (edict_t *self, edict_t *other)
{
	vec3_t	spot1;
	vec3_t	spot2;
	trace_t	trace;

	if (!self || !other) // Knightmare- crash protect
		return false;

	VectorCopy (self->s.origin, spot1);
	spot1[2] += self->viewheight;
	VectorCopy (other->s.origin, spot2);
	spot2[2] += other->viewheight;
	trace = gi.trace (spot1, vec3_origin, vec3_origin, spot2, self, MASK_OPAQUE);

	// Lazarus: Take fog into account for monsters

	if ( (trace.fraction == 1.0) || (trace.ent == other))
	{
		if ( (level.active_fog) && (self->svflags & SVF_MONSTER) )
		{
			fog_t	*pfog;
			float	r;
			float	dw;
			vec3_t	v;

			pfog = &level.current_fog;
			VectorSubtract(spot2,spot1,v);
			r = VectorLength(v);
			switch (pfog->Model)
			{
			case 1:
				dw = pfog->Density/10000. * r;
				self->monsterinfo.visibility = exp( -dw );
				break;
			case 2:
				dw = pfog->Density/10000. * r;
				self->monsterinfo.visibility = exp( -dw*dw );
				break;
			default:
				if ( (r < pfog->Near) || (pfog->Near == pfog->Far) )
					self->monsterinfo.visibility = 1.0;
				else if (r > pfog->Far)
					self->monsterinfo.visibility = 0.0;
				else
					self->monsterinfo.visibility = 1.0 - (r - pfog->Near)/(pfog->Far - pfog->Near);
				break;
			}
//			if (developer->value)
//				gi.dprintf("r=%g, vis=%g\n",r,self->monsterinfo.visibility);
			if (self->monsterinfo.visibility < 0.05)
				return false;
			else
				return true;
		}
		else
		{
			self->monsterinfo.visibility = 1.0;
			return true;
		}
	}
	return false;
}


/*
=============
infront

returns 1 if the entity is in front (in sight) of self
=============
*/
qboolean infront (edict_t *self, edict_t *other)
{
	vec3_t	vec;
	float	dot;
	vec3_t	forward;
	
	if (!self || !other) // Knightmare- crash protect
		return false;

	AngleVectors (self->s.angles, forward, NULL, NULL);
	VectorSubtract (other->s.origin, self->s.origin, vec);
	VectorNormalize (vec);
	dot = DotProduct (vec, forward);
	
	if (dot > 0.3)
		return true;
	return false;
}

/*
=============
canReach

similar to visible, but uses a different mask
=============
*/
qboolean canReach (edict_t *self, edict_t *other)
{
	vec3_t	spot1;
	vec3_t	spot2;
	trace_t	trace;

	VectorCopy (self->s.origin, spot1);
	spot1[2] += self->viewheight;
	VectorCopy (other->s.origin, spot2);
	spot2[2] += other->viewheight;
	trace = gi.trace (spot1, vec3_origin, vec3_origin, spot2, self, MASK_SHOT|MASK_WATER);
	
	if (trace.fraction == 1.0 || trace.ent == other)
		return true;
	return false;
}

//============================================================================

void HuntTarget (edict_t *self)
{
	vec3_t	vec;

	// Lazarus: avert impending disaster
	if (self->monsterinfo.aiflags & AI_DUCKED)
		return;

	self->goalentity = self->enemy;
	if (self->monsterinfo.aiflags & AI_STAND_GROUND)
		self->monsterinfo.stand (self);
	else
		self->monsterinfo.run (self);
	VectorSubtract (self->enemy->s.origin, self->s.origin, vec);
	self->ideal_yaw = vectoyaw(vec);
	// wait a while before first attack
	if (!(self->monsterinfo.aiflags & AI_STAND_GROUND))
		AttackFinished (self, 1);
}

void FoundTarget (edict_t *self)
{
	edict_t	*goodguy;
	vec3_t	v;
//	trace_t	tr;

	// Lazarus: avert impending disaster
	if (self->monsterinfo.aiflags & AI_DUCKED)
		return;

	if (self->monsterinfo.aiflags & AI_CHICKEN)
		return;


	// let other monsters see this monster for a while, but not if 
	// it's simply a reflection
	if (self->enemy->client && !(self->enemy->flags & FL_REFLECT))
	{
		self->enemy->flags &= ~FL_DISGUISED;

		level.sight_entity = self;
		level.sight_entity_framenum = level.framenum;
		level.sight_entity->light_level = 128;

		goodguy = NULL;
		goodguy = G_Find(NULL,FOFS(dmgteam),"player");
		while(goodguy)
		{
			if(goodguy->health > 0)
			{
				if(!goodguy->enemy)
				{
					if(goodguy->monsterinfo.aiflags & AI_ACTOR)
					{
						// Can he see enemy?
//						tr = gi.trace(goodguy->s.origin,vec3_origin,vec3_origin,self->enemy->s.origin,goodguy,MASK_OPAQUE);
//						if(tr.fraction == 1.0)
						if(gi.inPVS(goodguy->s.origin,self->enemy->s.origin))
						{
							goodguy->monsterinfo.aiflags |= AI_FOLLOW_LEADER;
							goodguy->monsterinfo.old_leader = NULL;
							goodguy->monsterinfo.leader = self->enemy;
						}
					}
				}
			}
			goodguy = G_Find(goodguy,FOFS(dmgteam),"player");
		}
	}

	self->show_hostile = level.time + 1;		// wake up other monsters
	VectorCopy(self->enemy->s.origin, self->monsterinfo.last_sighting);
	self->monsterinfo.trail_time = level.time;

	if (!self->combattarget)
	{
		HuntTarget (self);
		return;
	}

	self->goalentity = self->movetarget = G_PickTarget(self->combattarget);
	if (!self->movetarget)
	{
		self->goalentity = self->movetarget = self->enemy;
		HuntTarget (self);
		gi.dprintf("%s at %s, combattarget %s not found\n", self->classname, vtos(self->s.origin), self->combattarget);
		return;
	}
	// Lazarus: Huh? How come yaw for combattarget isn't set?
	VectorSubtract(self->movetarget->s.origin,self->s.origin,v);
	self->ideal_yaw = vectoyaw(v);

	// clear out our combattarget, these are a one shot deal
	self->combattarget = NULL;
	self->monsterinfo.aiflags |= AI_COMBAT_POINT;

	// clear the targetname, that point is ours!
	// Lazarus: Why, why, why???? This doesn't remove the point_combat, only makes it inaccessible
	// to other monsters. 
	//self->movetarget->targetname = NULL;
	self->monsterinfo.pausetime = 0;

	// run for it
	self->monsterinfo.run (self);
}


/*
===========
FindTarget

Self is currently not attacking anything, so try to find a target

Returns TRUE if an enemy was sighted

When a player fires a missile, the point of impact becomes a fakeplayer so
that monsters that see the impact will respond as if they had seen the
player.

To avoid spending too much time, only a single client (or fakeclient) is
checked each frame.  This means multi player games will have slightly
slower noticing monsters.
============
*/
qboolean FindTarget (edict_t *self)
{
	edict_t		*client=NULL;
	qboolean	heardit;
	edict_t		*reflection;
	edict_t		*self_reflection;
	int			r;

	if (self->monsterinfo.aiflags & (AI_CHASE_THING | AI_HINT_TEST))
		return false;

	if (self->monsterinfo.aiflags & AI_GOOD_GUY)
	{
		if (self->goalentity && self->goalentity->inuse && self->goalentity->classname)
		{
			if (strcmp(self->goalentity->classname, "target_actor") == 0)
				return false;
		}

		// Lazarus: Look for monsters
		if( !self->enemy )
		{
			if (self->monsterinfo.aiflags & AI_FOLLOW_LEADER)
			{
				int		i;
				edict_t	*e;
				edict_t	*best=NULL;
				vec_t	dist, best_dist;

				best_dist = self->monsterinfo.max_range;
				for(i=game.maxclients+1; i<globals.num_edicts; i++)
				{
					e = &g_edicts[i];
					if(!e->inuse)
						continue;
					if(!(e->svflags & SVF_MONSTER))
						continue;
					if(e->svflags & SVF_NOCLIENT)
						continue;
					if(e->solid == SOLID_NOT)
						continue;
					if(e->monsterinfo.aiflags & AI_GOOD_GUY)
						continue;
					if(!visible(self,e))
						continue;
					if (self->monsterinfo.aiflags & AI_BRUTAL)
					{
						if (e->health <= e->gib_health)
							continue;
					}
					else if (e->health <= 0)
						continue;
					dist = realrange(self,e);
					if(dist < best_dist)
					{
						best_dist = dist;
						best = e;
					}
				}
				if(best)
				{
					self->enemy = best;
					FoundTarget(self);
					return true;
				}
			}
			return false;
		}
		else if (level.time < self->monsterinfo.pausetime )
			return false;
		else
		{
			if (!visible (self, self->enemy))
				return false;
			else
			{
				FoundTarget(self);
				return true;
			}
		}
	}

	// if we're going to a combat point, just proceed
	if (self->monsterinfo.aiflags & AI_COMBAT_POINT)
		return false;

// if the first spawnflag bit is set, the monster will only wake up on
// really seeing the player, not another monster getting angry or hearing
// something

// revised behavior so they will wake up if they "see" a player make a noise
// but not weapon impact/explosion noises

	heardit = false;
	if ((level.sight_entity_framenum >= (level.framenum - 1)) && !(self->spawnflags & SF_MONSTER_SIGHT) )
	{
		client = level.sight_entity;
		if (client->enemy == self->enemy)
		{
			return false;
		}
	}
	else if (level.disguise_violation_framenum > level.framenum)
	{
		client = level.disguise_violator;
	}
	else if (level.sound_entity_framenum >= (level.framenum - 1))
	{
		client = level.sound_entity;
		heardit = true;
	}
	else if (!(self->enemy) && (level.sound2_entity_framenum >= (level.framenum - 1)) && !(self->spawnflags & SF_MONSTER_SIGHT) )
	{
		client = level.sound2_entity;
		heardit = true;
	}
	else
	{
		client = level.sight_client;
		if (!client)
			return false;	// no clients to get mad at
	}

	// if the entity went away, forget it
	if (!client || !client->inuse)
		return false;

	// Lazarus
	if(client->client && client->client->camplayer)
		client = client->client->camplayer;

	if (client == self->enemy)
		return true;	// JDC false;

	// Lazarus: Force idle medics to look for dead monsters
	if (!self->enemy && !Q_stricmp(self->classname,"monster_medic"))
	{
		if (medic_FindDeadMonster(self))
			return true;
	}

	// in coop mode, ignore sounds if we're following a hint_path
	if ((coop && coop->value) && (self->monsterinfo.aiflags & AI_HINT_PATH))
		heardit = false;

	if (client->client)
	{
		if (client->flags & FL_NOTARGET)
			return false;
	}
	else if (client->svflags & SVF_MONSTER)
	{
		if (!client->enemy)
			return false;
		if (client->enemy->flags & FL_NOTARGET)
			return false;
	}
	else if (heardit)
	{
		if (client->owner && (client->owner->flags & FL_NOTARGET))
			return false;
	}
	else
		return false;

	reflection = NULL;
	self_reflection = NULL;
	if (level.num_reflectors)
	{
		int		i;
		edict_t *ref;

		for(i=0; i<6 && !reflection; i++)
		{
			ref = client->reflection[i];
			if(ref && visible(self,ref) && infront(self,ref))
			{
				reflection = ref;
				self_reflection = self->reflection[i];
			}
		}
	}

	if (!heardit)
	{
		r = range (self, client);

		if (r == RANGE_FAR)
			return false;

// this is where we would check invisibility

		// is client in an spot too dark to be seen?
		if (client->light_level <= 5) 
			return false;

		if (!visible (self, client))
		{
			vec3_t	temp;

			if (!reflection)
				return false;

			self->goalentity = self->movetarget = reflection;
			VectorSubtract(reflection->s.origin,self->s.origin,temp);
			self->ideal_yaw = vectoyaw(temp);
			M_ChangeYaw (self);
			// If MORON (=4) is set, then the reflection becomes the
			// enemy. Otherwise if DUMMY (=8) is set, reflection
			// becomes the enemy ONLY if the monster cannot see his
			// own reflection in the same mirror. And if neither situation
			// applies, then reflection is treated identically 
			// to a player noise.
			// Don't do the MORON/DUMMY bit if SF_MONSTER_KNOWS_MIRRORS
			// is set (set automatically for melee-only monsters, and
			// turned on once other monsters have figured out the truth)
			if (!(self->spawnflags & SF_MONSTER_KNOWS_MIRRORS))
			{
				if (reflection->activator->spawnflags & 4)
				{
					self->monsterinfo.attack_state = 0;
					self->enemy = reflection;
					goto got_one;
				}
				if (reflection->activator->spawnflags & 8)
				{
					if (!self_reflection || !visible(self,self_reflection))
					{
						self->monsterinfo.attack_state = 0;
						self->enemy = reflection;
						goto got_one;
					}
				}
			}
			self->monsterinfo.pausetime = 0;
			self->monsterinfo.aiflags &= ~AI_STAND_GROUND;
			self->monsterinfo.run(self);
			return false;
		}

		// Knightmare- commented this out because it causes a crash
		/*if (reflection && !(self->spawnflags & SF_MONSTER_KNOWS_MIRRORS) &&
			!infront(self,client))
		{
			// Client is visible but behind monster.
			// If MORON or DUMMY for the parent func_reflect is set,
			// attack the reflection (in the case of DUMMY, only
			// if monster doesn't see himself in the same mirror)
			if( (reflection->activator->spawnflags & 4) ||
				( (reflection->activator->spawnflags & 8) &&
				(!self_reflection || !visible(self,self_reflection)) ) ) // crashes here
			{
				vec3_t	temp;
				
				self->goalentity = self->movetarget = reflection;
				VectorSubtract(reflection->s.origin,self->s.origin,temp);
				self->ideal_yaw = vectoyaw(temp);
				M_ChangeYaw (self);
				self->enemy = reflection;
				goto got_one;
			}
		}*/

		if (!reflection)
		{
			if (r == RANGE_NEAR)
			{
				if (client->show_hostile < level.time && !infront (self, client))
					return false;
			}
			else if (r == RANGE_MID)
			{
				if (!infront (self, client))
					return false;
			}
		}

		self->enemy = client;

		if (strcmp(self->enemy->classname, "player_noise") != 0)
		{
			self->monsterinfo.aiflags &= ~AI_SOUND_TARGET;

			if (!self->enemy->client)
			{
				self->enemy = self->enemy->enemy;
				if (!self->enemy->client)
				{
					self->enemy = NULL;
					return false;
				}
			}
		}
	}
	else	// heardit
	{
		vec3_t	temp;

		if (self->spawnflags & SF_MONSTER_SIGHT)
		{
			if (!visible (self, client))
				return false;
		}
		else if (!(client->flags & FL_REFLECT))
		{
			// Knightmare- exclude turret drivers from this check
			if ( !gi.inPHS(self->s.origin, client->s.origin) && strcmp(self->classname, "turret_driver") )
				return false;
		}

		VectorSubtract (client->s.origin, self->s.origin, temp);

		if (VectorLength(temp) > 1000)	// too far to hear
		{
			return false;
		}

		// check area portals - if they are different and not connected then we can't hear it
		if (!(client->flags & FL_REFLECT))
		{
			if (client->areanum != self->areanum)
				if (!gi.AreasConnected(self->areanum, client->areanum))
					return false;
		}

		self->ideal_yaw = vectoyaw(temp);
		M_ChangeYaw (self);

		// hunt the sound for a bit; hopefully find the real player
		self->monsterinfo.aiflags |= AI_SOUND_TARGET;
		self->enemy = client;
	}

got_one:

//
// got one
//
	// stop following hint_paths if we've found our enemy
	if (self->monsterinfo.aiflags & AI_HINT_PATH)
		hintpath_stop (self); // hintpath_stop calls foundtarget
	else if (self->monsterinfo.aiflags & AI_MEDIC_PATROL)
		medic_StopPatrolling (self);
	else
		FoundTarget (self);

	if (!(self->monsterinfo.aiflags & AI_SOUND_TARGET) && (self->monsterinfo.sight))
		self->monsterinfo.sight (self, self->enemy);

	return true;
}


//=============================================================================

/*
============
FacingIdeal

============
*/
qboolean FacingIdeal(edict_t *self)
{
	float	delta;

	delta = anglemod(self->s.angles[YAW] - self->ideal_yaw);
	if (delta > 45 && delta < 315)
		return false;
	return true;
}


//=============================================================================

qboolean M_CheckAttack (edict_t *self)
{
	vec3_t	spot1, spot2;
	float	chance;
	trace_t	tr;

	// Lazarus: Paranoia check
	if (!self->enemy)
		return false;

	if (self->enemy->health > 0)
	{
	// see if any entities are in the way of the shot
		VectorCopy (self->s.origin, spot1);
		spot1[2] += self->viewheight;
		VectorCopy (self->enemy->s.origin, spot2);
		spot2[2] += self->enemy->viewheight;
		tr = gi.trace (spot1, NULL, NULL, spot2, self, CONTENTS_SOLID|CONTENTS_MONSTER|CONTENTS_SLIME|CONTENTS_LAVA|CONTENTS_WINDOW);

		// do we have a clear shot?
		if (tr.ent != self->enemy)
		{
			if (!(self->enemy->flags & FL_REFLECT))
				return false;
			if (tr.ent != world)
				return false;
		}
	}
	
	// melee attack
	if (enemy_range == RANGE_MELEE)
	{
		// don't always melee in easy mode
		if ( (skill->value == 0) && (rand()&3) )
			return false;
		if (self->monsterinfo.melee)
			self->monsterinfo.attack_state = AS_MELEE;
		else
			self->monsterinfo.attack_state = AS_MISSILE;
		return true;
	}
	
// missile attack
	if (!self->monsterinfo.attack)
		return false;
		
	if (level.time < self->monsterinfo.attack_finished)
		return false;
		
	if (enemy_range == RANGE_FAR)
		return false;

	// Knightmare- Shouldn't this be self->enemy->flags & FL_REFLECT?
//	if (self->enemy->flags == FL_REFLECT)
	if (self->enemy->flags & FL_REFLECT)
	{
		// no waiting for reflections - shoot 'em NOW
		chance = 2.0;
	}
	else if (self->monsterinfo.aiflags & AI_STAND_GROUND)
	{
		chance = 0.4;
	}
	else if (enemy_range == RANGE_MELEE)
	{
		chance = 0.2;
	}
	else if (enemy_range == RANGE_NEAR)
	{
		chance = 0.1;
	}
	else if (enemy_range == RANGE_MID)
	{
		chance = 0.02;
	}
	else
	{
		return false;
	}

	if (skill->value == 0)
		chance *= 0.5;
	else if (skill->value >= 2)
		chance *= 2;

	if (random () < chance)
	{
		self->monsterinfo.attack_state = AS_MISSILE;
		self->monsterinfo.attack_finished = level.time + 2*random();
		return true;
	}

	if (self->flags & FL_FLY)
	{
		if (random() < 0.3)
			self->monsterinfo.attack_state = AS_SLIDING;
		else
			self->monsterinfo.attack_state = AS_STRAIGHT;
	}

	return false;
}


/*
=============
ai_run_melee

Turn and close until within an angle to launch a melee attack
=============
*/
void ai_run_melee(edict_t *self)
{
	self->ideal_yaw = enemy_yaw;
	M_ChangeYaw (self);

	if (FacingIdeal(self))
	{
		if (self->monsterinfo.melee)
			self->monsterinfo.melee (self);
		self->monsterinfo.attack_state = AS_STRAIGHT;
	}
}


/*
=============
ai_run_missile

Turn in place until within an angle to launch a missile attack
=============
*/
void ai_run_missile(edict_t *self)
{
	self->ideal_yaw = enemy_yaw;
	M_ChangeYaw (self);

	if (FacingIdeal(self))
	{
		if (self->monsterinfo.attack)
			self->monsterinfo.attack (self);
		self->monsterinfo.attack_state = AS_STRAIGHT;
	}
};


/*
=============
ai_run_slide

Strafe sideways, but stay at aproximately the same range
=============
*/
void ai_run_slide(edict_t *self, float distance)
{
	float	ofs;
	
	self->ideal_yaw = enemy_yaw;
	M_ChangeYaw (self);

	if (self->monsterinfo.lefty)
		ofs = 90;
	else
		ofs = -90;
	
	if (M_walkmove (self, self->ideal_yaw + ofs, distance))
		return;
		
	self->monsterinfo.lefty = 1 - self->monsterinfo.lefty;
	M_walkmove (self, self->ideal_yaw - ofs, distance);
}


/*
=============
ai_checkattack

Decides if we're going to attack or do something else
used by ai_run and ai_stand
=============
*/
qboolean ai_checkattack (edict_t *self, float dist)
{
	vec3_t		temp;
	qboolean	hesDeadJim;

//	if (!self || !self-enemy)	// Knightmare- check those pointers!
	if (!self)	// Knightmare- check those pointers!
		return false;

	// this causes monsters to run blindly to the combat point w/o firing
	if (self->goalentity)
	{
		if (self->monsterinfo.aiflags & AI_COMBAT_POINT)
			return false;

		// Caedes fix for monsters ignoring player
	//	if (self->monsterinfo.aiflags & AI_SOUND_TARGET)
		if ( !visible(self, self->goalentity) && (self->monsterinfo.aiflags & AI_SOUND_TARGET) )
		{
			if (self->enemy && (level.time - self->enemy->teleport_time) > 5.0)	//mxd. Added self->enemy check
			{
				if (self->goalentity == self->enemy)
					if (self->movetarget)
						self->goalentity = self->movetarget;
					else
						self->goalentity = NULL;
				self->monsterinfo.aiflags &= ~AI_SOUND_TARGET;
				if (self->monsterinfo.aiflags & AI_TEMP_STAND_GROUND)
					self->monsterinfo.aiflags &= ~(AI_STAND_GROUND | AI_TEMP_STAND_GROUND);
			}
			else
			{
				self->show_hostile = level.time + 1;
				return false;
			}
		}
	}

	enemy_vis = false;

// see if the enemy is dead
	hesDeadJim = false;
	if ((!self->enemy) || (!self->enemy->inuse))
	{
		hesDeadJim = true;
	}
	else if (self->monsterinfo.aiflags & AI_MEDIC)
	{
		if (self->enemy->health > 0)
		{
			hesDeadJim = true;
			self->monsterinfo.aiflags &= ~AI_MEDIC;
		}
	}
	else if (self->enemy->flags & FL_REFLECT)
	{
		hesDeadJim = false;
	}
	else
	{
		if (self->monsterinfo.aiflags & AI_BRUTAL)
		{
			// Lazarus: This value should be enemy class-dependent
			//if (self->enemy->health <= -80)
			if (self->enemy->health <= self->enemy->gib_health)
				hesDeadJim = true;
		}
		else
		{
			if (self->enemy->health <= 0)
				hesDeadJim = true;
		}
	}

	if (hesDeadJim)
	{
		self->enemy = NULL;
	// FIXME: look all around for other targets
		if (self->oldenemy && self->oldenemy->health > 0)
		{
			self->enemy = self->oldenemy;
			self->oldenemy = NULL;
			HuntTarget (self);
		}
		else
		{
			if (self->movetarget)
			{
				self->goalentity = self->movetarget;

				// Lazarus: Let misc_actors who are following their leader RUN even when not mad
				if( (self->monsterinfo.aiflags & AI_FOLLOW_LEADER) &&
					(self->movetarget) &&
					(self->movetarget->inuse) )
				{
					float	R;

					R = realrange(self,self->movetarget); 
					if(R > ACTOR_FOLLOW_RUN_RANGE)
						self->monsterinfo.run (self);
					else if(R > ACTOR_FOLLOW_STAND_RANGE || !self->movetarget->client)
						self->monsterinfo.walk (self);
					else {
						self->monsterinfo.pausetime = level.time + 0.5;
						self->monsterinfo.stand (self);
					}
				}
				else
					self->monsterinfo.walk (self);
			}
			else
			{
				// we need the pausetime otherwise the stand code
				// will just revert to walking with no target and
				// the monsters will wonder around aimlessly trying
				// to hunt the world entity
				self->monsterinfo.pausetime = level.time + 100000000;
				self->monsterinfo.stand (self);
			}
			return true;
		}
	}

	self->show_hostile = level.time + 1;		// wake up other monsters

// check knowledge of enemy

	enemy_vis = visible(self, self->enemy);

	if (enemy_vis)
	{
		self->monsterinfo.search_time = level.time + 5;
		VectorCopy (self->enemy->s.origin, self->monsterinfo.last_sighting);
	}

// look for other coop players here
//	if (coop->value && self->monsterinfo.search_time < level.time)
//	{
//		if (FindTarget (self))
//			return true;
//	}

	if (self->monsterinfo.aiflags & AI_CHICKEN)
	{
		if (enemy_vis)
		{
			if (ai_chicken(self,self->enemy))
				return false;
			else
			{
				self->monsterinfo.aiflags &= ~(AI_CHICKEN | AI_STAND_GROUND);
				self->monsterinfo.pausetime = 0;
				FoundTarget(self);
			}
		}
		else
			return false;
	}

	enemy_infront = infront(self, self->enemy);
	enemy_range = range(self, self->enemy);
	VectorSubtract (self->enemy->s.origin, self->s.origin, temp);
	enemy_yaw = vectoyaw(temp);


	// JDC self->ideal_yaw = enemy_yaw;

	if (self->monsterinfo.attack_state == AS_MISSILE)
	{
		ai_run_missile (self);
		return true;
	}
	if (self->monsterinfo.attack_state == AS_MELEE)
	{
		ai_run_melee (self);
		return true;
	}

	// if enemy is not currently visible, we will never attack
	if (!enemy_vis)
		return false;

	if( self->monsterinfo.checkattack (self) )
	{
		self->enemy->last_attacked_framenum = level.framenum;
		return true;
	}
	else
		return false;
}


#define HINT_PATH_START_TIME 3
#define HINT_PATH_RESTART_TIME 5

/*
=============
ai_run

The monster has an enemy it is trying to kill
=============
*/
void ai_run (edict_t *self, float dist)
{
	vec3_t		v;
	edict_t		*tempgoal;
	edict_t		*save;
	qboolean	new;
	edict_t		*marker;
	float		d1, d2;
	trace_t		tr;
	vec3_t		v_forward, v_right;
	float		left, center, right;
	vec3_t		left_target, right_target;
	qboolean	alreadyMoved = false;
	qboolean	pounce = false;
	edict_t		*realFeind;

	// if we're going to a combat point, just proceed
	if ( self->monsterinfo.aiflags & (AI_COMBAT_POINT | AI_CHASE_THING | AI_HINT_TEST))
	{
		M_MoveToGoal (self, dist);
		return;
	}

	if ( self->monsterinfo.aiflags & AI_MEDIC_PATROL )
	{
		if (!FindTarget(self))
		{
			M_MoveToGoal(self,dist);
			return;
		}
	}


	// If currently mad at a reflection, AND we've already shot at it once, set
	// flag indicating that this monster got suddenly smarter about mirrors, and
	// turn him on the real enemy
	if (self->enemy && (self->enemy->flags & FL_REFLECT))
	{
		if ( (self->enemy->last_attacked_framenum > 0) &&
			(self->enemy->last_attacked_framenum < level.framenum-5) )
		{
			self->enemy->last_attacked_framenum = 0;
			self->spawnflags |= SF_MONSTER_KNOWS_MIRRORS;
			self->enemy = self->enemy->owner;
			self->movetarget = self->goalentity = self->enemy;
			VectorSubtract(self->enemy->s.origin,self->s.origin,v);
			self->ideal_yaw = vectoyaw(v);
			if (!alreadyMoved)
				M_MoveToGoal(self,dist);
			return;
		}
	}

	// Lazarus: If running at a reflection, go ahead, until source of reflection
	// is visible
	if (!self->enemy && self->movetarget && (self->movetarget->flags & FL_REFLECT))
	{
		if (!visible(self,self->movetarget->owner))
		{
			M_MoveToGoal(self,dist);
			return;
		}
	}

	// Lazarus: If we're following the leader and have no enemy, go ahead
	if ((!self->enemy) && (self->monsterinfo.aiflags & AI_FOLLOW_LEADER))
	{
		self->movetarget = self->goalentity = self->monsterinfo.leader;
		if(!self->movetarget)
		{
			self->monsterinfo.pausetime = level.time + 2;
			self->monsterinfo.stand(self);
			return;
		}
		self->monsterinfo.aiflags &= ~(AI_STAND_GROUND | AI_TEMP_STAND_GROUND);
		self->monsterinfo.pausetime = 0;
		M_MoveToGoal (self, dist);
		return;
	}

	// if monster is looking for a trail
	if (self->monsterinfo.aiflags & AI_HINT_PATH)
	{
		M_MoveToGoal (self, dist); // finden Sie der n<>he weg
		if (!self->inuse) return;
		// foremost, look for thine enemy, not his echoes
		if (self->enemy && self->enemy->inuse
			&& strcmp(self->enemy->classname, "player_noise") )
			realFeind = self->enemy;
		else if (self->enemy && self->enemy->inuse && self->enemy->owner)
			realFeind = self->enemy->owner;
		else { // no enemy or enemy went away or don't know thy enemy
			self->enemy = NULL;
			hintpath_stop (self);
			return;
		}

		if (coop && coop->value) {
			// if enemy is visible, ATTACK!
			if (self->enemy && visible(self, realFeind)) pounce = true;
			else FindTarget(self); //else let FindTarget handle it
		} else {
			// Lazarus: special case for medics with AI_MEDIC and AI_HINT_PATH set. If
			//          range is farther than MEDIC_MAX_HEAL_DISTANCE we essentially
			//          lie... pretend the enemy isn't seen.
			if ( self->monsterinfo.aiflags & AI_MEDIC )
			{
				if(realrange(self,realFeind) > MEDIC_MAX_HEAL_DISTANCE)
				{
					// Since we're on a hint_path trying to get in position to 
					// heal monster, rather than actually healing him,
					// allow more time
					self->timestamp = level.time + MEDIC_TRY_TIME;
					return;
				}
			}
			// if enemy is visible, ATTACK!
			if(self->enemy && visible(self, realFeind)) pounce = true;
		}
		// if we attack, stop following trail
		if (pounce) hintpath_stop (self);
		return;
	}

	if (self->monsterinfo.aiflags & AI_SOUND_TARGET)
	{
		if (self->enemy)
			VectorSubtract (self->s.origin, self->enemy->s.origin, v);

		if ((!self->enemy) || (VectorLength(v) < 64))
		{
			self->monsterinfo.aiflags |= (AI_STAND_GROUND | AI_TEMP_STAND_GROUND);
			self->monsterinfo.stand (self);
			return;
		}

		M_MoveToGoal (self, dist);
		alreadyMoved = true; // this prevents double moves
		if(!self->inuse)
			return;

		if (!FindTarget (self))
			return;
	}

	if(ai_checkattack (self, dist))
		return;

	if (self->monsterinfo.attack_state == AS_SLIDING)
	{
		ai_run_slide (self, dist);
		return;
	}

	if ((self->enemy) && (self->enemy->inuse) && (enemy_vis))
	{
	//	if (self.aiflags & AI_LOST_SIGHT)
	//		dprint("regained sight\n");
		if(!alreadyMoved)
			M_MoveToGoal (self, dist);
		if(!self->inuse)
			return;
		self->monsterinfo.aiflags &= ~AI_LOST_SIGHT;
		VectorCopy (self->enemy->s.origin, self->monsterinfo.last_sighting);
		self->monsterinfo.trail_time = level.time;
		return;
	}

	// If monster has been hunting player for > 3 secs without avail,
	// and for the last 5 secs hasn't bothered to update the trail...
	if ( !((self->monsterinfo.trail_time + HINT_PATH_START_TIME) > level.time)
		&& !((self->monsterinfo.last_hint_time + HINT_PATH_RESTART_TIME) > level.time) )
	{	// ...then go find a path, you foo!
		self->monsterinfo.last_hint_time = level.time;
		if (hintcheck_monsterlost(self)) return;
	}

	// coop will change to another enemy if visible
	if (coop->value)
	{	// FIXME: insane guys get mad with this, which causes crashes!
		if (FindTarget (self))
			return;
	}

	// Lazarus: for medics, IF hint_paths are present then cut back a bit on max
	//          search time and let him go idle so he'll start tracking hint_paths
	if (self->monsterinfo.search_time)
	{
		if (!Q_stricmp(self->classname,"monster_medic") && hint_chains_exist)
		{
			if(developer->value)
				gi.dprintf("medic search_time=%g\n",level.time - self->monsterinfo.search_time);

			if (level.time > (self->monsterinfo.search_time + 15))
			{
				if(developer->value)
					gi.dprintf("medic search timeout, going idle\n");

				if(!alreadyMoved)
					M_MoveToGoal (self, dist);
				self->monsterinfo.search_time = 0;
				if(self->goalentity == self->enemy)
					self->goalentity = NULL;
				if(self->movetarget == self->enemy)
					self->movetarget = NULL;
				self->enemy = self->oldenemy = NULL;
				self->monsterinfo.pausetime = level.time + 2;
				self->monsterinfo.stand(self);
				return;
			}
		}
		else if (level.time > (self->monsterinfo.search_time + 20))
		{
			if(!alreadyMoved)
				M_MoveToGoal (self, dist);
			self->monsterinfo.search_time = 0;
			return;
		}
	}

	save = self->goalentity;
	tempgoal = G_Spawn();
	self->goalentity = tempgoal;

	new = false;

	if (!(self->monsterinfo.aiflags & AI_LOST_SIGHT))
	{
		// just lost sight of the player, decide where to go first
//		dprint("lost sight of player, last seen at "); dprint(vtos(self.last_sighting)); dprint("\n");
		self->monsterinfo.aiflags |= (AI_LOST_SIGHT | AI_PURSUIT_LAST_SEEN);
		self->monsterinfo.aiflags &= ~(AI_PURSUE_NEXT | AI_PURSUE_TEMP);
		new = true;
	}

	if (self->monsterinfo.aiflags & AI_PURSUE_NEXT)
	{
		self->monsterinfo.aiflags &= ~AI_PURSUE_NEXT;
//		dprint("reached current goal: "); dprint(vtos(self.origin)); dprint(" "); dprint(vtos(self.last_sighting)); dprint(" "); dprint(ftos(vlen(self.origin - self.last_sighting))); dprint("\n");

		// give ourself more time since we got this far
		self->monsterinfo.search_time = level.time + 5;

		if (self->monsterinfo.aiflags & AI_PURSUE_TEMP)
		{
//			dprint("was temp goal; retrying original\n");
			self->monsterinfo.aiflags &= ~AI_PURSUE_TEMP;
			marker = NULL;
			VectorCopy (self->monsterinfo.saved_goal, self->monsterinfo.last_sighting);
			new = true;
		}
		else if (self->monsterinfo.aiflags & AI_PURSUIT_LAST_SEEN)
		{
			self->monsterinfo.aiflags &= ~AI_PURSUIT_LAST_SEEN;
			marker = PlayerTrail_PickFirst (self);
		}
		else
		{
			marker = PlayerTrail_PickNext (self);
		}

		if (marker)
		{
			VectorCopy (marker->s.origin, self->monsterinfo.last_sighting);
			self->monsterinfo.trail_time = marker->timestamp;
			self->s.angles[YAW] = self->ideal_yaw = marker->s.angles[YAW];
//			dprint("heading is "); dprint(ftos(self.ideal_yaw)); dprint("\n");

//			debug_drawline(self.origin, self.last_sighting, 52);
			new = true;
		}
	}

	VectorSubtract (self->s.origin, self->monsterinfo.last_sighting, v);
	d1 = VectorLength(v);
	if (d1 <= dist)
	{
		self->monsterinfo.aiflags |= AI_PURSUE_NEXT;
		dist = d1;
	}

	VectorCopy (self->monsterinfo.last_sighting, self->goalentity->s.origin);

	if (new)
	{
		tr = gi.trace(self->s.origin, self->mins, self->maxs, self->monsterinfo.last_sighting, self, MASK_PLAYERSOLID);
		if (tr.fraction < 1)
		{
			VectorSubtract (self->goalentity->s.origin, self->s.origin, v);
			d1 = VectorLength(v);
			center = tr.fraction;
			d2 = d1 * ((center+1)/2);
			self->s.angles[YAW] = self->ideal_yaw = vectoyaw(v);
			AngleVectors(self->s.angles, v_forward, v_right, NULL);

			VectorSet(v, d2, -16, 0);
			G_ProjectSource (self->s.origin, v, v_forward, v_right, left_target);
			tr = gi.trace(self->s.origin, self->mins, self->maxs, left_target, self, MASK_PLAYERSOLID);
			left = tr.fraction;

			VectorSet(v, d2, 16, 0);
			G_ProjectSource (self->s.origin, v, v_forward, v_right, right_target);
			tr = gi.trace(self->s.origin, self->mins, self->maxs, right_target, self, MASK_PLAYERSOLID);
			right = tr.fraction;

			center = (d1*center)/d2;
			if (left >= center && left > right)
			{
				if (left < 1)
				{
					VectorSet(v, d2 * left * 0.5, -16, 0);
					G_ProjectSource (self->s.origin, v, v_forward, v_right, left_target);
				}
				VectorCopy (self->monsterinfo.last_sighting, self->monsterinfo.saved_goal);
				self->monsterinfo.aiflags |= AI_PURSUE_TEMP;
				VectorCopy (left_target, self->goalentity->s.origin);
				VectorCopy (left_target, self->monsterinfo.last_sighting);
				VectorSubtract (self->goalentity->s.origin, self->s.origin, v);
				self->s.angles[YAW] = self->ideal_yaw = vectoyaw(v);
			}
			else if (right >= center && right > left)
			{
				if (right < 1)
				{
					VectorSet(v, d2 * right * 0.5, 16, 0);
					G_ProjectSource (self->s.origin, v, v_forward, v_right, right_target);
				}
				VectorCopy (self->monsterinfo.last_sighting, self->monsterinfo.saved_goal);
				self->monsterinfo.aiflags |= AI_PURSUE_TEMP;
				VectorCopy (right_target, self->goalentity->s.origin);
				VectorCopy (right_target, self->monsterinfo.last_sighting);
				VectorSubtract (self->goalentity->s.origin, self->s.origin, v);
				self->s.angles[YAW] = self->ideal_yaw = vectoyaw(v);
			}
		}
	}

	M_MoveToGoal (self, dist);
	if(!self->inuse)
		return;

	G_FreeEdict(tempgoal);

	if (self)
		self->goalentity = save;
}

static int chase_angle[] = {270,450,225,495,540};
qboolean ai_chicken (edict_t *self, edict_t *badguy)
{
	int		i;
	edict_t	*thing;
	vec3_t	atk, dir, best_dir, end, forward;
	vec_t	travel, yaw;
	vec3_t	mins, maxs;
	vec3_t	testpos;
	vec_t	best_dist=0;
	trace_t	trace1, trace2;

	// No point in hiding from attacker if he's gone
	if (!badguy || !badguy->inuse)
		return false;

	if (!self || !self->inuse || (self->health <= 0))
		return false;

	if (!actorchicken->value)
		return false;

	// If we've already been here, quit
	if (self->monsterinfo.aiflags & AI_CHICKEN)
	{
		if (self->movetarget && !Q_stricmp(self->movetarget->classname,"thing"))
			return true;
	}

	VectorCopy(self->mins,mins);
	mins[2] += 18;
	if (mins[2] > 0) mins[2] = 0;
	VectorCopy(self->maxs,maxs);

	// Find a vector that will hide the actor from his enemy
	VectorCopy(badguy->s.origin,atk);
	atk[2] += badguy->viewheight;
	VectorClear(best_dir);
	AngleVectors(self->s.angles,forward,NULL,NULL);
	dir[2] = 0;
	for (travel=512; travel>63 && best_dist == 0; travel /= 2)
	{
		for (i=0; i<5 && best_dist == 0; i++)
		{
			yaw = self->s.angles[YAW] + chase_angle[i];
			yaw = (int)(yaw/45)*45;
			yaw = anglemod(yaw);
			yaw *= M_PI/180;
			dir[0] = cos(yaw);
			dir[1] = sin(yaw);
			VectorMA(self->s.origin,travel,dir,end);
			trace1 = gi.trace(self->s.origin,mins,maxs,end,self,MASK_MONSTERSOLID);
			// Test whether proposed position can be seen by badguy. Test
			// isn't foolproof - tests against 1) new origin, 2) new origin + maxs,
			// 3) new origin + mins, and 4) new origin + min x,y, max z.
			trace2 = gi.trace(trace1.endpos,NULL,NULL,atk,self,MASK_SOLID);
			if (trace2.fraction == 1.0) continue;

			VectorAdd(trace1.endpos,self->maxs,testpos);
			trace2 = gi.trace(testpos,NULL,NULL,atk,self,MASK_SOLID);
			if (trace2.fraction == 1.0) continue;

			VectorAdd(trace1.endpos,self->mins,testpos);
			trace2 = gi.trace(testpos,NULL,NULL,atk,self,MASK_SOLID);
			if (trace2.fraction == 1.0) continue;

			testpos[2] = trace1.endpos[2] + self->maxs[2];
			trace2 = gi.trace(testpos,NULL,NULL,atk,self,MASK_SOLID);
			if(trace2.fraction == 1.0) continue;

			best_dist = trace1.fraction * travel;
			if (best_dist < 32) // not much point to this move
				continue;
			VectorCopy(dir,best_dir);
		}
	}
	return false;

	if (best_dist < 32)
		return false;

	// This snaps the angles, which may not be all that good but it sure
	// is quicker than turning in place
	vectoangles(best_dir,self->s.angles);
	thing = SpawnThing();
	VectorMA(self->s.origin,best_dist,best_dir,thing->s.origin);
	thing->touch_debounce_time = level.time + 3.0;
	thing->target_ent = self;
	ED_CallSpawn(thing);
	self->movetarget = self->goalentity = thing;
	self->monsterinfo.aiflags &= ~(AI_SOUND_TARGET | AI_STAND_GROUND | AI_TEMP_STAND_GROUND);
	self->monsterinfo.pausetime = 0;
	self->monsterinfo.aiflags |= (AI_CHASE_THING | AI_CHICKEN);
	gi.linkentity(self);
	self->monsterinfo.run(self);
	self->monsterinfo.chicken_framenum = level.framenum;
	return true;
}