/// <summary>
/// React to attacks on other AI.
/// </summary>
public void OnFriendHit(Actor friend)
{
if (friend == null)
{
return;
}
var vector = friend.transform.position - transform.position;
if (vector.magnitude < View.CommunicationDistance)
{
_situation.IsAlerted = true;
}
else if (vector.magnitude < View.SightDistance && !IsAlerted)
{
if (AIUtil.IsInSight(this, friend.TopPosition))
{
_situation.IsAlerted = true;
}
}
if (_situation.IsAlerted && _situation.Threat == null)
{
var ai = friend.GetComponent <AIController>();
if (ai != null)
{
_situation.TakeEnemyState(ai);
}
}
}
private bool shouldRunTo(Vector3 position)
{
var distance = Vector3.Distance(transform.position, position);
if (distance > WalkDistance || (distance > VerifyDistance && !AIUtil.IsInSight(_actor, position, VerifyDistance, 360)))
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Updates the target situation to approach an enemy that's in cover.
/// </summary>
public static void ApproachACovered(AIController controller, ref AISituation situation)
{
var path = new NavMeshPath();
var corners = new Vector3[16];
var resultPosition = situation.ThreatGroundPosition;
var resultDistance = 9999f;
var coverAngle = Util.AngleOfVector(situation.ThreatCoverForward);
for (int a = 0; a < 18; a++)
{
var angle = coverAngle - 180f + a * 10;
var position = situation.ThreatGroundPosition + new Vector3(Mathf.Cos(angle * Mathf.Deg2Rad), 0, Mathf.Sin(angle * Mathf.Deg2Rad)) * controller.Distances.MinEnemy;
NavMeshHit hit;
if (NavMesh.SamplePosition(position, out hit, 1.0f, NavMesh.AllAreas) &&
AIUtil.IsInSight(controller, hit.position, situation.ThreatStandingTopPosition))
{
NavMesh.CalculatePath(controller.transform.position, hit.position, NavMesh.AllAreas, path);
if (path.status == NavMeshPathStatus.PathComplete &&
!AIUtil.IsPositionTooCloseToFriends(controller, hit.position))
{
var dist = 0f;
for (int i = 1; i < path.GetCornersNonAlloc(corners); i++)
{
dist += Vector3.Distance(corners[i - 1], corners[i]);
}
if (dist < resultDistance)
{
resultDistance = dist;
resultPosition = position;
}
}
}
}
situation.TargetPosition = resultPosition;
situation.TargetCover = null;
}
private bool canBeInvestigated(SearchPoint point)
{
var position = point.Position + Vector3.up * VerifyHeight;
var distanceToPoint = Vector3.Distance(transform.position, position);
var checkDistance = VerifyDistance;
if (point.Visibility < checkDistance)
{
checkDistance = point.Visibility;
}
if (distanceToPoint < checkDistance &&
(distanceToPoint < 1 ||
AIUtil.IsInSight(_actor, position, checkDistance, FieldOfView)))
{
return(!point.RequiresReaching || distanceToPoint < 1.1f);
}
return(false);
}
/// <summary>
/// Checks if the given actor is field of view. Result is immediate, does not execute any events or messages.
/// </summary>
public bool CheckVisibility(Actor actor)
{
var viewDistance = actor.GetViewDistance(Distance, _isAlerted);
return(AIUtil.IsInSight(_actor, actor.TopPosition, viewDistance, FieldOfView, ObstacleIgnoreDistance));
}
private void Update()
{
if (_situation.IsAlerted)
{
if (!_hasAddedToAlertedControllers)
{
_hasAddedToAlertedControllers = true;
_alertedControllers.Add(this);
}
}
else if (_hasAddedToAlertedControllers)
{
_alertedControllers.Remove(this);
}
_stateTime += Time.deltaTime;
_agent.updatePosition = false;
_agent.updateRotation = false;
_agent.updateUpAxis = false;
_agent.autoRepath = true;
_agent.autoBraking = false;
if (!_motor.IsAlive)
{
_situation.TargetCover = null;
}
if (_lastTargetCover != _situation.TargetCover)
{
if (_lastTargetCover != null)
{
_lastTargetCover.UnregisterUser(_actor);
}
_lastTargetCover = _situation.TargetCover;
if (_lastTargetCover != null)
{
_lastTargetCover.RegisterUser(_actor);
}
}
if (_isWaitingForPath && !_agent.pathPending)
{
_pathLength = _agent.path.GetCornersNonAlloc(_path);
_currentPathIndex = 0;
_isWaitingForPath = false;
}
if (!_motor.IsAlive)
{
_state = AIState.none;
_agent.enabled = false;
return;
}
else
{
_agent.enabled = true;
}
if (_motor.PotentialCover != null)
{
_motor.InputTakeCover();
}
if (_situation.IsAlerted)
{
if (!_motor.IsInCover)
{
_motor.InputAim();
}
// Make the AI pick up a weapon.
if (Fighting.WeaponToUse <= 0)
{
_motor.InputWeapon(0);
}
else if (Fighting.WeaponToUse - 1 < _motor.Weapons.Length)
{
_motor.InputWeapon(Fighting.WeaponToUse);
}
else
{
_motor.InputWeapon(_motor.Weapons.Length);
}
_situation.IsAllowedToBeAggressive = true;
///
/// POTENTIALLY FORGET ABOUT THE ENEMY. CHECK IF CAN BE AGGRESSIVE.
///
if (_situation.Threat != null)
{
if (_situation.Threat.IsAlive)
{
if (!_situation.CanSeeTheThreat && _situation.NoThreatTimer > View.EnemySustainTime)
{
_situation.RemoveEnemyState();
}
else
{
if (_registeredGroup != null)
{
_registeredGroup.MarkAsPotentialAggressive(this);
_situation.IsAllowedToBeAggressive = _registeredGroup.IsAggressive(this);
}
}
}
else
{
_situation.RemoveEnemyState();
}
}
///
/// AIM AND FIRE
///
if (_situation.Threat != null && (_situation.CanSeeTheThreat || _situation.NoThreatTimer < View.SightSustainTime))
{
// Process grenade throwing
if (_situation.ThrownGrenadeCount < Grenades.GrenadeCount)
{
var doThrow = false;
if (_situation.IsAllowedToBeAggressive)
{
if (_hasThrowFirstGrenade)
{
if (_grenadeTimer < Grenades.Interval)
{
_grenadeTimer += Time.deltaTime;
}
else
{
doThrow = true;
}
}
else
{
if (_grenadeTimer < Grenades.FirstGrenadeDelay)
{
_grenadeTimer += Time.deltaTime;
}
else
{
doThrow = true;
}
}
}
if (doThrow && _motor.PotentialGrenade != null)
{
if (_grenadeCheckTimer <= float.Epsilon)
{
GrenadeDescription desc;
desc.Gravity = _motor.Grenade.Gravity;
desc.Duration = _motor.PotentialGrenade.Timer;
desc.Bounciness = _motor.PotentialGrenade.Bounciness;
var length = GrenadePath.Calculate(GrenadePath.Origin(_motor, Util.AngleOfVector(_situation.ThreatGroundPosition - transform.position)),
_situation.ThreatGroundPosition,
_motor.Grenade.MaxVelocity,
desc,
_grenadePath,
_motor.Grenade.Step);
if (Vector3.Distance(_grenadePath[length - 1], _situation.ThreatGroundPosition) > Grenades.MaxRadius ||
Vector3.Distance(_grenadePath[length - 1], _situation.CurrentPosition) < Grenades.AvoidDistance)
{
_grenadeCheckTimer = Grenades.CheckInterval;
}
else
{
_motor.InputThrowGrenade(_grenadePath, length, _motor.Grenade.Step);
_situation.ThrownGrenadeCount++;
_grenadeTimer = 0;
_hasThrowFirstGrenade = true;
}
}
else
{
_grenadeCheckTimer -= Time.deltaTime;
}
}
else
{
_grenadeCheckTimer = 0;
}
}
// Position in world space that is best fit to aim at.
var perfectTarget = _situation.ThreatGroundPosition + (_situation.ThreatTopPosition - _situation.ThreatGroundPosition) * 0.7f;
if (_situation.IsThreatInCover)
{
var dot = Vector3.Dot(_situation.ThreatCoverForward, (_situation.ThreatGroundPosition - transform.position).normalized);
if (dot < -0.1f)
{
perfectTarget = _situation.ThreatStandingTopPosition;
}
}
// Make the AI look at the target.
{
var vector = perfectTarget - _motor.transform.position;
vector.y = 0;
if (vector.magnitude < 2)
{
_motor.SetLookTarget(perfectTarget + vector * 2);
}
else
{
_motor.SetLookTarget(perfectTarget);
}
_motor.SetBodyLookTarget(perfectTarget);
}
// Aim the gun at the inprecise target.
var targetRadius = Fighting.TargetRadius.Get(Vector3.Distance(_situation.ThreatGroundPosition, transform.position));
_motor.SetFireTarget(perfectTarget + new Vector3(UnityEngine.Random.Range(-1, 1) * targetRadius,
UnityEngine.Random.Range(-1, 1) * targetRadius,
UnityEngine.Random.Range(-1, 1) * targetRadius));
// We want AI too look at the corner when standing near it.
if (_motor.IsInTallCover)
{
if (_situation.TargetDirection < 0)
{
_motor.InputStandLeft();
}
else if (_situation.TargetDirection > 0)
{
_motor.InputStandRight();
}
}
// Fire
{
var isAllowedToFire = _situation.IsAllowedToBeAggressive;
if (Behaviour.OnlyFireWhenSeen || !_situation.IsAllowedToBeAggressive)
{
var up = Camera.main.WorldToViewportPoint(transform.position);
var down = Camera.main.WorldToViewportPoint(transform.position + Vector3.up * 2);
if ((up.x < 0 ||
up.y < 0 ||
up.x > 1 ||
up.y > 1 ||
up.z < 0) &&
(down.x < 0 ||
down.y < 0 ||
down.x > 1 ||
down.y > 1 ||
down.z < 0))
{
isAllowedToFire = false;
}
else
{
isAllowedToFire = true;
}
}
if (isAllowedToFire)
{
var burst = Behaviour.IsFightingUsingCovers ? CoveredFightingBursts : CoveredApproachBursts;
var isDumb = _state == AIState.fireInCover &&
(_stateTime <= burst.IntroDuration || _stateTime >= burst.IntroDuration + burst.Duration);
var isWalking = _state != AIState.takeCover && _state != AIState.approach && _state != AIState.retreat;
// Check if can fire right now.
if (Behaviour.CanFire &&
(!isWalking || _walkingBurstWait < WalkingBursts.Duration) &&
(!_situation.IsTargetCoverGood ||
(_state != AIState.hideInCover &&
(_state != AIState.takeCover || _motor.Cover == null))))
{
var aimPoint = transform.position;
if (_motor.IsInTallCover && _situation.IsTargetCoverGood)
{
if (_situation.TargetDirection < 0)
{
aimPoint = _motor.Cover.LeftCorner(transform.position.y, _motor.CoverSettings.CornerOffset.x);
}
else
{
aimPoint = _motor.Cover.RightCorner(transform.position.y, _motor.CoverSettings.CornerOffset.x);
}
}
// See if the motor can hit the standing enemy after potentially peeking.
if (AIUtil.IsInSight(this, aimPoint, _situation.ThreatStandingTopPosition))
{
if (_state == AIState.fireInCover)
{
_motor.InputAim();
}
if (!isDumb)
{
_motor.InputFire();
}
}
}
}
_lookPointTimer = 0;
}
}
else
{
_motor.SetFireTarget(_situation.ThreatGroundPosition);
_motor.SetLookTarget(_situation.ThreatGroundPosition);
_motor.SetBodyLookTarget(_situation.ThreatGroundPosition);
lookAround(_situation.ThreatGroundPosition - _motor.transform.position);
}
}
else
{
_motor.InputWeapon(0);
if (_state == AIState.patrol || _state == AIState.patrolPause)
{
Vector3 forward;
if (Waypoints.Length > 1)
{
var next = Waypoints[_situation.PatrolPoint];
forward = next.Position - transform.position;
if (forward.magnitude < 0.5f)
{
var previous = _situation.PatrolPoint == 0 ? Waypoints[Waypoints.Length - 1] : Waypoints[_situation.PatrolPoint - 1];
var line = next.Position - previous.Position;
if (Vector2.Dot(line, forward) > 0)
{
forward = line;
}
}
}
else
{
forward = transform.forward;
}
lookAround(forward);
}
else
{
_lookPointTimer = 0;
}
}
var positionToMoveTo = transform.position;
///
/// STATE MANAGEMENT
///
{
var updateSituationInDetail = false;
{
// Update the update delay timer.
_updateTimer -= Time.deltaTime;
if (_updateTimer < 0)
{
_updateTimer = Fighting.ReactionTime;
updateSituationInDetail = true;
}
}
// Update standing burst timer.
{
_walkingBurstWait += Time.deltaTime;
if (_walkingBurstWait > WalkingBursts.Duration + WalkingBursts.Wait)
{
_walkingBurstWait = 0;
}
}
{
_situation.Update(this, _previousSituation, updateSituationInDetail);
if (!isStateStillValid(_state, _stateTime, _situation, _situation))
{
updateSituation(calcState(_situation, _state, _stateTime));
}
}
}
///
/// WALK
///
if (!_motor.IsInCornerAimState)
{
if (_state == AIState.takeCover ||
_state == AIState.approach ||
_state == AIState.investigate ||
_state == AIState.retreat ||
_state == AIState.patrol ||
_state == AIState.avoidGrenade)
{
var toTarget = _situation.TargetPosition - transform.position;
// If patrolling, set the body to rotate towards the target.
if (_state == AIState.patrol)
{
if (toTarget.magnitude > 0.1f)
{
var normalized = toTarget.normalized;
var position = transform.position + normalized * 4;
var dot = Vector3.Dot(toTarget.normalized, _motor.transform.forward);
if (Waypoints[_situation.PatrolPoint].Run)
{
_motor.SetBodyLookTarget(position, 8);
}
else
{
if (dot > 0)
{
_motor.SetBodyLookTarget(position, 1.6f);
}
else if (dot > -0.5f)
{
_motor.SetBodyLookTarget(position, 2.5f);
}
else
{
_motor.SetBodyLookTarget(position, 4f);
}
}
}
}
// Move the last meter without using the agent.
if (toTarget.magnitude > 1.0f)
{
var vectorToAgent = _agent.nextPosition - transform.position;
var distanceToAgent = vectorToAgent.magnitude;
if (distanceToAgent > float.Epsilon)
{
vectorToAgent /= distanceToAgent;
}
// If agent moved too far, reset it.
if (distanceToAgent > 1f)
{
updateAgent(_situation.TargetPosition);
}
float walkSpeed;
if (_state == AIState.patrol && !Patrol.IsAlwaysRunning && (Waypoints.Length == 0 || !Waypoints[_situation.PatrolPoint].Run))
{
walkSpeed = 0.5f;
}
else
{
walkSpeed = 1.0f;
}
var point = _currentPathIndex + 1 < _pathLength ? _path[_currentPathIndex + 1] : _situation.TargetPosition;
var vectorToPoint = point - transform.position;
var distanceToPoint = vectorToPoint.magnitude;
if (distanceToPoint > float.Epsilon)
{
vectorToPoint /= distanceToPoint;
}
if (distanceToPoint < 0.1f && _currentPathIndex + 1 < _pathLength)
{
_currentPathIndex++;
}
_agent.speed = 0.1f;
_motor.InputMovement(new CharacterMovement(vectorToPoint, walkSpeed));
}
else
{
if (_state == AIState.takeCover)
{
_motor.InputImmediateCoverSearch();
_motor.InputTakeCover();
}
if (toTarget.magnitude > 0.05f)
{
_motor.InputMovement(new CharacterMovement(toTarget.normalized, 0.5f));
}
else
{
_motor.transform.position = _situation.TargetPosition;
}
}
}
}
}
/// <summary>
/// Returns an updated situation struct.
/// </summary>
public void Update(AIController controller, AISituation previous, bool updateInDetail)
{
if (!IsAlerted)
{
HasInvestigatedTheLatestAlert = false;
}
else if (Threat == null & Vector3.Distance(CurrentPosition, ThreatGroundPosition) < controller.Distances.ThreatInvestigation)
{
MarkInvestigated();
}
if (HasAnInvestigatedAlert)
{
InvestigatedAlertAge += Time.deltaTime;
}
// Check grenades
{
IsNearGrenade = false;
float minDist = 1000;
foreach (var grenade in GrenadeList.All)
{
var vec = grenade.transform.position - controller.transform.position;
var dist = vec.magnitude;
if (dist < grenade.ExplosionRadius)
{
if (!IsNearGrenade || dist < minDist)
{
minDist = dist;
IsNearGrenade = true;
NearestGrenadePosition = grenade.transform.position;
if (Threat == null)
{
HasInvestigatedTheLatestAlert = false;
HasAnInvestigatedAlert = false;
ThreatGroundPosition = grenade.transform.position;
}
}
}
}
}
// Check friends and enemies.
if (Threat == null || (!IsAlerted && !IsGettingAlerted))
{
var minEnemyInfoTimer = controller.View.EnemySustainTime;
foreach (var actor in Actors.All)
{
if (actor != controller.Actor)
{
if (actor.Side != controller.Actor.Side)
{
if (AIUtil.IsInSight(controller, actor.TopPosition))
{
IsAlerted = true;
ReadEnemyState(actor);
break;
}
}
else if (actor.AI != null && actor.AI.IsAlerted)
{
var vector = actor.transform.position - controller.transform.position;
if (vector.magnitude < controller.View.CommunicationDistance)
{
IsAlerted = true;
if (actor.AI.Situation.NoThreatTimer < actor.AI.View.EnemySustainTime &&
minEnemyInfoTimer > actor.AI.Situation.NoThreatTimer)
{
TakeEnemyState(actor.AI);
}
}
}
}
}
}
// Check friends if they had investigated the same position
if (IsAlerted && Threat == null && !HasInvestigatedTheLatestAlert)
{
foreach (var friend in Actors.All)
{
if (friend != controller.Actor &&
friend.Side == controller.Actor.Side &&
friend.AI.IsAlerted &&
friend.AI.Situation.HasAnInvestigatedAlert &&
friend.AI.Situation.InvestigatedAlertAge < 10 &&
Vector3.Distance(friend.transform.position, controller.transform.position) < controller.View.CommunicationDistance &&
Vector3.Distance(friend.AI.Situation.InvestigatedThreatPosition, ThreatGroundPosition) < controller.Distances.ThreatInvestigation)
{
MarkInvestigated();
break;
}
}
}
// Check threats
if (Threat == null)
{
var minDist = 100000f;
foreach (var alert in Alerts.All)
{
var dist = Vector3.Distance(controller.transform.position, alert.Position);
if (dist < alert.Range)
{
if (dist < minDist)
{
minDist = dist;
IsAlerted = true;
ThreatGroundPosition = alert.Position;
HasAnInvestigatedAlert = false;
HasInvestigatedTheLatestAlert = false;
}
}
}
}
// React to grenades
if (IsNoticingGrenade)
{
if (GrenadeReaction < float.Epsilon)
{
IsNoticingGrenade = false;
}
else
{
GrenadeReaction -= Time.deltaTime;
IsNearGrenade = false;
}
}
else if (IsNearGrenade && !previous.IsNearGrenade)
{
GrenadeReaction = controller.Fighting.GrenadeReactionTime;
IsNoticingGrenade = true;
IsNearGrenade = false;
}
if (IsNearGrenade)
{
IsAlerted = true;
}
// React to being alerted.
if (IsGettingAlerted)
{
if (AlertReaction < float.Epsilon)
{
IsGettingAlerted = false;
IsAlerted = true;
}
else
{
AlertReaction -= Time.deltaTime;
IsAlerted = false;
}
}
else if (IsAlerted && !previous.IsAlerted)
{
AlertReaction = controller.Fighting.ReactionTime;
IsGettingAlerted = true;
IsAlerted = false;
}
if (previous.TargetCover != null &&
(controller.Motor.LeftCover == previous.TargetCover || controller.Motor.RightCover == previous.TargetCover || controller.Motor.Cover == previous.TargetCover))
{
CurrentCover = previous.TargetCover;
}
else
{
CurrentCover = controller.Motor.Cover;
}
CurrentPosition = controller.transform.position;
IsGunReady = controller.Motor.IsGunReady && controller.Motor.Gun.Clip >= controller.Motor.Gun.ClipSize * controller.Fighting.ReloadFraction;
if (controller.Health != null && Threat != null && Threat.IsAttacking)
{
IsRetreating = IsAlerted && controller.Health.Health <= controller.Fighting.MinHealth;
}
else
{
IsRetreating = false;
}
if (IsAlerted)
{
var couldSeeTheEnemy = CanSeeTheThreat;
CanSeeTheThreat = false;
if (Threat != null)
{
if (couldSeeTheEnemy || updateInDetail)
{
CanSeeTheThreat = AIUtil.IsInSight(controller, Threat.TopPosition);
}
if (CanSeeTheThreat)
{
ReadEnemyState(Threat);
}
else
{
NoThreatTimer += Time.deltaTime;
if (updateInDetail)
{
// Check friends and enemies.
foreach (var friend in Actors.All)
{
if (friend != controller.Actor &&
friend.Side == controller.Actor.Side &&
friend.AI != null &&
friend.AI.IsAlerted &&
friend.AI.Situation.CanSeeTheThreat &&
friend.AI.Situation.Threat == Threat)
{
var vector = friend.transform.position - controller.transform.position;
if (vector.magnitude < controller.View.CommunicationDistance)
{
TakeEnemyState(friend.AI);
}
}
}
}
}
}
if (TargetCover != null && updateInDetail)
{
var distanceToThreat = Vector3.Distance(TargetPosition, ThreatGroundPosition);
IsTargetCoverGood = distanceToThreat >= controller.Distances.MinEnemy &&
distanceToThreat >= controller.Cover.MinCoverToEnemyDistance &&
AIUtil.IsGoodAngle(controller,
TargetCover,
TargetPosition,
ThreatGroundPosition,
TargetCover.IsTall(controller.Motor.CoverSettings.TallThreshold)) &&
!AIUtil.IsCoverPositionTooCloseToFriends(TargetCover, controller, TargetPosition);
}
if (updateInDetail)
{
if (TargetCover != null && TargetCover.IsTall(controller.Motor.CoverSettings.TallThreshold))
{
Vector3 aimPoint;
if (TargetDirection < 0)
{
aimPoint = TargetCover.LeftCorner(0, controller.Motor.CoverSettings.CornerOffset.x);
}
else
{
aimPoint = TargetCover.RightCorner(0, controller.Motor.CoverSettings.CornerOffset.x);
}
CanSeeFromTargetPosition = AIUtil.IsInSight(controller, aimPoint, ThreatStandingTopPosition);
}
else
{
CanSeeFromTargetPosition = AIUtil.IsInSight(controller, TargetPosition, ThreatStandingTopPosition);
}
}
}
else
{
if (TargetCover != null && updateInDetail)
{
IsTargetCoverGood = !AIUtil.IsCoverPositionTooCloseToFriends(TargetCover, controller, TargetPosition);
}
CanSeeFromTargetPosition = true;
}
}
/// <summary>
/// Updates the target situation to approach an enemy that's not in cover.
/// </summary>
public static void ApproachAFree(AIController controller, ref AISituation situation, NavMeshAgent agent, float maxDistance, bool approachStanding)
{
situation.TargetCover = null;
situation.TargetPosition = situation.ThreatGroundPosition;
var path = new NavMeshPath();
agent.CalculatePath(situation.ThreatGroundPosition, path);
var corners = new Vector3[16];
var count = path.GetCornersNonAlloc(corners);
if (count < 2)
{
return;
}
var i = 0;
var p0 = corners[i];
var p1 = corners[i + 1];
var f = 1f;
var targetPosition = approachStanding ? situation.ThreatStandingTopPosition : situation.ThreatGroundPosition;
{
var distLeft = Vector3.Distance(controller.transform.position, situation.ThreatGroundPosition);
while (distLeft > maxDistance)
{
var pd = Vector3.Distance(p0, p1);
var left = distLeft - maxDistance;
distLeft -= pd;
if (pd >= left)
{
f = left / pd;
break;
}
else
{
i++;
if (i + 1 >= count)
{
i = 0;
break;
}
else
{
p0 = corners[i];
p1 = corners[i + 1];
}
}
}
}
while (i + 1 < count)
{
var p = p0 + (p1 - p0) * f;
if (AIUtil.IsInSight(controller, p, targetPosition))
{
situation.TargetPosition = p;
break;
}
f += 0.2f;
if (f >= 1f)
{
if (AIUtil.IsInSight(controller, p1, targetPosition))
{
situation.TargetPosition = p1;
break;
}
f = 0;
i++;
}
}
}
/// <summary>
/// Updates the target situation to take cover. Returns true if a cover was found.
/// </summary>
public static bool TakeCover(AIController controller, ref AISituation situation)
{
var currentVectorToTarget = situation.ThreatGroundPosition - situation.CurrentPosition;
var currentDistanceToTarget = currentVectorToTarget.magnitude;
Cover result = null;
float resultPathDistance = 0;
int resultDirection = 0;
Vector3 resultPosition = situation.CurrentPosition;
var path = new NavMeshPath();
var corners = new Vector3[32];
var isAlreadyTooClose = currentDistanceToTarget <= controller.Distances.MinEnemy || currentDistanceToTarget <= controller.Cover.MinCoverToEnemyDistance;
var covers = new List <CoverItem>();
foreach (var collider in Physics.OverlapSphere(controller.transform.position, controller.Cover.MaxDistance, 0x1 << 8, QueryTriggerInteraction.Collide))
{
if (!collider.isTrigger)
{
continue;
}
var cover = CoverSearch.GetCover(collider.gameObject);
if (cover == null || cover == situation.CurrentCover)
{
continue;
}
var item = new CoverItem();
item.Cover = cover;
item.IsTall = cover.IsTall(controller.Motor.CoverSettings.TallThreshold);
if (item.IsTall)
{
item.Direction = cover.ClosestCornerTo(situation.CurrentPosition, controller.Motor.CoverSettings.CornerAimTriggerDistance, out item.Point);
}
else
{
item.Point = cover.ClosestPointTo(situation.CurrentPosition, controller.Motor.CoverSettings.LowSideEnterRadius, 0.3f);
}
if (float.IsNaN(item.Point.x) || float.IsNaN(item.Point.z))
{
continue;
}
item.Point.y = cover.Bottom;
item.Distance = Vector3.Distance(controller.transform.position, item.Point);
covers.Add(item);
}
foreach (var item in covers.OrderBy(o => o.Distance))
{
var isTall = item.IsTall;
var cover = item.Cover;
var point = item.Point;
var coverDirection = item.Direction;
if (!AIUtil.IsGoodAngle(controller, cover, point, situation.ThreatGroundPosition, isTall))
{
continue;
}
var distanceToTarget = Vector3.Distance(situation.ThreatGroundPosition, point);
if (distanceToTarget < controller.Distances.MinEnemy ||
distanceToTarget < controller.Cover.MinCoverToEnemyDistance)
{
continue;
}
if (situation.CurrentCover != null && Vector3.Distance(situation.CurrentPosition, point) < controller.Cover.MinSwitchDistance)
{
continue;
}
if ((controller.Health == null || controller.Health.Health > controller.Fighting.MinHealth))
{
if (isTall)
{
Vector3 aimPoint;
coverDirection = cover.ClosestCornerTo(point, -controller.Motor.CoverSettings.CornerOffset.x, out aimPoint);
if (!AIUtil.IsInSight(controller, aimPoint, situation.ThreatStandingTopPosition))
{
continue;
}
}
else if (!AIUtil.IsInSight(controller, point, situation.ThreatStandingTopPosition))
{
continue;
}
}
var distanceToOrigin = Vector3.Distance(situation.CurrentPosition, point);
if (situation.CurrentCover == null)
{
if (distanceToOrigin > controller.Cover.MaxDistance)
{
continue;
}
}
else
if (distanceToOrigin > controller.Cover.MaxSwitchDistance)
{
continue;
}
var areThereFriends = false;
{
var hasChangedPosition = false;
Vector3 side;
if (Vector3.Dot((point - situation.CurrentPosition).normalized, cover.Right) > 0)
{
side = cover.Right;
}
else
{
side = cover.Left;
}
do
{
hasChangedPosition = false;
if (AIUtil.IsCoverPositionTooCloseToFriends(cover, controller, point))
{
var next = point + side * 0.5f;
if (cover.IsInFront(next, false))
{
point = next;
hasChangedPosition = true;
}
else
{
areThereFriends = true;
}
}
}while (hasChangedPosition);
}
if (areThereFriends)
{
continue;
}
var isOk = false;
NavMesh.CalculatePath(situation.CurrentPosition, point, NavMesh.AllAreas, path);
float pathDistance = 0f;
var count = path.GetCornersNonAlloc(corners);
if (count < 2)
{
continue;
}
var isTooCloseToEnemy = false;
for (int i = 1; i < count; i++)
{
pathDistance += Vector3.Distance(corners[i - 1], corners[i]);
if (!isAlreadyTooClose)
{
if (Util.DistanceToSegment(situation.ThreatGroundPosition, corners[i - 1], corners[i]) <= controller.Distances.MinPassing)
{
isTooCloseToEnemy = true;
break;
}
}
}
if (isTooCloseToEnemy)
{
continue;
}
if (situation.CurrentCover == null)
{
isOk = result == null || pathDistance < resultPathDistance;
}
else if (controller.Health == null || controller.Health.Health > controller.Fighting.MinHealth)
{
isOk = (isAlreadyTooClose || distanceToTarget < currentDistanceToTarget) &&
(result == null || pathDistance < resultPathDistance);
}
else
{
isOk = distanceToTarget > currentDistanceToTarget && (result == null || pathDistance < resultPathDistance);
}
if (isOk)
{
result = cover;
resultPosition = point;
resultPathDistance = pathDistance;
resultDirection = coverDirection;
break;
}
}
situation.TargetDirection = resultDirection;
if (result == null)
{
if (situation.IsThreatInCover)
{
ApproachACovered(controller, ref situation);
}
else
{
ApproachAFree(controller, ref situation, controller.Agent, controller.Distances.MaxWalkingFight, true);
}
return(false);
}
else
{
situation.IsNewCover = true;
situation.TargetCover = result;
situation.TargetPosition = resultPosition;
return(true);
}
}
private bool verify(Vector3 position)
{
var distance = Vector3.Distance(transform.position, position);
return((_cover != null && AIUtil.IsInSight(_actor, position + Vector3.up * VerifyHeight, _verifyDistance, FieldOfView)) || distance < VerifyRadius || (distance < _verifyDistance && _verifyDistance < VerifyRadius));
}
/// <summary>
/// Returns an updated situation struct.
/// </summary>
public void Update(AIController controller, AISituation previous, bool updateInDetail)
{
if (!IsAlerted)
{
HasInvestigatedTheLatestAlert = false;
}
else if (!HasInvestigatedTheLatestAlert && Vector3.Distance(CurrentPosition, InvestigationPosition) < controller.Distances.ThreatInvestigation)
{
MarkInvestigated();
}
if (HasAnInvestigatedAlert)
{
InvestigatedAlertAge += Time.deltaTime;
}
if (IsIrritated)
{
if (IrritationTime > controller.Fighting.Irritation)
{
IrritationTime = 0;
IsIrritated = false;
}
else
{
IrritationTime += Time.deltaTime;
}
}
else
{
IrritationTime = 0;
}
// Check grenades
{
IsNearGrenade = false;
float minDist = 1000;
foreach (var grenade in GrenadeList.All)
{
var vec = grenade.transform.position - controller.transform.position;
var dist = vec.magnitude;
if (dist < grenade.ExplosionRadius)
{
if (!IsNearGrenade || dist < minDist)
{
minDist = dist;
IsNearGrenade = true;
NearestGrenadePosition = grenade.transform.position;
if (Threat == null)
{
HasInvestigatedTheLatestAlert = false;
HasAnInvestigatedAlert = false;
IsThreatPositionANewAlert = true;
SetThreatPosition(grenade.transform.position, true);
}
}
}
}
}
// Check friends and enemies.
if (Threat == null || (!IsAlerted && !IsGettingAlerted))
{
foreach (var actor in Actors.All)
{
if (actor != controller.Actor)
{
if (actor.Side != controller.Actor.Side)
{
if (AIUtil.IsInSight(controller, actor.TopPosition))
{
IsAlerted = true;
ReadEnemyState(actor);
break;
}
}
else if (actor.AI != null && actor.AI.IsAlerted)
{
var vector = actor.transform.position - controller.transform.position;
if (vector.magnitude < controller.View.CommunicationDistance)
{
IsAlerted = true;
if (actor.AI.State != AIState.investigate)
{
if (actor.AI.Situation.Threat != null && actor.AI.Situation.HasBetterThreatInfo(actor.AI, ref this))
{
TakeEnemyState(actor.AI);
break;
}
}
}
}
}
}
}
// Check friends if they had investigated the same position
if (IsAlerted && !HasInvestigatedTheLatestAlert)
{
foreach (var friend in Actors.All)
{
if (friend != controller.Actor &&
friend.Side == controller.Actor.Side &&
friend.AI != null &&
friend.AI.IsAlerted &&
friend.AI.Situation.HasAnInvestigatedAlert &&
friend.AI.Situation.InvestigatedAlertAge < 4 &&
Vector3.Distance(friend.transform.position, controller.transform.position) < controller.View.CommunicationDistance &&
Vector3.Distance(friend.AI.Situation.InvestigatedThreatPosition, InvestigationPosition) < controller.Distances.ThreatInvestigation)
{
MarkInvestigated();
break;
}
}
}
var isCheckingAThreatInCover = Threat != null && IsThreatInCover && !CanSeeTheThreat;
// Check threats
if (Threat == null || CanSeeThatNoThreatAtLastPosition || isCheckingAThreatInCover)
{
var minDist = 100000f;
foreach (var alert in Alerts.All)
{
bool isOk;
Actor newThreat = null;
if (Threat != null)
{
if (alert.Actor == null)
{
isOk = NoThreatVisibilityTime > 6;
}
else if (alert.Actor.Side != controller.Actor.Side)
{
isOk = true;
newThreat = alert.Actor;
}
else if (alert.Actor.AI != null)
{
isOk = NoThreatVisibilityTime > 2 && alert.Actor.AI.Situation.NoThreatVisibilityTime < 1;
}
else
{
isOk = NoThreatVisibilityTime > 6;
}
}
else
{
isOk = true;
}
if (isOk)
{
var dist = Vector3.Distance(controller.transform.position, alert.Position);
if (dist < alert.Range)
{
if (dist < minDist)
{
minDist = dist;
IsAlerted = true;
HasAnInvestigatedAlert = false;
HasInvestigatedTheLatestAlert = false;
if (newThreat != null)
{
ReadEnemyState(newThreat);
}
else
{
IsThreatPositionANewAlert = true;
SetThreatPosition(alert.Position, true);
}
}
}
}
}
}
// React to grenades
if (IsNoticingGrenade)
{
if (GrenadeReaction < float.Epsilon)
{
IsNoticingGrenade = false;
}
else
{
GrenadeReaction -= Time.deltaTime;
IsNearGrenade = false;
}
}
else if (IsNearGrenade && !previous.IsNearGrenade)
{
GrenadeReaction = controller.Fighting.GrenadeReactionTime;
IsNoticingGrenade = true;
IsNearGrenade = false;
}
if (IsNearGrenade)
{
IsAlerted = true;
}
// React to being alerted.
if (IsGettingAlerted)
{
if (AlertReaction < float.Epsilon)
{
IsGettingAlerted = false;
IsAlerted = true;
}
else
{
AlertReaction -= Time.deltaTime;
IsAlerted = false;
}
}
else if (IsAlerted && !previous.IsAlerted)
{
AlertReaction = controller.Fighting.ReactionTime;
IsGettingAlerted = true;
IsAlerted = false;
}
if (previous.TargetCover != null &&
(controller.Motor.LeftCover == previous.TargetCover || controller.Motor.RightCover == previous.TargetCover || controller.Motor.Cover == previous.TargetCover))
{
CurrentCover = previous.TargetCover;
}
else
{
CurrentCover = controller.Motor.Cover;
}
CurrentPosition = controller.transform.position;
IsGunReady = controller.Motor.IsGunReady && controller.Motor.Gun.Clip >= controller.Motor.Gun.ClipSize * controller.Fighting.ReloadFraction;
if (Threat == null || Threat.IsAggressive)
{
WouldLikeToRetreat = controller.Health.Health <= controller.Fighting.MinHealth;
}
else
{
WouldLikeToRetreat = false;
}
if (IsAlerted)
{
var couldSeeTheEnemy = CanSeeTheThreat;
CanSeeTheThreat = false;
if (Threat != null)
{
var noPatience = NoThreatVisibilityTime > controller.Fighting.Patience;
if (couldSeeTheEnemy || updateInDetail)
{
CanSeeTheThreat = AIUtil.IsInSight(controller, Threat.TopPosition);
}
if (CanSeeTheThreat)
{
ReadEnemyState(Threat);
if (!couldSeeTheEnemy && noPatience)
{
IsIrritated = true;
}
}
else
{
if (noPatience || (NoThreatVisibilityTime > 2 && (!IsThreatInCover || Vector3.Dot(ThreatCoverForward, ThreatGroundPosition - CurrentPosition) > 0)))
{
if (!IsThreatInCover ||
noPatience ||
Vector3.Distance(CurrentPosition, ThreatGroundPosition) < controller.Distances.ThreatInvestigation ||
AIUtil.IsInSight(controller, (ThreatGroundPosition + ThreatTopPosition) * 0.5f))
{
CanSeeThatNoThreatAtLastPosition = true;
}
}
NoThreatVisibilityTime += Time.deltaTime;
if (updateInDetail)
{
// Check friends.
foreach (var friend in Actors.All)
{
if (friend != controller.Actor &&
friend.Side == controller.Actor.Side &&
friend.AI != null &&
friend.AI.IsAlerted &&
friend.AI.State != AIState.investigate &&
friend.AI.Situation.Threat == Threat &&
friend.AI.Situation.HasBetterThreatInfo(friend.AI, ref this))
{
var vector = friend.transform.position - controller.transform.position;
if (vector.magnitude < controller.View.CommunicationDistance)
{
TakeEnemyState(friend.AI);
}
}
}
}
}
}
if (TargetCover != null && updateInDetail)
{
var distanceToThreat = Vector3.Distance(TargetPosition, ThreatGroundPosition);
IsTargetCoverGood = distanceToThreat >= controller.Distances.MinEnemy &&
distanceToThreat >= controller.Cover.MinCoverToEnemyDistance &&
AIUtil.IsGoodAngle(controller,
TargetCover,
TargetPosition,
ThreatGroundPosition,
TargetCover.IsTall) &&
!AIUtil.IsCoverPositionTooCloseToFriends(TargetCover, controller, TargetPosition);
}
if (updateInDetail)
{
if (IsThreatInCover)
{
if (CurrentCover != null && CurrentCover.IsTall)
{
var aimPoint = Vector3.zero;
var isGood = true;
if (TargetDirection < 0)
{
isGood = CurrentCover.IsLeft(Util.AngleOfVector(ThreatStandingTopPosition - CurrentCover.LeftCorner(0)), controller.Motor.CoverSettings.Angles.LeftCorner, false);
if (isGood)
{
aimPoint = CurrentCover.LeftCorner(0, controller.Motor.CoverSettings.CornerOffset.x);
}
}
else
{
isGood = CurrentCover.IsRight(Util.AngleOfVector(ThreatStandingTopPosition - CurrentCover.RightCorner(0)), controller.Motor.CoverSettings.Angles.LeftCorner, false);
if (isGood)
{
aimPoint = CurrentCover.RightCorner(0, controller.Motor.CoverSettings.CornerOffset.x);
}
}
CanSeeFromCurrentPosition = AIUtil.IsInSight(controller, aimPoint, ThreatStandingTopPosition);
}
else
{
CanSeeFromCurrentPosition = AIUtil.IsInSight(controller, CurrentPosition, ThreatStandingTopPosition);
}
}
else
{
CanSeeFromCurrentPosition = CanSeeTheThreat;
}
}
}
else
{
if (TargetCover != null && updateInDetail)
{
IsTargetCoverGood = !AIUtil.IsCoverPositionTooCloseToFriends(TargetCover, controller, TargetPosition);
}
}
}
private void Update()
{
if (!_actor.IsAlive)
{
return;
}
_wait -= Time.deltaTime;
if (_wait > float.Epsilon)
{
return;
}
_wait = Random.Range(UpdateDelay * 0.8f, UpdateDelay * 1.2f);
_oldVisible.Clear();
foreach (var actor in _visible)
{
_oldVisible.Add(actor);
}
_visible.Clear();
foreach (var actor in _oldVisible)
{
if (actor != null && actor.IsAlive && AIUtil.IsInSight(_actor, actor.TopPosition, actor.GetViewDistance(Distance, _isAlerted), FieldOfView))
{
_visible.Add(actor);
}
else
{
Message("OnUnseeActor", actor);
if (!actor.IsAlive)
{
_knownAlive.Remove(actor);
Message("OnSeeDeath", actor);
}
}
}
var count = Physics.OverlapSphereNonAlloc(_actor.TopPosition, Distance, _colliders, 0x1, QueryTriggerInteraction.Ignore);
for (int i = 0; i < count; i++)
{
var actor = Actors.Get(_colliders[i].gameObject);
if (actor != null && actor != _actor && actor.IsAlive && !_oldVisible.Contains(actor))
{
if (AIUtil.IsInSight(_actor, actor.TopPosition, actor.GetViewDistance(Distance, _isAlerted), FieldOfView))
{
_visible.Add(actor);
Message("OnSeeActor", actor);
}
}
}
_oldKnownAlive.Clear();
foreach (var known in _knownAlive)
{
_oldKnownAlive.Add(known);
}
_knownAlive.Clear();
foreach (var actor in _oldKnownAlive)
{
if (_visible.Contains(actor))
{
_knownAlive.Add(actor);
}
else if (AIUtil.IsInSight(_actor, actor.TopPosition, actor.GetViewDistance(Distance, _isAlerted), FieldOfView))
{
Message("OnSeeDeath", actor);
}
else
{
_knownAlive.Add(actor);
}
}
}
