private void Patrol()
{
// === Patrol ===
if (patrolEnabled == true)
{
// It returns the next transform only when the object has reached its current target.
Transform next = patrolPath.CheckAndHandleTargetReached(patrolThresholdDistance);
if (next != null)
{
navMeshAgent.SetDestination(next.position);
}
}
// === Find Hostile ===
Actor target = FindNearestVisibleHostile();
if (target != null)
{
lockedTarget = target;
StartTransitionTo(State.ATTACK);
}
else
{
// === Find Suspecious Point ===
AttractionSource source = FindNearestAttraction();
if (source != null)
{
Debug.Log(source);
TargetLostAtPosition(source.transform.position);
StartTransitionTo(State.ATTACK);
}
}
}
void Awake()
{
lineRenderer = CommonUtil.GetComponentFromSelfOrChildren <LineRenderer>(this);
// Make attraction. AI use this to check attraction point.
attractionSource = gameObject.AddComponent <AttractionSource>();
AttractionSourceManager.Register(attractionSource);
bodyToAimRelative = weaponAimPoint.position - transform.position;
}
// ==== Life span ====
protected override void Awake()
{
base.Awake();
motor = GetComponent <PlayerMotor>();
CommonUtil.IfNullLogError <PlayerMotor>(motor);
weaponManager = GetComponent <PlayerWeaponManager>();
CommonUtil.IfNullLogError <PlayerWeaponManager>(weaponManager);
attractionSource = gameObject.AddComponent <AttractionSource>();
AttractionSourceManager.Register(attractionSource);
ikController = GetComponentInChildren <AvatarIKController>();
}
private AttractionSource FindNearestAttraction()
{
AttractionSource tgt = null;
float distance, actualNoiseVolume;
float cmp = float.MaxValue;
// Traverse each actor to get its [AttractionSource]
foreach (AttractionSource src in AttractionSourceManager.attractionSources)
{
// Find loudest noise source position.
if (src != null)
{
distance = Vector3.Distance(src.transform.position, transform.position);
actualNoiseVolume = CommonUtil.CalcNoiseAfterDecay(src.currentAttraction, distance);
if (actualNoiseVolume > noiseDetectThreshold && actualNoiseVolume < cmp)
{
cmp = actualNoiseVolume;
tgt = src;
}
}
}
return(tgt);
}
// @Warning: lossy design!
private void Attack()
{
// === Target insight ===
if (isTargetLost == false)
{
// Do possible retarget
/*
* Actor target = FindNearestVisibleHostile();
* if(target != null) {
* lockedTarget = target;
* }
*/
// Face towards target
navMeshAgent.updateRotation = false;
OrientTowardsTarget(lockedTarget);
if (!IsVisible(lockedTarget))
{
// Target already lost
Debug.Log("Lost");
TargetLostAtPosition(lockedTarget.transform.position);
}
else
{
// Target not lost
// Already in attack angle.
if (angleToTarget < attackAngle)
{
if (distanceToTarget < minAttackRange)
{
// Too close, move back.
navMeshAgent.isStopped = false;
navMeshAgent.SetDestination(transform.position + -transform.forward * stepBackAmount);
}
else if (distanceToTarget > maxAttackRange)
{
// Too far, move close. Walk backward without automatic rotation.
navMeshAgent.isStopped = false;
navMeshAgent.SetDestination(lockedTarget.transform.position);
}
else
{
// Start to attack
navMeshAgent.isStopped = true;
shootTransform.rotation = Quaternion.LookRotation(lockedTarget.transform.position - transform.position);
// Randomize shooting to make AI stupid and inaccurate.
if (Random.Range(0f, 1f) < shootingAccuracy)
{
weaponData.TryShoot(shootTransform);
}
else
{
// Inaccurate fire, has a big possibility to miss.
float yBiasAngle = Random.Range(-biasAngle, biasAngle);
float zBiasAngle = Random.Range(-biasAngle, biasAngle);
Quaternion originalRotation = shootTransform.rotation;
shootTransform.rotation = Quaternion.Euler(0, yBiasAngle, zBiasAngle) * shootTransform.rotation;
weaponData.TryShoot(shootTransform);
shootTransform.rotation = originalRotation;
}
}
}
}
}
else
{
// === Target lost ===
lockedTarget = null;
navMeshAgent.updateRotation = true;
navMeshAgent.isStopped = false;
// Do target find
// Target might change.
Actor target = FindNearestVisibleHostile();
if (target != null)
{
lockedTarget = target;
isTargetLost = false;
}
else
{
// No visible target. Find some evidence
AttractionSource source = FindNearestAttraction();
if (source != null)
{
// Detected noise
Debug.Log(source);
TargetLostAtPosition(source.transform.position);
}
else
{
// Go to target
if (Vector3.Distance(transform.position, lastKnownPosition) > targetReachThreshold)
{
navMeshAgent.SetDestination(lastKnownPosition);
}
else
{
// Already reached destination, but still no evidence.
if (Time.time - lastTargetLostTime > maxTargetLostTime)
{
StartTransitionTo(State.PATROL);
navMeshAgent.SetDestination(patrolPath.GetNextTransform().position);
}
else
{
// Do random orientation
if (lastThinkTime + 2f < Time.time)
{
lastThinkTime = Time.time;
randomQuaternion = Quaternion.Euler(0, Random.Range(90, 180) * (Random.Range(0, 2) == 0?-1:1), 0) * transform.rotation;
}
else
{
OrientTowardsQuaternion(randomQuaternion);
}
}
}
}
}
}
// Debug
Debug.DrawLine(transform.position, lastKnownPosition, Color.blue);
}
public static void Register(AttractionSource src)
{
attractionSources.Add(src);
}
public static void Unregister(AttractionSource src)
{
attractionSources.Remove(src);
}
