/// <summary>
/// Calculate the angle we need to turn the AI Entity body towards the target
/// </summary>
/// <returns>A positive angle in degrees that is needed to face the target.</returns>
public float DetermineAngleNeededToTurnTowardsTarget()
{
float angle = CalculationUtil.FindSignedAngle(
this.stateMachine.AiEntityBodyTransform.forward,
this.stateMachine.NavAgent.steeringTarget - this.stateMachine.AiEntityBodyTransform.position
);
return(angle);
}
/// <summary>
/// Handles the alerted state by continuing to pursue waypoints, etc.
/// </summary>
/// <returns>Either the alerted state or any new state if certain conditions were met.</returns>
private AiStateType HandleDefaultState()
{
AiStateType state = GetDefaultStateType();
if (
!zombieStateMachine.IsTargetReached &&
(zombieStateMachine.ThreatManager.DoesAudioThreatExist() || zombieStateMachine.ThreatManager.DoesLightThreatExist())
)
{
// we got close to the target due to light or sound, so now we need to know if we should pursue it or seek to find it
float angle = CalculationUtil.FindSignedAngle(
zombieStateMachine.AiEntityBodyTransform.forward,
zombieStateMachine.ThreatManager.CurrentTarget.Position - zombieStateMachine.AiEntityBodyTransform.position
);
if (zombieStateMachine.ThreatManager.DoesAudioThreatExist() && Mathf.Abs(angle) < this.threatAngleThreshold)
{
// it's a sound and we are capable of heading to it, so pursue it
state = AiStateType.Pursuit;
}
else if (HasReachedMaxDirectionChangeTime())
{
// it's not a sound and we are not capable of turning towards it, so determine which way we should turn
if (Random.value < zombieStateMachine.Intelligence)
{
SeekTowards(angle); // smartly turn
}
else
{
SeekRandomly(); // randomly turn because we are a stupid zombie :)
}
ResetDirectionChangeTimer(); // TODO: this does sometimes happen often and it makes the zombie appear as if it is stuck in the alerted state
}
}
else if (
zombieStateMachine.ThreatManager.IsTargeting(AiTargetType.Waypoint) &&
!zombieStateMachine.NavAgent.pathPending
)
{
// we were targeting a waypoint and we arrived at it, so determine if we can head to next one or turn towards it
float angle = zombieStateMachine.ThreatManager.DetermineAngleNeededToTurnTowardsTarget();
if (Mathf.Abs(angle) < this.turnOnSpotThreshold)
{
state = AiStateType.Patrol;
}
else if (HasReachedMaxDirectionChangeTime())
{
SeekTowards(angle);
ResetDirectionChangeTimer();
}
}
else if (HasReachedMaxDirectionChangeTime())
{
// we didn't find what we were looking for and our clock ran out, so turn randomly and repeat the entire alert process
// TODO: this does sometimes happen often and it makes the zombie appear as if it is stuck in the alerted state
SeekRandomly();
ResetDirectionChangeTimer();
}
return(state);
}