Idle in Finite State Machine

Unity Engine
1

Hi, I’m trying to make a simple finite state machine for my ai and I’m having a problem to make idle state. What I want for my idle state is if my state machine is in idle, it will wait for random range from 3-5 seconds then go to another state, but the wait can be interrupt when the something trigger. I have no Idea how to make script that wait for certain number of seconds. So here is what I have so far for my state machine.

using UnityEngine;
using System.Collections;

public class AI : MonoBehaviour
{
    public enum State
    {
        Idle,
        Wander,
        Moving,
        Follow,
        Attack
    }

    SphereCollider sphere;
    NavMeshAgent agent;

    float walkRadius;
    State _state;

    void Awake()
    {
        sphere = GetComponent<SphereCollider> ();
        agent = GetComponent<NavMeshAgent> ();

        walkRadius = sphere.radius;

        _state = State.Idle;
        StartCoroutine ("FSM");
    }
   

    IEnumerator FSM()
    {
        while(true)
        {
            switch(_state)
            {
            case State.Idle:
                Idle();
                break;

            case State.Wander:
                Wander();
                break;

            case State.Moving:
                Moving();
                break;

            case State.Follow:
                break;

            case State.Attack:
                break;
            }
            yield return null;
        }
    }

    void Idle()
    {
        Debug.Log ("Idle");
        _state = State.Wander;
    }

    void Wander()
    {
        Vector3 randomDirection = Random.insideUnitSphere * walkRadius;
        randomDirection += transform.position;

        NavMeshHit hit;
        NavMesh.SamplePosition(randomDirection, out hit, walkRadius, 1);
        agent.SetDestination(hit.position);

        _state = State.Moving;
        Debug.Log ("Moving");
    }

    void Moving()
    {
        if (agent.remainingDistance <= agent.stoppingDistance)
        {
            Debug.Log("Done moving, going to idle");
            _state = State.Idle;
        }
    }


}
2
3

thanks, I came up with this and add a randomness to my ai but it seems the wait never works.

void Idle()
    {
        Debug.Log ("Idle");
        StartCoroutine ("Waiting");
    }

    IEnumerator Waiting()
    {
        float wanderOrIdle = Random.Range (0, 100);
   
        if (wanderOrIdle >= 50)
        {
            yield return new WaitForSeconds (3);
            _state = State.Wander;
        }
        else
        {
            _state = State.Wander;
        }

        StopCoroutine ("Waiting");
    }

i make a 50-50 change to either wait or wander, but it always go on wonder even if the random is greater than 50

4

never mind, i solve it. the problem is the state idle is never change, so every frame called, it start a new coroutine and never wait

5

why not use built in state machne and state machine behaviours and transitions?

6

How on earth did I miss this one? Thanks. Off to refractor.

7

i thought this is only for controlling animation, does this work with navmesh?

8

“Basically, anything that requires some kind of StateMachine logic in your game – with or without animation – can use this.”