Array out of range (673248)

Unity Engine
1

Hi everyone, I did a script. Basically, it must allow AI(enemy) to follow a path through waypoint system but when I start the game, I have the error, Array out of range. I know what this mean but I don’t know how to resolve it. If someone can help me :wink:

using System.Collections; 
using System.Collections.Generic; 
using UnityEngine;

public class EiMovement : MonoBehaviour {

public static Transform[] wayPoints;
private Transform target;
public float speed;
private int wayPointIndex;


// Use this for initialization
void Awake () {
     wayPoints = new Transform[transform.childCount];
     for (int i = 0; i < wayPoints.Length; i++) {
         wayPoints[i] = transform.GetChild (i);
     }
}
void Start(){
     target = wayPoints[0];
}


// Update is called once per frame
void Update () {
     Vector3 dir = target.position - transform.position;
     transform.Translate (dir.normalized * speed * Time.deltaTime);
     if (Vector3.Distance(transform.position, target.position) <= 0.2f){
         goNextWayPoint ();
     }
}
         void goNextWayPoint(){
     if (wayPointIndex == wayPoints.Length -1) {
         Destroy (gameObject);
         return;
     }
        
     wayPointIndex++;
     target = wayPoints[wayPointIndex];
}
    
}
2

What line is the error on? That would tell us which array it’s having trouble with. :slight_smile:

3

AH! Line error :
IndexOutOfRangeException: Array index is out of range.
EiMovement.Start () (at Assets/Scene2/EiMovement.cs:27)
;(

4

If I delete the line 27 ( target = wayPoint[0]; ), the enemy can go to the first waypoint but after he stops

5

up

6

New one :
My new error xD line 44 aray index out of range

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EiMovement : MonoBehaviour {

    public static Transform[] wayPoints;
    public Transform target;



    public float speed;
    private int wayPointIndex = 0;

    // Use this for initialization
    void Awake () {

        wayPoints = new Transform[transform.childCount];
        for (int i = 0; i < wayPoints.Length; i++) {
            wayPoints[i] = transform.GetChild (i);
        }

    }

    void Start(){
        //target = wayPoints[0];
    }




    // Update is called once per frame
    void Update () {
        Vector3 dir = target.position - transform.position;
        transform.Translate (dir.normalized * speed * Time.deltaTime);

        if (Vector3.Distance(transform.position, target.position) <= 0.2f){
            goNextWayPoint ();
        }

    }

            void goNextWayPoint(){
        target = wayPoints[wayPointIndex];
        wayPointIndex++;

        /*if (wayPointIndex == wayPoints.Length - 1) {
            target = wayPoints[wayPointIndex];
            wayPointIndex++;
            //Destroy (gameObject);
            //return;
        }
          
        wayPointIndex++;
        target = wayPoints[wayPointIndex];*/
    }
      
}
7

up

8

All arrays start at 0 and go to the length of their array - 1.

You need to put a check in to see if you are at the end.

if(index < wayPoints.Length)
    index++;
9

I resolved but thanks :slight_smile:

He looks like that :

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class WaypointInisalize : MonoBehaviour {

    public static Transform[] wayPoints;


    // Use this for initialization
    void Start () {


        wayPoints = new Transform[transform.childCount];
        for (int i = 0; i < wayPoints.Length; i++) {
            wayPoints[i] = transform.GetChild (i);
        }
   
    }
   
    // Update is called once per frame
    void Update () {
       
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EiMovement : MonoBehaviour {

    private Transform target;



    public float speed;
    private int wayPointIndex = 0;

    // Use this for initialization
    void Awake () {



    }

    void Start(){
        target = WaypointInisalize.wayPoints[0];
    }




    // Update is called once per frame
    void Update () {
        Vector3 dir = target.position - transform.position;
        transform.Translate (dir.normalized * speed * Time.deltaTime);

        if (Vector3.Distance(transform.position, target.position) <= 0.2f){
            goNextWayPoint ();
        }

    }

            void goNextWayPoint(){
        wayPointIndex++;
        target = WaypointInisalize.wayPoints[wayPointIndex];

        /*if (wayPointIndex == wayPoints.Length - 1) {
            target = wayPoints[wayPointIndex];
            wayPointIndex++;
            //Destroy (gameObject);
            //return;
        }
           
        wayPointIndex++;
        target = wayPoints[wayPointIndex];*/
    }
       
}