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Question by ppapa2000 · Apr 07, 2017 at 02:56 PM · c#scripting problempathpathfollowing

Getting an error even if the script works.

It's a pathfinding script. Even when the object completes it's path and goes back to the original point, I still get an error "Array index out of range" in line 39. (targetWayPoint = wayPointList[currentWayPoint];)

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

 public class PathFollow : MonoBehaviour {

 public Transform[] wayPointList;
 public int currentWayPoint = 0;
 Transform targetWayPoint;
 public float speed = 4f;

 void Start()
 {

 }

 void Update()
 {
     if (currentWayPoint < this.wayPointList.Length)
     {
         if (targetWayPoint == null)
             targetWayPoint = wayPointList[currentWayPoint];
         Walk();
     }
     else if (currentWayPoint > wayPointList.Length - 1) {
         currentWayPoint = 0;
         targetWayPoint = wayPointList[currentWayPoint];
         Walk();
     }
 }

 void Walk()
 {
     transform.forward = Vector3.RotateTowards(transform.forward, targetWayPoint.position - transform.position, speed * Time.deltaTime, 0.0f);
     transform.position = Vector3.MoveTowards(transform.position, targetWayPoint.position, speed * Time.deltaTime);
     if (transform.position == targetWayPoint.position)
     {
         currentWayPoint++;
         targetWayPoint = wayPointList[currentWayPoint];   //I'm getting the error here.
     }
 }

}

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Answer by MD_Reptile · Apr 07, 2017 at 02:58 PM

Then that "currentWayPoint" variable you use as the index, is going beyond the maximum length of the "wayPointList" array. Remember that arrays start at 0, not 1 (the index anyway), so you have to consider that while you code.

One simple way to handle it might be to check if currentWayPoint is higher than wayPointList.Length - 1 before doing anything using the wayPointList array.

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