Trying to create a field of view for the enemies

Question

Hi guys, so im trying to create a field of view for the enemies in my game, i was following a tutorial but its not working now and i really don't understand where i've gone wrong.The error is :

IndexOutOfRangeException: Index was outside the bounds of the array. FieldOfViewEnemy.inFOV (UnityEngine.Transform checkingObject, UnityEngine.Transform target, System.Single MaxAngle, System.Single MaxRadius) (at Assets/Scripts/FieldOfViewEnemy.cs:26) FieldOfViewEnemy.Update () (at Assets/Scripts/FieldOfViewEnemy.cs:63)

and the code for it is:

 using System.Collections;
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Security.Cryptography;
 using UnityEngine;



 public class FieldOfViewEnemy : MonoBehaviour
 {

 public Transform player;
 public float MaxAngle;
 public float MaxRadius;

 private bool isInFOV = false;

 public bool inFOV(Transform checkingObject, Transform target, float MaxAngle, float MaxRadius)
 { 

     Collider[] overlaps = new Collider[10];
     int count = Physics.OverlapSphereNonAlloc(checkingObject.position, MaxRadius, overlaps);

     for (int i = 0; i < count + 1; i++)
     {
         if (overlaps[i] != null)
         {


             if (overlaps[i].transform == target)
             {
                 Vector3 directionBetween = (target.position - checkingObject.position).normalized;
                 directionBetween.y *= 0;

                 float angle = Vector3.Angle(checkingObject.forward, directionBetween);

                 if (angle <= MaxAngle)
                 {
                     Ray ray = new Ray(checkingObject.position, target.position - checkingObject.position);
                     RaycastHit hit;

                     if (Physics.Raycast(ray, out hit, MaxRadius))
                     {
                         if (hit.transform == target)
                             Debug.Log("player spotted!");
                             return true;
                    
                         


                     }

                 }
             }
         }
     }
     return false;
 }
  

    void Update()
     {
         isInFOV = inFOV(transform, player, MaxAngle, MaxRadius);
     }
 }

Answer 1

Answer by yusfkoc15 · Sep 27, 2020 at 11:43 AM

Your array range is small. İnstead of ----Collider[] overlaps = new Collider[10];-----

Maybe using list ıt can help you

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Answer 2

Answer by Zaeran · Sep 18, 2020 at 03:00 AM

Most likely it's your for loop.

You're getting the count, which is the number of elements in the overlaps array, but then your for loop goes up to 'count + 1', which is always going to end up with a number that's one higher than the number of elements in your array.

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Gabimela · Sep 18, 2020 at 08:51 AM 0

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i see, so how would i fix this? @Zaeran

Zaeran Gabimela · Sep 18, 2020 at 11:04 AM 0

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start out by making a small change to your for loop:

 for (int i = 0; i < count; i++)

Gabimela Zaeran · Sep 18, 2020 at 11:41 AM 0

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I did do that before and nothing happens now when i play the game @Zaeran

Answer 3

It's a different Way but Maybe it can help you.

Don't use EnemyInSight() in Update. Instead you can use Invoke Repeating.

 bool EnemyinfieldOfView(Transform looker, float maxAngel, Transform targeter)
     {
         if (targeter != null)
         {
             Vector3 targetDir = targeter.transform.position - transform.position;
             float angel = Vector3.Angle(targetDir, looker.forward);
             // shoot a ray to the direction of target
             Vector3 direction = targeter.transform.position - looker.position;
             RaycastHit hit;
             if (Physics.Raycast(looker.position, direction, out hit))
             {
                 // check if the ray hits the target
                 if (hit.transform == targeter.transform)
                 {
                     if (angel < maxAngel)
                     {
                         return true;
                     }
                 }
                 return false;
             }
             return false;
 
 
         }
         return false;
     }
     public GameObject EnemyInSight()
     { 
         // All gamobjects from enemyteam are checked whether are in field of view
         GameObject[] gos;
         gos = GameObject.FindGameObjectsWithTag(targetTeam);
         GameObject enemyinsight = null;
         foreach (GameObject go in gos)
         {
            float distance = Vector3.Distance(transform.position, go.transform.position);
            if(distance < target_finddistance && EnemyinfieldOfView(transform, target_findangel, go.transform))
             {
                 enemyinsight = go;
                 Debug.Log(enemyinsight);
                 return enemyinsight;
             }
         }
         return enemyinsight;
     }

Trying to create a field of view for the enemies

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