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Question by Sydneynumber9 · Aug 25, 2021 at 10:59 AM · c#3dvr

Enemy should follow the Player if he is in range, but how?

Hello Together, hope someone can help me. I just want that the enemy starting to follow the player if he is in range.

I have this script on my enemy and he following the Playercontroller:

I would be so happy if someone can help me

 public class EnemyController1 : MonoBehaviour
 {
     Animator animator;
     public float minSpeed = 3f;
     public float maxSpeed = 4;
     public AudioClip deathAudio;
     public Transform target;
     private NavMeshAgent agent;
     private Rigidbody[] rbs;
 
     // Start is called before the first frame update
     void Start()
     {
         rbs = GetComponentsInChildren<Rigidbody>();
         agent = GetComponent<NavMeshAgent>();
         target = GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>();
         GetComponent<Animator>().speed = Random.Range(minSpeed, maxSpeed);
         DisactivateZombie();
     }
 
     void Update()
     {
         agent.SetDestination(target.position);
 
         if (Vector3.Distance(target.position, transform.position) < 1.5f)
             UnityEngine.SceneManagement.SceneManager.LoadScene(0)
     }
  
     
     private void OnCollisionEnter(Collision collision)
     {
         if (collision.transform.tag == "Weapon")
         {
          
             Destroy(gameObject);
             scoreCounter.UpdateScore();
             ActivateZombie();
             agent.enabled = false;
             GetComponent<Animator>().enabled = false;
             Destroy(collision.gameObject);
             
         }
     }
 }
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Answer by mustafacomert00 · Aug 25, 2021 at 01:02 PM

Use OverlapSphere or OverlapBox around enemy, if that sphere contains player's collider then setDestination of the enemy like

agent.SetDestination(target.position);

 float radius = 1;//set this whatever value you like
 
 void Update()
 {
      if(IsPlayerInRange(transform.position))
               agent.SetDestination(target.position);
 }
 
 bool IsPlayerInRange(Vector3 center){
         Collider[] hitColliders = Physics.OverlapSphere(center, radius);
         foreach (var hitCollider in hitColliders)
         {
             if(hitCollider.gameObject.CompareTag(target.tag)
             {
                    return true;
              }
         }
         return false  
 }

This can be optimized a lit bit, if you want

Lastly, The Code after

Destroy(gameObject) won't be executed, for that reason, lines below are useless in your code.

scoreCounter.UpdateScore(); ActivateZombie(); agent.enabled = false; GetComponent<Animator>().enabled = false; Destroy(collision.gameObject);

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Answer by Sydneynumber9 · Aug 25, 2021 at 01:47 PM

Hello @mustafacomert00 , thanks for you quick and very good explanations. I still receive an error some syntax :)

I get this error:

 NullReferenceException: Object reference not set to an instance of an object
 over.Update ()

on this line: agent.SetDestination(target.position);

you know why?

Best regards and thank you so much

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avatar image mustafacomert00 · Aug 25, 2021 at 01:55 PM 0
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Make sure you call

 agent = GetComponent<NavMeshAgent>();
 target = GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>();

and enemy has NavMeshAgent component

avatar image Sydneynumber9 · Aug 26, 2021 at 12:11 PM 0
Share

Thanks you so much, everything is working, only the player reset if the enemy hit the player is not working.... i made it with scenemanager

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