Enemy ai Ignore walls! help!

Question

Hello, it turns out that I have created an AI script that works like this: the enemy has a distance of detection of the player, when the player enters that area, the enemy looks at it until the player moves away, but it turns out that the enemy detects my player through the walls or colliders (I mean, if I hide behind a wall he detects me the same), does anyone know anything? Thank you!

 #pragma strict
 
 var Target : Transform;
 var Animador : Animator;
 var Distance : float = 30;
 var rotationDamping : float = 2;
 
 function Start ()
 {
 Animador.SetBool("Aiming", false);
 
 }
  
  function Update()
  {
      var distance = Vector3.Distance(Target.position, transform.position);
  
      if(distance <= Distance)
      {
          LookAtTarget();
          Animador.SetBool("Aiming", true);
      }   
      if(distance > Distance)
      {
          Animador.SetBool("Aiming", false);
      }   
 
     }
  
  function LookAtTarget()
  {
      var dir = Target.position - transform.position;
      dir.y = 0;
      var rotation = Quaternion.LookRotation(dir);
      transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * rotationDamping);
  }

Answer 1

Best Answer

Answer by Klarzahs · Jan 08, 2019 at 01:00 PM

Hi,

you could add a raycast before you actually turn towards the player. This can quickly become resource intense, especially if you have multiple enemies and call it in every Update() call.

You can use the following c# code snippet (untested)

 void Update() {
     var distance = Vector3.Distance(Target.position, transform.position);

     if (distance <= Distance && IsPlayerVisible()) {
           ...
     }
     ...
 }

 boolean IsPlayerVisible(){
     Vector3 dir = Target.position - transform.position;
     //save the first hit into a variable.
     RaycastHit hit;
     if(Physics.Raycast(transform.position, direction, out hit)){
             //eg check the tag of "hit.transform" - is it the player or a wall?
             //if it is a wall, return false
     }
 }

Remember, Multiple raycast per Update cycle are bad practice. You can add a counter, that gets increased every update and calls the raycast at value X.

Hope this helps, sorry, that I cant provide you with the javascript code

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el-mas-pro-470 · Jan 08, 2019 at 01:12 PM 0

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How to assembly the script? i am a begginer from C#

 using UnityEngine;
 using System.Collections;
 
 public class EnemyAI : MonoBehaviour {
     public Animator Animador;
     public GameObject EnemyObject;
     public float Distance;
     public float RotationDamping;
     public Transform Target;
     public Vector3 direction;
 
     void Update() {
         var distance = Vector3.Distance(Target.position, transform.position);
         if (distance <= Distance && IsPlayerVisible()) 
         {
             LookAtTarget();
         }
     }
 
     void LookAtTarget()
     {
         var dir = Target.position - transform.position;
         dir.y = 0;
         var rotation = Quaternion.LookRotation(dir);
         transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * RotationDamping);
     }
     bool IsPlayerVisible(){
 
         Vector3 dir = Target.position - transform.position;
         //save the first hit into a variable.
         RaycastHit hit;
         if(Physics.Raycast(transform.position, direction, out hit)){
             //eg check the tag of "hit.transform" - is it the player or a wall?
             //if it is a wall, return false
         }
     }
     }

Klarzahs el-mas-pro-470 · Jan 08, 2019 at 01:25 PM 0

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Like this ;)

 ...
 private int delayCount = 0;
 private int maxDelay = 10;
 private bool wasLastVisible = false;
 
 ...
 
 bool IsPlayerVisible() {
         delayCount++;
         if (delayCount == maxDelay) {
             //reset the count
             delayCount = 0;
 
             Vector3 dir = Target.position - transform.position;
             //save the first hit into a variable.
             RaycastHit hit;
             if (Physics.Raycast(transform.position, direction, out hit)) {
                 if (hit.transform.tag.Equals("Player")
                     wasLastVisible = true;
                 else
                     wasLastVisible = false;
             }
         }
         return wasLastVisible;
 
     }

You'll need to find a good value for the maxCount. Too low will cost you resources due to many raycasts, too high and youll have a "lag" in your game - Even though the player now might be visible, you still take the old result.

el-mas-pro-470 Klarzahs · Jan 08, 2019 at 02:25 PM 0

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Thanks you!

Enemy ai Ignore walls! help!

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