Weird problem about enemy AI

Questions & Answers
1

Hello everyone. I got a problem and need a lead way to solve it. In my scene, there are two enemies. Player is behind them. What I want is, if player fires his rifle, enemies will hear it and turn and shoot player. I made a enemy AI code, and deactivated it. If it’s active, enemies will start firing at us immediately. So what I need to do is, activate the enemy AI code and apply an animation to enemy AI for realistic “hearing bullet sound” effect when player fires. I made a code like this :

#pragma strict

static var isFired : boolean = false; // this is true when player shoots

function Update () {

Find();

}

function Find() {

  if(isFired) { 
var enemies : GameObject[];
enemies = GameObject.FindGameObjectsWithTag("Enemy"); // detect those two enemies

  for ( var enem : GameObject in enemies)
    { 
    if(enem){ // if there is any object in enemies array in the scene
        enem.animation.Play("lookAround");
        yield WaitForSeconds(1);
        enem.GetComponent(aiDuran).enabled=true; // enable the AI code
      
   }
isFired=false;
    }
             }


 
}

So this code works fine if I fire to somewhere in the scene. They play their look around animations and then their AI becomes activated and they shoot. But if I directly fire at enemy to kill, after the enemy is dead it gives an error. It says : The object of type GameObject has been destroyed but you are still trying to access it. And when I click the error it shows this line :

enem.GetComponent(aiDuran).enabled=true;

What I understand is, I fire, isFired becomes true, while code waits for 1 second, the enemy becomes dead ( my weapons damage is high kills instantly the enemy ) and then when it comes this line :

enem.GetComponent(aiDuran).enabled=true;

it gives error because the enemy is already dead and destroyed itself. If I change the code like this :

static var isFired : boolean = false; // this is true when player shoots

function Update () {

Find();

}

function Find() {

  if(isFired) { 
var enemies : GameObject[];
enemies = GameObject.FindGameObjectsWithTag("Enemy"); // detect those two enemies

  for ( var enem : GameObject in enemies)
    { 
    if(enem){ // if there is any object in enemies array in the scene
       
    
        enem.GetComponent(aiDuran).enabled=true;
      
   }
isFired=false;
    }
             }


 
}

everything works fine, but it looks ridiculous because the enemy starts firing at the same time we fire, there is no animation and it looks bad. I don’t want it, how can I fix the problem ? Thanks :slight_smile:

2

first add a delay based on the distance from the enemy,

so you can simulate the sound distance,

i added a small thing that calculates the distance from the player and divides it by 100.

20 units away will give a delay of 0.2 sec.

i wrote it here in the web so check the syntex.

sfc

static var isFired : boolean = false; // this is true when player shoots
 var  dist:float;
var player: Transform;

function Update () {

Find();

}

function Find() {

  if(isFired) { 
var enemies : GameObject[];
enemies = GameObject.FindGameObjectsWithTag("Enemy"); // detect those two enemies

  for ( var enem : GameObject in enemies)
    { 
    if(enem){ // if there is any object in enemies array in the scene
    



        dist = Vector3.Distance(player.position, enem .transform.position);

        yield WaitForSeconds(dist /100);
    
        enem.GetComponent(aiDuran).enabled=true;

   }
isFired=false;
    }
             }



}
3

then you double check it

before and after the delay.

static var isFired : boolean = false; // this is true when player shoots
var dist:float;
var player: Transform;

function Update () {

Find();

}

function Find() {

if(isFired) {
var enemies : GameObject;
enemies = GameObject.FindGameObjectsWithTag(“Enemy”); // detect those two enemies

for ( var enem : GameObject in enemies)
{
if(enem){ // if there is any object in enemies array in the scene

    dist = Vector3.Distance(player.position, enem .transform.position);

    yield WaitForSeconds(dist /100);
    if(enem){
    enem.GetComponent(aiDuran).enabled=true;
    }

}
isFired=false;
}
}

}