Making the enemy shoot only when player is alive

Question

I'm making a pretty simple bullethell game, and I would like the enemy to stop shooting when my player dies(it is active when alive, and not active when dead). I don't know where I fail in the code. It gives me a NullReferenceException when my player dies (gets deactivated).

var enemyLaser : GameObject; var fireFreq : float; var projectileSpeed:float = 0.0; private var lastShot : float;

 function Update () {
     if (Time.time > lastShot + fireFreq){
         Fire();
         }
 }
 
 function Fire() {
     lastShot = Time.time;
     var player = GameObject.Find("player");
         if (player.active){
                     var shoot = Instantiate(enemyLaser,transform.position,transform.rotation);
             shoot.rigidbody.velocity = (player.transform.position - transform.position).normalized * projectileSpeed;
             }
 }

Answer 1

Best Answer

Answer by Dave-Carlile · Feb 12, 2013 at 02:22 PM

If you're destroying or disabling the player when they die, then GameObject.Find wil no longer find that object. So after this line...

 var player = GameObject.Find("player");

The player variable will be null, then when you reference the player.active property...

         if (player.active)

you'll get a null reference exception. You can fix it by changing your if statement...

 if (player != null && player.active)
 {
    ... your stuff here ...
 }

So it will only execute the code inside if when the player object is found.

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Apinaheebo · Feb 12, 2013 at 02:33 PM 0

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Thanks, that indeed fixed the problem. I didn't realize GameObject.Find cannot find disabled objects.

Answer 2

Answer by asasababoon · Feb 12, 2013 at 03:34 PM

when deactivated it cant acces it. you could solve it by having an boolean in the player's script. and checking that value (if its alive or not)

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Making the enemy shoot only when player is alive

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