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Question by Cheenodash · Feb 14, 2013 at 08:26 PM · javascriptprefabspawn

How do I spawn enemies based on a timer?

Hey, I want to make a very simple enemy spawner, for a 2D game, but I'm new to Unity3D and I;m not sure how to go about doing it. I have 4 prefabs, named spawn1, spawn2, spawn3 and spawn4 - 2 of which are located on the left of the screen, 2 on the right. Here is the code on the prefab:

 var enemySpeed: int;
 
 function Update () {
 
 amtToMove = enemySpeed * Time.deltaTime;
 
 transform.Translate(Vector3.left * amtToMove);
 //transform.Translate(Vector3.right * amtToMove);  - for the prefabs on the left of the screen
 
 }

I have a timer that counts down for 120 seconds, which uses the variables displayMinutes and displaySeconds. I want each of the prefabs to spawn a new enemy every 3 seconds. Is there a way I can do this?

Thanks in advance! :D

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Answer by Benproductions1 · Feb 14, 2013 at 10:12 PM

Of course there is a way to do this:

Intead of having a countdown timer, which is quite innacurate and slow, you could just save the time you want the enemy to spawn and compare it to the current time (`Time.time`)

 var Enemy:Transform;
 private var Timer:float;
 
 function Awake() {
     Timer = Time.time + 3;
 }
 
 function Update() {
     if (Timer < Time.time) { //This checks wether real time has caught up to the timer
         Instantiate(Enemy, transform.position, transform.rotation); //This spawns the emeny
         Timer = Time.time + 3; //This sets the timer 3 seconds into the future
     }
 }

Of course you could make things more random and other stuff, but this will spawn an enemy every 3 seconds.

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avatar image Cheenodash · Feb 14, 2013 at 10:53 PM 0
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I'll test this later, thanks for the reply!

avatar image Cheenodash · Feb 14, 2013 at 11:33 PM 0
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This does work, but it spawns hundreds of the enemies instantly D:

avatar image Benproductions1 · Feb 15, 2013 at 12:07 AM 0
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Ive edited the answer to include a possible fix??? Plz tell me if it works :)

avatar image Cheenodash · Feb 15, 2013 at 12:30 AM 0
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That works perfectly! Thank you very much!

avatar image Benproductions1 · Feb 15, 2013 at 01:06 AM 0
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If my answer is correct please accept it as the answer :)

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