What's wrong with my script?

Question

Here's the script.

 #pragma strict
 
 var enemy : Transform;
 private var spawnArea : Vector2;
 private var canSpawn : boolean = true;
 
 function Update () {
 
 if (canSpawn == true) {
 
     Instantiate (enemy, spawnArea, Quaternion.identity);
     canSpawn = false;
     
     WaitForSeconds(Random.Range(0, 3));
     canSpawn = true;
 
     }
 
 }

I want it to spawn every 0-3 seconds but it ends up spawning every frame. Any help?

Thanks in advance.

Answer 1

Best Answer

Answer by taxvi · Dec 29, 2014 at 10:15 AM

the WaitForSeconds is a special instruction used only in co-routine functions, google for more info. it won't work in Update function. what you need is a simple timer implementation.

 #pragma strict
  
  var enemy : Transform;
  private var spawnArea : Vector2;
 
 public var spawnTime : float = 3f;
 private var timer : float = 0f;
  
  function Update () {
  
  if (timer > spawnTime) {
  
      Instantiate (enemy, spawnArea, Quaternion.identity);
      
      timer = 0f;
 
 //another note here:
 //if you don't add 'f' at the end of the numbers, unity will take them as integers
 //and return a random integer between 0, 3.
 //t$$anonymous$$s will return random float:
 
      spawnTime = Random.Range(0f, 3f);
      }
  
 timer += Time.deltaTime;
  }

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Chickenator · Dec 29, 2014 at 10:17 AM 0

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This might make me sound stupid (I'm kinda new to Unity) but what's the "f" next to the numbers for? @taxvi

taxvi · Dec 29, 2014 at 10:18 AM 0

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it means that the number is a float, not an integer.

Chickenator · Dec 29, 2014 at 10:19 AM 0

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Oh xD should've read the notes. You said what it was there

taxvi · Dec 29, 2014 at 10:20 AM 0

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and it can take decimal values like 4.95, while integers can not

MSpiteri · Dec 29, 2014 at 10:30 AM 1

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@Chickenator Yes, what you said is correct. But when it comes to numbers with a decimal point, there are 3 types:

float, double, decimal

The difference is the precision (how many digits you can have in the number).

float is 32 bits

double is 64 bits

decimal is 128 bits

More info here: http://msdn.microsoft.com/en-us/library/ms228360(v=vs.90).aspx

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