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Question by metal_invader · Oct 28, 2012 at 08:49 PM · instantiatevariablespacing

Spacing objects out when instantiated using variables.

I had trouble with a script earlier that was supposed to spawn an increasing amount of objects. Now the script is almost finished but now I'm having a different problem. From the documentation on instantiating objects there was a method in there that spaced out the objects. namely this:

 for(var w : int = 0; w < 10; w++)
         {
         Instantiate(prefab, Vector3(w * 2, 0, 0), Quaternion.identity);
         }


now in my code I have replaced vector 3 with a variable but unity doesn't seem to like this.

 var wave_number = 0;
 var wave_text : GUIText;
 var wave_amount = 5;
 var background_timer = 0;
 var wave : boolean;
 var prefab : Transform;
 var spawnpoint : Transform;
 private var spawnpoint_location : Vector3;
 
 function Start () {
 }
 
 function Update () {
 background_timer = Time.time % 11;
     if(background_timer == 10)
     {
     wave = true;
     Invoke("New_Wave", 1);
     }
 }
 
 function New_Wave () {
     if(wave)
     {
     spawnpoint_location = spawnpoint.position;
     wave_number++;
     wave_amount += 5;
     Debug.Log("Wave number is " + wave_number.ToString() + ". " + "There are " + wave_amount.ToString() + " enemies.");
     wave = false;
     wave_text.text = ("Wave " + wave_number.ToString() );
         for(var w : int = 0; w < wave_amount; w++)
         {
         Instantiate(prefab, spawnpoint_location(w * 2, 0, w * 2), Quaternion.identity);
         }
     }
 
 }

With the above code I get this error:

Assets/Scripts/wave_spawner.js(35,37): BCE0077: It is not possible to invoke an expression of type 'UnityEngine.Vector3'.

And removing the part in the loop that spawns the NPCs in a spaced fashion gets rid of the error, but when they instantiate they are all on top of each other.

My question is, how can I space the objects out while keeping the location as a variable (with which I can place a GameObject in to manually set a spawn point)?

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Answer by aldonaletto · Oct 28, 2012 at 08:57 PM

Calculate spawnpoint_location each iteration, like this:

    for(var w : int = 0; w < wave_amount; w++)
    {
    spawnpoint_location = spawnpoint.position + Vector3(w * 2, 0, w * 2); 
    Instantiate(prefab, spawnpoint_location, Quaternion.identity);
    }
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avatar image metal_invader · Oct 28, 2012 at 09:11 PM 0
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Yep. That took care of the error. Though I wonder why unity doesn't like that I try to space them out in the instantiate function?

avatar image aldonaletto · Oct 28, 2012 at 09:57 PM 0
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You could calculate the position directly in the Instantiate function call as well:

 Instantiate(prefab, spawnpoint.position + Vector3(w * 2, 0, w * 2), Quaternion.identity);

The problem with your original code was generated by this expression:

 spawnpoint_location(w * 2, 0, w * 2)

This looks to the compiler as a call to a function referenced by spawnpoint_location.

avatar image metal_invader · Oct 28, 2012 at 10:03 PM 0
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Ooooh I see. Thank you for explaining.

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