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Question by werneroi · Jan 02, 2012 at 01:08 AM · instantiaterandomprefabs

instantiate a prefab from array and then changing it

i am trying to build a pickup item that when it instantiate it will randomly choose between 4 different prefabs and then will swap them randomly. The following script (JS) works well with changing the material of the game object, but i want it to do the same with prefabs as opposed to the materiel.

 var materials : Material[];
 var changeInterval = 1.0;
 public var type:int;
 var index : int = Time.time / changeInterval;
 
 
 function Awake()
 {        
 
     // set a random type to begin
      SwapType();
 }
  
 function SwapType()
 {    
     // generate a random number between 1 and 10
     var random:float = Random.Range(1,100);
  
     // set the type
     if (random <= 25) 
     {
         index = 0
     }
     else if (random >= 75) 
     {
         index = 1;
     }
     else if (random >= 25 && random <= 50 )
     {
         index = 2;
     }  
     else
     {
         index = 3;
     }
 }
 
 function Update () 
 {
     if (materials.Length == 0)
     return;
     
     index = index % materials.Length;
 
     // assign it to the renderer
 
     renderer.sharedMaterial = materials[index];
     
     
 }
 
 //change type after time
 // min and max times for type change
 public var minTypeChange:int = 1;
 public var maxTypeChange:int = 3;
  
 function Start()
 {
     while (true)
     {
         // wait for X seconds
         yield WaitForSeconds(Random.Range(minTypeChange, maxTypeChange));
  
         // set a random type
         SwapType();
     }
 }
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avatar image kevork · Jan 02, 2012 at 04:11 AM 0
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Unfortunately, it is not very clear what you are asking to do. You can randomly pick a number and use that to deter$$anonymous$$e which prefab to instantiate.

It wasn't your question, but the SwapType() function can be replaced with just the line: index = Random.Range(0, materials.Length); assu$$anonymous$$g materials.Length > 0.

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Answer by Rod-Green · Jan 02, 2012 at 04:35 AM

This will randomly Instantiate a prefab from a list .. however it is in c#

Add it to any object and set the prefab choices.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 
 public class RandomPrefab : MonoBehaviour
 {
     public List<GameObject> m_prefabChoices;
     
     
     void Awake()
     {
         if(m_prefabChoices == null || m_prefabChoices.Count == 0)
             return;
         
         Instantiate(m_prefabChoices[Random.Range(0, m_prefabChoices.Count)], transform.position, transform.rotation);        
         DestroyImmediate(this.gameObject); // self descruct
     }
 }
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