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Question by alone1992 · Nov 25, 2013 at 08:50 AM · positionrandom

instantiate random object in Specified positions?

hello I have 14 different cubes and want to randomly put them in specified 15 positions one of that positions should be empty. how can I do that!? please javascript thanks

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Answer by Tomer-Barkan · Nov 25, 2013 at 09:10 AM

You can put all your possible positions in a list, then choose one randomly, spawn the cube there, and remove it from the list. Until one remains:

 public Vector3[] positions = new Vector3[15]; 
 public GameObject cubePrefab;
 
 public void Start() {
     List<Vector3> positionsList = new List<Vector3>(positions); // convert possible positions to list

     // iterate as long as more than one position remains
     while (positionsList.Count > 1) {
         int chosenPositionIndex = Random.Range(0, positionsList.Count); // choose random position from list
         GameObject.Instantiate(cubePrefab, positionsList[chosenPositionIndex], Quaternion.identity); // create a cube at position
         positionsList.RemovaAt(chosenPositionIndex); // remove position from list
     } 
 }

Be sure to put the possible positions in the inspector, and the prefab for the cube.

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avatar image Tomer-Barkan · Nov 25, 2013 at 01:15 PM 1
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You copied something wrong.

positionsList should be a List not a Vector3[].

avatar image Tomer-Barkan · Nov 25, 2013 at 02:20 PM 1
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So does it work?

avatar image Tomer-Barkan · Nov 25, 2013 at 04:00 PM 1
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When you create a script via unity it automatically adds the using clauses to include the unity libraries. Use those.

avatar image Tomer-Barkan · Nov 25, 2013 at 04:32 PM 1
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There's no List1 in my code... typo?

avatar image Tomer-Barkan · Nov 25, 2013 at 04:38 PM 1
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Add:

 using System.Collections.Generic;

That's where the List class is defined.

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