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Question by RenanGusman · May 24, 2017 at 07:41 AM · spriterandomrandom.range

How to randomly put my game objects in 3 previously setup vectors2 without repeating 2 objects in the same Vector2?

I'm trying to make a level that the objects spawn randomly between 3 vectors2, each one containing a different object. The problem is that i can't think of a way to do this without 2 objects getting on the same position. Is there any way to use random.range that it would not repeat?

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Answer by Zooow · May 24, 2017 at 01:44 PM

No there's no parameter in Random.Range() to make it not repeat. So you need to manage your random logic.

Here's how you can do it:

  1. store your vector2 position in a List

  2. randomly draw your first vector2 position from the list

  3. remove the vector2 position your draw from the list

  4. goto 2 ^_^

in code, it would be something like that :

         // create your list
         List<Vector2> positionList = new List<Vector2>();
 
         // add your vector 2 positions in the list
         positionList.Add(Vector2.left);
         positionList.Add(Vector2.right);
         positionList.Add(Vector2.down);
 
         // randomly draw your first position
         int positionIndex = Random.Range(0, positionList.Count);
         Vector2 rndPosition = positionList[positionIndex];
 
         //... assign the rndPosition...
 
         // then remove this vector2 position form the list, so your list contains only valid positions
         positionList.RemoveAt(positionIndex);
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