Three Random Objects From Array Without Repeat

Question

I'm trying to get three different objects to instantiate randomly in three locations so that every time I start the game the objects spawn in different places. As of right now, I was able to figure out how to get the objects to spawn at each location without any objects overlapping each other. However, the problem I have now is that the same object spawns three times.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class RandomItemsThree : MonoBehaviour {
 
     public GameObject[] slideSpots;
     public GameObject[] objects;
     GameObject randomObjects;
     GameObject firstObject;
     GameObject secondObject;
     GameObject thirdObject;
 
     int objectCount;
     int spawnCount;
 
     private void Start()
     {
         MyMethod();
     }
 
     void MyMethod ()
     {
         int spawn = Random.Range(0, slideSpots.Length);
         int stuff = Random.Range(0, objects.Length);
 
         randomObjects = objects[stuff];
 
         firstObject = GameObject.Instantiate(randomObjects, slideSpots[0].transform.position, Quaternion.identity);
         secondObject = GameObject.Instantiate(randomObjects, slideSpots[1].transform.position, Quaternion.identity);
         thirdObject = GameObject.Instantiate(randomObjects, slideSpots[2].transform.position, Quaternion.identity);
     }
 }

Answer 1

Answer by Jordash · Oct 31, 2018 at 01:43 AM

You're picking a random number with

          int stuff = Random.Range(0, objects.Length);

Then assigning randomObjects as the index of stuff into the objects array

 randomObjects = objects[stuff];

But because you only generate stuff as a random number once and assign randomObjects once it will always be the same random number and therefore same object. You'll need to have a copy of that code between each spawn for a new random number and object each time.

As a side note, if you do not want duplicates you can do a while loop for the random number generator checking against the last numbers, or copy the array and do a Fisher-Yates shuffle then pick the first three, or randomly pick from a list and remove spawns/objects when chosen. Make sure you check there are more than three items in the array for these approachs though.

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Three Random Objects From Array Without Repeat

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