Unity Random Spawn Grid : Free script to randomly spawn objects in grid formation

If you want to spawn your prefab based on an imaginary grid, you can use this script. For example you want to create a scene with a lot of asteroids across the player, you can make an empty game object, attach this script and set reference to your asteroid stone prefab, then run the game.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class RandomSpawnGrid : MonoBehaviour
{
	
	public GameObject prefabToSpawn;
	
	public int width = 1000;
	public int length = 1000;
	public int height = 1000;
	public int step = 100;
	public int randomFactor = 3;
	
    // Start is called before the first frame update
    void Start()
    {
		for(int h = 0; h < length/step; h++){
			for(int i = 0; i < width/step; i++){
				int canSpawn = Random.Range(0, randomFactor);
				if(canSpawn == 0){
					Instantiate(prefabToSpawn, new Vector3(((i * step) + transform.position.x) - (width/2), transform.position.y + (Random.Range(-(height/2), (height/2))), ((h * step) + transform.position.z) - (length/2)), Quaternion.Euler(new Vector3( Random.Range(0, 360), Random.Range(0, 360),  Random.Range(0, 360))));
				}
			}
		}
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}