Spawning enemy at random spawn points without Overlapping!

Questions & Answers
1

Hi Unity Answers,

I want to spawn Enemies at random spawn points without overlapping.
So, I’m checking that if the spawn point is used then don’t use that spawn point, if it’s not then continue…
I’ve an empty gameObject which contains all spawnPoints for enemy.
I’ve assigned the script to that empty gameobejct.

I tried to use Transform as a List for Spawn points but unfortunately, it didn’t work.
If you can convert this from Vector3 to Transform then, it’ll be good. I tried to convert this in Transform but I got so many error. I did try, but, it didn’t work as expected.

You can check that script here:
Transform Error Script
Errors in that script is here:
Image Transform error

Now,
The script which I’m working on is as follow:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class EnemySpawns : MonoBehaviour {

	public GameObject enemy; //my enemy
	public float spawnTime = 3f; //spawn after 3 sec
	public List<Vector3> spawnPoints = new List<Vector3> (); //Vector3 positions of spawnpoints.
	public float distance;   //distance from the spawnPoints



	void Start ()
	{
		//spawnRandom ();
		InvokeRepeating ("spawnRandom", spawnTime, spawnTime); //Call this fucntion after 3sec.
	}

	public Vector3 spawnRandom(){
		
		Vector3 newSpawnPoint;  //new spawn point 
		Vector3 random = UnityEngine.Random.insideUnitSphere * distance;

		newSpawnPoint = new Vector3 (random.x, 0, random.z);

		newSpawnPoint += transform.position;

		if (!spawnPoints.Contains (newSpawnPoint)) {
			return newSpawnPoint;
			spawnPoints.Add (newSpawnPoint);
			int spawnIndex = Random.Range (0, spawnPoints.Count);
			Instantiate (enemy, spawnPoints [spawnIndex].normalized, Quaternion.identity);  //Spawn randomly
		} else {
			return Vector3.zero;
Deug.Log("Enemy is overlapping!");

		}
	}

}

The problem is:
Enemy is not spawning at all!
Thanks!

2

Just check if the enemy is colliding with another enemy.

3

I would have the empty game object go to a random area with a Navmesh that is twice as large as your largest enemy, have it always find a new valid area and go to it, give it a lot of speed and have it instantiate an enemy every three seconds. Give it a rigidbody along with everything else, but give it a lot smaller weight so it can’t push your enemies, make these on a separate collision layer so your player can’t interact with it.

code for the random movement

  using UnityEngine.AI;
 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 public class EnemySpawns : MonoBehaviour {

public GameObject enemy;
public float distance = 10; 
public float spawnTime = 3;
void Start ()
     {
         //spawnenemy
         InvokeRepeating ("spawn", spawnTime, spawnTime); //Call this fucntion after 3sec.
     }
    void FixedUpdate ()
{
    	Vector3 randomDirection = Random.insideUnitSphere * distance;
    			 randomDirection += transform.position;
     NavMeshHit hit;
     NavMesh.SamplePosition(randomDirection, out hit,distance, 1);
     Vector3 fleePosition = hit.position;
     agent.ResetPath();
                agent.destination = fleePosition;
}

public void Spawn ()
{
  Instantiate (enemy, transform.position);
}

}