防止统一产生的游戏对象重叠

Question

Iam trying to make a simple 2d platformer game in unity. I managed to move the player and all other stuffs. The problem now i am facing is that the prefabs that randomly spawned onto the game is overlapping. So my question is how to prevent the overlapping of game objects. The prefabs i used is having different dimension(length). Here is the c# code i used:

    public class spawnscript : MonoBehaviour {
    public GameObject[] obj;
    public float spawnMin;
    public float spawnMax;

    // Use this for initialization
    void Start () {
        Spawn ();
    }

    void Spawn()
    {
        Instantiate (obj [Random.Range (0, obj.GetLength (0))], transform.position, Quaternion.identity);
        Invoke ("Spawn", Random.Range (spawnMin, spawnMax));
    }
}

Answer 1

void Spawn() {
    Instantiate(obj [Random.Range (0, obj.GetLength (0))], transform.position +(ADD OFFSET HERE WITH PREVIOUS OBJECTS Position), Quaternion.identity);
    Invoke("Spawn", Random.Range (spawnMin, spawnMax));
}

Answer 2

List<Vector3> existingPositions = new List<Vector3>();
void Spawn()
{
    var pos = RandomizePosition();
    if(HasOverlapped(existingPositions, pos)) // Your own logic to implement
    {
         //Either randomize the position again, or give it an offset, up to you
    }
    else
    {
        Instanciate(pos, ...);
        existingPositions.Add(...);
    }
}