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

public class TestWhile : MonoBehaviour
{
    List<Vector3> positions = new List<Vector3>();

    void Start()
    {
        StartCoroutine(test());
    }

    IEnumerator Spawn(Vector3 p)
    {
        GameObject obj = GameObject.CreatePrimitive(PrimitiveType.Cube);

        obj.transform.position = p;

        index += 0.5f;

        yield return null;
    }


    float index = 0;
    IEnumerator test()
    {
        do
        {

            var listDir  = new List<Vector3> {
                Vector3.up,
                Vector3.down,
                Vector3.left,
                Vector3.right,
                Vector3.forward,
                Vector3.back,

                Vector3.up+Vector3.left,
                Vector3.up+Vector3.right,

                Vector3.down+Vector3.left,
                Vector3.down+Vector3.right,

                Vector3.up+Vector3.forward,
                Vector3.up+Vector3.back,

                Vector3.down+Vector3.forward,
                Vector3.down+Vector3.back,

                Vector3.left+Vector3.forward,
                Vector3.left+Vector3.back,

                Vector3.right+Vector3.forward,
                Vector3.right+Vector3.back,
            };

            var randomDirection = listDir[Random.Range(0, listDir.Count)] * index;

            if (!positions.Contains(randomDirection)) {
                positions.Add(randomDirection);

                yield return Spawn(randomDirection);
            }
            else
                yield return null;
        }
        while (true);
    }

}