繞圈圈

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{

Vector3[] T = new Vector3[4];
// Use this for initialization
void Start()
{
T[0] = new Vector3(100f, 0f, 100f);
T[1] = new Vector3(-100f, 0f, 100f);
T[2] = new Vector3(-100f, 0f, -100f);
T[3] = new Vector3(100f, 0f, -100f);

}
int aa = 0;

// Update is called once per frame
void Update()
{
transform.position = Vector3.MoveTowards(transform.position, T[aa], 50 * Time.deltaTime);
if (transform.position == T[aa])
aa = (aa + 1) % 4;


}
}