PlaneDemo

用到知识点：坐标系转换、Input类

using System.Collections.Generic;
using UnityEngine;

///<summary>
///控制飞机飞行，边界设定
///</summary>
public class Plane : MonoBehaviour
{
    private float hor;
    private float ver;

    private Vector3 dir;
    public float flySpeed=1f;


    private void Update()
    {
        hor=Input.GetAxis("Horizontal");
        ver = Input.GetAxis("Vertical");

        
        Vector3 screenPoint = Camera.main.WorldToScreenPoint(this.transform.position);
        if(screenPoint.x<0&&hor<0)screenPoint.x = Screen.width;
        if (screenPoint.x > Screen.width && hor > 0) screenPoint.x = 0;
        this.transform.position=Camera.main.ScreenToWorldPoint(screenPoint);

        if (screenPoint.y > Screen.height&&ver>0||screenPoint.y<0&&ver<0) ver = 0;

        dir = new Vector3(hor, 0, ver);
        this.transform.position += dir * flySpeed * Time.deltaTime;

    }
}