Unity的Raycasting对象检测2D的问题

Question

因此，我试图使敌人 ai 检测到unity raycaster 的球员。 ai 在工作时，即使玩家的里程比我想要的更远，也可以检测到玩家的里程。你能帮我吗？ 另外，我得到了arigidbody2d和一个播放器目标。 seedistance是2个

代码：

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

public class enemyMove : MonoBehaviour
{
    public int speed;
    private bool movingRight = true;
    public bool SeenPlayer = false;
    public Transform target;
    public float seeDistance;
    public int health = 3;
    public Rigidbody2D rb;

    public Transform groundDetection; 

    void Start()
    {
        target = GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>();
        rb = GetComponent<Rigidbody2D>();
        
    }

    void Update()
    {

        if (SeenPlayer == false)
        {
            transform.Translate(Vector2.right * speed * Time.deltaTime);
        }
        else
        {
            transform.position = Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
            transform.localScale = new Vector3(0.5f, 0.5f, 0.5f);
        }

        RaycastHit2D groundInfo = Physics2D.Raycast(groundDetection.position, Vector2.down, 2f);
        RaycastHit2D SeePlayer = Physics2D.Raycast(groundDetection.position, Vector2.left, seeDistance);
        if (groundInfo.collider == false)
        {
            if (movingRight == true)
            {
                transform.eulerAngles = new Vector3(0, -180, 0);
                movingRight = false;
            }
            else
            {
                transform.eulerAngles = new Vector3(0, 0, 0);
                movingRight = true;
            }
        }
        if (SeePlayer)
        {
            SeenPlayer = true;
        }
    }
    private void OnTriggerEnter2D(Collider2D collision)
    {
        BulletScript bullet = collision.GetComponent<BulletScript>();
        if (bullet != null)
        {
            //Destroy(gameObject);-
            health -= 1;
            Destroy(bullet.gameObject);
            if (health == 0)
            {
                Destroy(gameObject);
            }
            else
            {
                rb.AddForce(new Vector2(4, 2), ForceMode2D.Impulse);
            }
        }
    }
}

Answer 1

问题在于：

if(SeePlayer){
    SeenPlayer = true;
}

seeplayer是类型的raycasthit2d（struct）。结构永远不会零，因此条件

if(SeePlayer)

总是满足的。您可能应该检查内部的对撞机是否有效：

if(SeePlayer.collider)

编辑：
我想

if(SeePlayer != default(RaycastHit2D))

也会做这项工作