问改变transform.position绝不等于transform.position + transform.forward

EN

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

public class BulletScript : MonoBehaviour
{
    [SerializeField] PlayerAttacking PA;
    [SerializeField] float speed;
    Vector3 BulletEndDist;

    // Start is called before the first frame update
    void Start() {
        PA = GameObject.Find("AttackTrail").GetComponent<PlayerAttacking>();
        BulletEndDist = transform.position + (transform.forward * PA.TrailDistance) ;
    }

    // Update is called once per frame
    void Update() {
        if(transform.position == BulletEndDist)
        {
            Destroy(this.gameObject);
        }
        transform.Translate(new Vector3(0, 0, speed));
    }

    private void OnCollisionEnter(Collision collision) {
        if(collision.transform.tag == "Enemy")
        {
            // Decrease health
            Destroy(this.gameObject);
        }
        else
        {
            Destroy(this.gameObject);
        }
    }
}