Unity3D克隆对象销毁后仍留存于层级面板的解决方法

我编写了一段代码，用于在对象靠近玩家原点时克隆它们，当对象越过原点时销毁它们。该脚本挂载在两个游戏对象上。运行游戏时，原始对象销毁后会从层级面板中消失，但克隆对象销毁后仅从游戏画面消失，仍留存于层级面板中，请问该如何修复这个问题？

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

public class MoveTraffic : MonoBehaviour
{
    
    private float vehicleSpeed = 8.0f;
    private Vector3 startPosition;
    private bool needsDuplicate = true;
    // Start is called before the first frame update
    void Start()
    {
        startPosition = transform.position;
        // force startPosition Z to be at the edge of the road;
        startPosition.z = 178.0f;
    }

    // Update is called once per frame
    void Update()
    {
        // Move the vehicle forward or backward
        transform.Translate(Vector3.forward * Time.deltaTime * vehicleSpeed);

        //create duplicates at certain points along the road, starting them back at startPosition.
        var pz = transform.position.z;
        if (needsDuplicate)
        {
            //if ((pz < 178f * .75 && pz > 178f * .7) || (pz < 178 * .5 && pz > 178f* .4))
            if (pz < 178 * .5 && pz > 178f * .4)
            {
                Instantiate(this, startPosition, transform.rotation);
                needsDuplicate = false;
            }
        }
        else
        {
            //if ((pz < 178f * .7 && pz > 178f * .6) || (pz < 178 * .5 && pz > 178f * .6))
            if (pz < 178 * .5 && pz > 178f * .6)
            {
                needsDuplicate = true;
            }
        }
            
        //Respawn and destroy when it gets to the end of the road.
        if (transform.position.z < -2)
        {
            //transform.position = new Vector3(transform.position.x, transform.position.y, restartZ);
            Instantiate(this, startPosition, transform.rotation);
            Destroy(this.gameObject);
        }
    }
}

问题根源与修复方案 #

1. 核心问题：错误的克隆目标

你当前使用Instantiate(this, ...)克隆的是脚本组件，而非游戏对象本身。Unity会自动为克隆的脚本创建一个空GameObject并挂载该组件，这种方式可能导致对象销毁时，层级面板无法正确同步移除操作。

2. 次要问题：无效的条件判断

else分支中的if (pz < 178 * .5 && pz > 178f * .6)逻辑矛盾（数值范围无法同时满足），导致needsDuplicate永远无法重置为true，克隆逻辑会出现异常。

修改后的完整代码 #

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

public class MoveTraffic : MonoBehaviour
{
    
    private float vehicleSpeed = 8.0f;
    private Vector3 startPosition;
    private bool needsDuplicate = true;

    void Start()
    {
        startPosition = transform.position;
        startPosition.z = 178.0f;
    }

    void Update()
    {
        transform.Translate(Vector3.forward * Time.deltaTime * vehicleSpeed);

        var pz = transform.position.z;
        if (needsDuplicate)
        {
            if (pz < 178f * .5 && pz > 178f * .4)
            {
                // 改为克隆游戏对象本身，而非脚本组件
                Instantiate(this.gameObject, startPosition, transform.rotation);
                needsDuplicate = false;
            }
        }
        else
        {
            // 修复条件范围矛盾问题，示例调整为合理的数值区间
            if (pz < 178f * .6 && pz > 178f * .5)
            {
                needsDuplicate = true;
            }
        }
            
        if (transform.position.z < -2)
        {
            Instantiate(this.gameObject, startPosition, transform.rotation);
            Destroy(this.gameObject);
        }
    }
}

修复说明 #

• 替换Instantiate(this, ...)为Instantiate(this.gameObject, ...)：直接克隆目标游戏对象，确保销毁时能正确从层级面板移除。
• 修正else分支的条件判断：调整为合理的数值范围，保证needsDuplicate状态能正常重置，克隆逻辑可循环执行。

内容的提问来源于stack exchange，提问作者TecBrat