如何更改代码以从枪中发射照明弹？

Question

我有一个运动学刚体和一个附加到该对象的 2d 碰撞器。我想做的是让我的角色发射照明弹来分散导弹对玩家的注意力。这是我的代码：

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

public class flareShoot : MonoBehaviour
{
    public GameObject flarePrefab;  // Prefab for the flare
    public Transform flareSpawnPoint;  // Spawn point for the flare on the player
    private GameObject currentFlare;  // Current flare instance
    public float fireForce = 10f;  // Force to apply when firing the flare

    void Start()
    {
        SpawnFlare();
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space) && currentFlare != null)
        {
            FireFlare();
        }
    }

    void SpawnFlare()
    {
        currentFlare = Instantiate(flarePrefab, flareSpawnPoint.position, flareSpawnPoint.rotation, flareSpawnPoint);
        currentFlare.GetComponent<Rigidbody2D>().isKinematic = true;  // Disable physics while attached
    }

    void FireFlare()
    {
        currentFlare.transform.SetParent(null);  // Detach from player
        Rigidbody2D rb = currentFlare.GetComponent<Rigidbody2D>();
        rb.isKinematic = false;  // Enable physics
        rb.gravityScale = 1;  // Enable gravity if needed
        rb.AddForce(flareSpawnPoint.up * fireForce, ForceMode2D.Impulse);  // Apply force to fire
        currentFlare = null;  // Reset the reference to the flare
    }
}

Answer 1

虽然你的问题不太清楚，但你的问题已经很清楚了。发射第一个照明弹后，您的

currentFlare

为

null

。因此，如果您再次尝试 FireFlare，您将尝试设置

null

的变换，并尝试获取 null 的 Rigidbody2D。

这可以通过

FireFlare

中添加一行来解决：调用

SpawnFlare()

    void FireFlare()
    {
        currentFlare.transform.SetParent(null);  // Detach from player
        Rigidbody2D rb = currentFlare.GetComponent<Rigidbody2D>();
        rb.isKinematic = false;  // Enable physics
        rb.gravityScale = 1;  // Enable gravity if needed
        rb.AddForce(flareSpawnPoint.up * fireForce, ForceMode2D.Impulse);  // Apply force to fire
        currentFlare = null;  // Reset the reference to the flare
        SpawnFlare(); // Create a new flare after setting the previous one to null, so next time you can fire a new one.
    }
}

如果您不想将发射照明弹与获取新照明弹联系起来，也可以将其放在更新中（以防您想在几秒钟后生成新的照明弹）。

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space) && currentFlare != null)
        {
            FireFlare();
            SpawnFlare();
        }
    }