如何检测与实例化预制件的碰撞

Question

我正在制作一个使用子弹的第一人称射击游戏，我正在尝试找到一种方法来删除当它击中敌人或墙壁但不起作用时的实例。我这样做的方法是给所有的墙壁和敌人一个特定碰撞检测的标签，但它似乎没有用对我来说。

请帮忙

using UnityEngine;
using TMPro;

public class BulletShoot : MonoBehaviour
{
    //bullet 
    public GameObject bullet;

    //bullet force
    public float shootForce, upwardForce;

    //Gun stats
    public float timeBetweenShooting, spread, reloadTime, timeBetweenShots;
    public int magazineSize, bulletsPerTap;
    public bool allowButtonHold;

    int bulletsLeft, bulletsShot;

    //Recoil
    public Rigidbody playerRb;
    public float recoilForce;

    //bools
    bool shooting, readyToShoot, reloading;

    //Reference
    public Camera fpsCam;
    public Transform attackPoint;

    //Graphics
    public GameObject muzzleFlash;
    public TextMeshProUGUI ammunitionDisplay;

    //bug fixing :D
    public bool allowInvoke = true;

    private void Awake()
    {
        //make sure magazine is full
        bulletsLeft = magazineSize;
        readyToShoot = true;
    }

    private void Update()
    {
        MyInput();

        //Set ammo display, if it exists :D
        //if (ammunitionDisplay != null)
        //ammunitionDisplay.SetText(bulletsLeft / bulletsPerTap + " / " + magazineSize / bulletsPerTap);
    }

    private void MyInput()
    {
        //Check if allowed to hold down button and take corresponding input
        if (allowButtonHold) shooting = Input.GetKey(KeyCode.Mouse0);
        else shooting = Input.GetKeyDown(KeyCode.Mouse0);

        //Reloading 
        if (Input.GetKeyDown(KeyCode.R) && bulletsLeft < magazineSize && !reloading) Reload();
        //Reload automatically when trying to shoot without ammo
        if (readyToShoot && shooting && !reloading && bulletsLeft <= 0) Reload();

        //Shooting
        if (readyToShoot && shooting && !reloading && bulletsLeft > 0)
        {
            //Set bullets shot to 0
            bulletsShot = 0;

            Shoot();
        }
    }

    private void Shoot()
    {
        readyToShoot = false;

        //Find the exact hit position using a raycast
        Ray ray = fpsCam.ViewportPointToRay(new Vector3(0.5f, 0.5f, 0)); //Just a ray through the middle of your current view
        RaycastHit hit;

        //check if ray hits something
        Vector3 targetPoint;
        if (Physics.Raycast(ray, out hit))
            targetPoint = hit.point;
        else
            targetPoint = ray.GetPoint(75); //Just a point far away from the player

        //Calculate direction from attackPoint to targetPoint
        Vector3 directionWithoutSpread = targetPoint - attackPoint.position;

        //Calculate spread
        float x = Random.Range(-spread, spread);
        float y = Random.Range(-spread, spread);

        //Calculate new direction with spread
        Vector3 directionWithSpread = directionWithoutSpread + new Vector3(x, y, 0); //Just add spread to last direction

        //Instantiate bullet/projectile
        GameObject currentBullet = Instantiate(bullet, attackPoint.position, Quaternion.identity); //store instantiated bullet in currentBullet
        //Rotate bullet to shoot direction
        currentBullet.transform.forward = directionWithSpread.normalized;

        //Add forces to bullet
        currentBullet.GetComponent<Rigidbody>().AddForce(directionWithSpread.normalized * shootForce, ForceMode.Impulse);
        currentBullet.GetComponent<Rigidbody>().AddForce(fpsCam.transform.up * upwardForce, ForceMode.Impulse);
        if(currentBullet.gameObject.CompareTag("Enemy"))
        {
            Destroy(currentBullet.gameObject, 3);
        }
        if (currentBullet.gameObject.CompareTag("Thing"))
        {
            Destroy(currentBullet.gameObject, 3);
        }


        //Instantiate muzzle flash, if you have one
        if (muzzleFlash != null)
            Instantiate(muzzleFlash, attackPoint.position, Quaternion.identity);

        bulletsLeft--;
        bulletsShot++;

        //Invoke resetShot function (if not already invoked), with your timeBetweenShooting
        if (allowInvoke)
        {
            Invoke("ResetShot", timeBetweenShooting);
            allowInvoke = false;
            

            //Add recoil to player (should only be called once)
            playerRb.AddForce(-directionWithSpread.normalized * recoilForce, ForceMode.Impulse);
        }

        //if more than one bulletsPerTap make sure to repeat shoot function
        if (bulletsShot < bulletsPerTap && bulletsLeft > 0)
            Invoke("Shoot", timeBetweenShots);
    }
    
    private void ResetShot()
    {
        //Allow shooting and invoking again
        readyToShoot = true;
        allowInvoke = true;
    }

    private void Reload()
    {
        reloading = true;
        Invoke("ReloadFinished", reloadTime); //Invoke ReloadFinished function with your reloadTime as delay
    }

    private void ReloadFinished()
    {
        //Fill magazine
        bulletsLeft = magazineSize;
        reloading = false;
    }
}

Answer 1

我有两件事要说。

首先，如果您使用光线投射来查找您击中的位置，则似乎没有必要使用子弹对象，但如果您想要那样做也没关系。

第二个是子弹对象不是瞬间的，所以当你在Shoot()中给子弹加力时，子弹还没有移动。然后你检查它是否与同一帧上的任何东西发生碰撞，也在 Shoot() 中，这仍然意味着子弹还没有移动。我建议将碰撞检测从 Shoot() 方法中移出并移到一个单独的方法中，然后我将在 update() 中调用该方法，与 Input() 分开。

希望对您有所帮助 :D

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