Raycast 使游戏对象被击中到运行脚本并在游戏对象上运行

Question

我正在为我的大学项目让多个敌人在我的游戏中工作。我有一个带有 ShootGun 脚本的播放器，该脚本对枪进行光线投射并检测击中的物体是否是敌方碰撞器之一（标记为 Enemy_Head、_Torso 和 _Limb）。如果是，它将获取敌人命中的游戏对象和该游戏对象上的 enemyHealth 脚本组件，然后调用该脚本上的 public 函数。目前，当 ShootGun 脚本尝试获取组件/脚本时，它会提示以下错误：

NullReferenceException: 对象引用未设置为对象的实例 ShootGun.gunFire () （位于 Assets/Scripts/Gun/ShootGun.cs:107）

更新的错误代码：

NullReferenceException: 对象引用未设置为对象的实例 ShootGun.gunFire () （位于 Assets/Scripts/Gun/ShootGun.cs:113）

第 113 行 = enHit.enemyShotTorso();

错误出现在 enHit 尝试从 enemyHealth 脚本调用函数的每一行。

以下是我的 ShootGun 脚本中的光线投射：

// Raycasting for bullet projection against obstacles within the world (WIP)
            float gunRayDistance = 50f;

            Ray ray = GetComponent<Camera>().ViewportPointToRay(new Vector3(0.5F, 0.5F, 0));

            // Name what for the raycast collides with (used to reference the target point)
            RaycastHit hit;

            // The actual raycast
            if(Physics.Raycast(ray, out hit, gunRayDistance, 1 << 9) || Physics.Raycast(ray, out hit, gunRayDistance, 1 << 8)) {
                Debug.Log("Bullet Hit");

                EnemyHealth enHit = hit.collider.gameObject.GetComponent<EnemyHealth>();

                // Checking if the raycast (bullet) collided with objects tagged with "Enemy_Head".
                if (hit.collider.gameObject.CompareTag("Enemy_Head")) {
                    Debug.Log ("Headshot!");
                    //hitPoint = hit.collider.gameObject;
                    enHit = hit.collider.gameObject.GetComponent<EnemyHealth>();
                    enHit.enemyShotHead();
                }
                // Checking if the raycast (bullet) collided with objects tagged with "Enemy_Torso".
                if (hit.collider.gameObject.CompareTag("Enemy_Torso")) {
                    Debug.Log ("Body-shot!");
                    //hitPoint = hit.collider.gameObject;
                    enHit = hit.collider.gameObject.GetComponent<EnemyHealth>();
                    enHit.enemyShotTorso();
                }
                // Checking if the raycast (bullet) collided with objects tagged with "Enemy_Limb".
                if (hit.collider.gameObject.CompareTag("Enemy_Limb")) {
                    Debug.Log ("Limb-shot!");
                    enHit = hit.collider.gameObject.GetComponent<EnemyHealth>();
                    enHit.enemyShotLimb();
                }
                // The point of contact with the model is given by the hit.point (to not cause z-fighting issues with layering)
                Vector3 bulletHolePosition = hit.point + hit.normal * 0.01f;
                // Rotation to match where it hits (between the quad vector forward axis and the hit normal)
                Quaternion bulletHoleRotation = Quaternion.FromToRotation(-Vector3.forward, hit.normal);
                GameObject hole = (GameObject)GameObject.Instantiate(bulletHolePrefab, bulletHolePosition, bulletHoleRotation);
                // Destroy the instantiated gameobject of the bulletHole after a delay of 5 seconds.
                Destroy (hole, 5.0f);
            }                                                                                                                    
        }

以下是我的 EnemyHealth 脚本：

public class EnemyHealth : MonoBehaviour {

public float enemyHealth = 100.0f;

// Use this for initialization
void Start () {

}
// Update is called once per frame
void Update () {
    enemyDeath ();
}

public void enemyShotHead() {
    enemyHealth -= 60f;
    Debug.Log (enemyHealth);
}

public void enemyShotTorso() {
    enemyHealth -= 40f;
    Debug.Log (enemyHealth);
}

public void enemyShotLimb() {
    enemyHealth -= 20f;
    Debug.Log (enemyHealth);
}

void enemyDeath() {
    if (enemyHealth <= 0.0f) {
        Debug.Log ("Enemy Killed");
        gameObject.SetActive(false);
    }
}

}

如果您能帮助我找出为什么没有获得参考/设置它们，我们将不胜感激，谢谢。

Answer 1

enHit 可能为空。更换所有

hit.transform.gameObject.GetComponent<EnemyHealth>();

和

hit.collider.gameObject.GetComponent<EnemyHealth>();

您的脚本中大约有 4 个。您想要将 EnemyHealth 脚本附加到射线通过对撞机击中的对象。

编辑：

你还需要改变

hit.transform.CompareTag("Enemy_Head")
hit.transform.CompareTag("Enemy_Torso")
hit.transform.CompareTag("Enemy_Limb")

到

hit.collider.gameObject.CompareTag("Enemy_Head")
hit.collider.gameObject.CompareTag("Enemy_Torso")
hit.collider.gameObject.CompareTag("Enemy_Limb")

这可能无法解决您遇到的当前错误，但这是导致该错误的问题之一。

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