Raycast可以讓gameobject在gameobject上運行腳本和函數

Question

我正在爲我的大學項目爭取多個敵人在我的遊戲中工作。我有一名玩家使用ShootGun腳本來對槍進行光線投射，並檢測對象是否是敵方對手（標有Enemy_Head，_Torso和_Limb）之一。如果是，它將獲得敵方命中的gameobject和該gameobject上的enemyHealth腳本組件，然後將在該腳本上調用公共函數。當前，當ShootGun腳本嘗試獲取組件/腳本時，它會顯示以下錯誤：

NullReferenceException：未將對象引用設置爲對象的實例 ShootGun.gunFire（）（在Assets/Scripts/Gun/ShootGun的.cs：107）

更新的誤差CODE：

的NullReferenceException：未設置爲一個對象 ShootGun.gunFire（）的一個實例（在資產/腳本/噴槍/ ShootGun.cs對象引用：113 ）

Line 113 = enHit.enemyShotTorso（）;

對於enHit嘗試從enemyHealth腳本調用某個函數的每一行，都會顯示該錯誤。

以下是我ShootGun腳本中的光線投射：

// 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腳本：

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); 
    } 
} 

}

，試圖弄清楚爲什麼它不是任何幫助獲得參考/設置他們將不勝感激，謝謝。

Answer 1

enhit很可能爲空。 Repace所有

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

與

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

你有其中約4腳本。您希望將EnemyHealth腳本附加到Ray通過對撞機擊中的對象上。

編輯：

你也需要改變

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") 

這也許不能解決你所得到的電流誤差，但它的問題之一正在導致該錯誤。