使對象檢測光線投射不打它了

Question

我用SendMessage函數以通知是由光線投射命中對象：

 using UnityEngine; 

public class Raycaster : MonoBehaviour { 
    void Update() { 
     RaycastHit hit; 
     if (Physics.Raycast(transform.position, transform.forward, out hit)) 
      if(hit.transform.tag == "MyGameObject"){ 
      hit.transform.SendMessage ("HitByRay"); 
      } 
    } 
} 

而且對象有一個這樣的腳本：

using UnityEngine; 

public class ObjectHit : MonoBehaviour { 
    void HitByRay() { 
     Debug.Log ("I was hit by a Ray"); 
    } 
} 

並且在每一幀中都印有「我被雷擊中」的消息。 現在我需要通知那個遊戲對象，raycast不會再擊中它了。

Answer 1

@Eddge是對的，存儲引用到命中gameobject是要走的路。請檢查下面的代碼：

public class Raycaster : MonoBehaviour 
{ 
    private bool hitting = false; 
    private GameObject hitObject; 

    void Update() 
    { 
     RaycastHit hit; 
     if (Physics.Raycast(transform.position, transform.forward, out hit)) 
     { 
      if(hit.transform.tag == "MyGameObject") 
      { 
       GameObject go = hit.transform.gameobject ; 

       // If no registred hitobject => Entering 
       if(hitObject == null) 
       { 
        go.SendMessage ("OnHitEnter"); 
       } 
       // If hit object is the same as the registered one => Stay 
       else if(hitObject.GetInstanceID() == go.GetInstanceID()) 
       { 
        hitObject.SendMessage("OnHitStay"); 
       } 
       // If new object hit => Exit last + Enter new 
       else 
       { 
        hitObject.SendMessage("OnHitExit"); 
        go.SendMessage ("OnHitEnter"); 
       } 

       hitting = true ; 
       hitObject = go ; 
      } 
     } 
     // No object hit => Exit last one 
     else if(hitting) 
     { 
      hitObject.SendMessage("OnHitExit"); 
      hitting = false ; 
      hitObject = null ; 
     } 
    } 
}