2 same Scripts w/ GetComponent : one works, one doesn't

Question

I want to make an application for both Standalone version and Android version, in which i'm trying to enable Mesh Renderer of an object attached to its parent object when i press/touch button.

edit: Sorry if i wasn't clear. So this is the case, there is an object called Box A which has child box B. The renderer of box B is disabled at start. When raycast from main camera hit the box A, and then i touch the button (in which the script is attached to), the render of box B should be enabled. That's the idea which runs perfectly in pc-version.

In the pc-version i attach this script in the main camera and it works superb

 public class RayCast : MonoBehaviour {
     public float rayDistance;
     RaycastHit hit;
 
 void Update () {
         Debug.DrawRay (this.transform.position, this.transform.forward * rayDistance,
                        Color.blue);
         RaycastHit hit;
 if (Physics.Raycast (this.transform.position, this.transform.forward, out
                              hit, rayDistance, 1<<8)) {
 
                      
             if (Input.GetButtonDown ("Fire1")){
                 Debug.Log (hit.collider.gameObject.name);
 
              
                 foreach (Transform child in transform){
                  
                     Renderer renderChild = hit.collider.transform.GetChild(0).GetComponent<Renderer>();
                     renderChild.gameObject.GetComponent<Renderer>().enabled = true;
 
                 }
             }
         }
     }
 }

And in the android version I attach at the UI-button a similar script as follow

 public class Funktionen : MonoBehaviour {
     RaycastHit hit;
     public float rayDistance = 5.0f;
 
     private Camera cam;
 void Awake () {
         cam = GameObject.FindGameObjectWithTag ("MainCamera").GetComponent <Camera>();
     }
 
     void Update () {
         Debug.DrawRay (cam.transform.position, cam.transform.forward * rayDistance,
             Color.blue);
         RaycastHit hit;
     }
 
     public void Shooting () {
 
     if (Physics.Raycast (cam.transform.position, cam.transform.forward, out
         hit, rayDistance, 1<<8)) {
 
         foreach (Transform child in transform){
 
            Renderer renderChild = hit.collider.transform.GetChild(0).GetComponent<Renderer>();
            renderChild.gameObject.GetComponent<Renderer>().enabled = true;
             }     
 
             Debug.Log (hit.collider.gameObject.name);
         }
     }
 }

and this script doesn't work as i can't enable Renderer when i touch the button. what strange is, the debug works and it brought me the name of the parent object each time i touch the button.

So what did i miss?

edit: I added this line in the 2nd script and it brings me the name of the child. but why can't i enable the renderer?

 Debug.Log (hit.collider.transform.GetChild(0).name);

Answer 1

Best Answer

Answer by spiningit · Mar 17, 2016 at 09:10 AM

I just found the solution for this problem. I commented out this line and now it works.

 foreach (Transform child in transform){
 }

but I don't know why it caused the GetComponent ().enable not working. can someone maybe explain?

Add comment · Share

Answer 2

Hello! Just got into a problem when I couldn't GetComponent() from Transfrom component of the same object, while it was INACTIVE.

 Transform expandingGroupTransform = this.gameObject.transform.GetChild(1);
         Debug.Log (expandingGroupTransform.gameObject.name);
         GameObject expandingGroup = expandingGroupTransform.GetComponent<GameObject> ();
         Debug.Log (expandingGroup.name);

First Debug.Log was showing the right name of object, while second was not showing anything. I just wrote next thing and it helped:

 Transform expandingGroupTransform = this.gameObject.transform.GetChild(1);
         Debug.Log (expandingGroupTransform.gameObject.name);
         GameObject expandingGroup = expandingGroupTransform.gameObject;
         Debug.Log (expandingGroup.name);

Both Debug.Logs showed correct name. Looks like Transform component already holds GameObject component and we can scip GetComponent() part.

2 same Scripts w/ GetComponent : one works, one doesn't

2 Replies

Your answer

Follow this Question

Related Questions