OnMouseDown() function is not changing gameobject declared outside.

Question

I am using OnMouseDown() like following

   public class Rotateprents : MonoBehaviour
 {    
      GameObject P1;
      GameObject C1;
      GameObject C2;
 
  void OnMouseDown()
     {
         if (transform.name.Contains("Parent"))
         {
             P1 = transform.gameObject;
             C1 = P1.transform.GetChild(0).gameObject;
             C2 = P1.transform.GetChild(P1.transform.childCount - 1).gameObject;
             Debug.Log(C1);
         }
         else if (transform.name.Contains("child"))
         {
             P1 = transform.parent.gameObject;
             C1 = P1.transform.GetChild(0).gameObject;
             C2 = P1.transform.GetChild(P1.transform.childCount - 1).gameObject;
         }
        
     }
  public void rotateobj()
     {
        Debug.Log(C1);
      }
 }

Gameobject C1 is empty in rotateobj(). Why?

Answer 1

Answer by endasil_unity · Dec 29, 2021 at 01:44 PM

C1 can only be null in rotateobj if:

it was assigned null in OnMouseDown
The object C1 points to has been Destroyed
OnMouseDown was called after rotateobj
You're calling rotateobj on another copy of your script than the one you called OnMouseDown on.

We would need more info about your scene setup showing what scripts are attached to what gameobject and how the functions are called to know which one, but verify that the script your setting C1 in is actually the same you're checking it in.

Change Debug.Log(C1); to Debug.Log(C1 + "id " + this.GetInstanceId()); to see if the id is the same in both OnMouseDown and rotate.

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OnMouseDown() function is not changing gameobject declared outside.

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