Stop child gameobject rotating when parent rotates

I've been searching the interwebs, but just cannot get anything to work.

My gameobject is rotating on the Z plan

Code (CSharp):

1.    
2. if (Input.GetKey(KeyCode.A))
3.     transform.Rotate(NextRotationState(ref mRotationStateIndex).Degrees * Vector3.forward * Time.deltaTime);
4.    
5.    if (Input.GetKey(KeyCode.D))
6.     transform.Rotate(-PreviousRotationState(ref mRotationStateIndex).Degrees * Vector3.forward * Time.deltaTime);
7.  

I added a script on the gameobjects that i don't want to rotate e.g

Code (CSharp):

1.  
2. public class FixRotation : MonoBehaviour
3. {
4. Vector3 mRotation;
5.  
6. void Awake()
7. {
8. mRotation = transform.localEulerAngles;
9. }
10. void Update ()
11. {
12. transform.localEulerAngles = mRotation;
13. }
14.  
15. // To make the object y axis keep pointing up:
16. //void LateUpdate()
17. //{
18. // transform.eulerAngles = Vector3.zero;
19. //}
20.  
21. //Quaternion mrotation;
22.  
23.  
24. // void Awake()
25. // {
26. //  mrotation = transform.localRotation;
27. // }
28.  
29. // void Update()
30. // {
31. // }
32. // void LateUpdate()
33. // {
34. //  transform.localRotation  = mrotation;//new Vector3(0, 0, -mrotation.z);
35. // }
36. }
37.  

but nothing seem to work, might be because I'm not understand the problem

 

You need to counter the rotation of the parent gameObject by an equal and opposite amount. Put this script on the parent gameObject and assign a reference to the child Transform you don't want to rotate in the inspector.

Code (CSharp):

1. public Transform child;
2.  
3. void Update ()
4. {
5. child.transform.rotation = Quaternion.Euler (0.0f, 0.0f, gameObject.transform.rotation.z * -1.0f);
6. }

 

Hi RockyWallbanger,

I tried your idea, but it still does not work, they still rotate with the parent.

I changed your script slightly to the following:

this.transform = Child transform.
this.transform.parent = the Childs parent transform.

Code (CSharp):

1.  
2. void Update()
3.  {
4.   this.transform.rotation = Quaternion.Euler(0.0f, 0.0f, this.transform.parent.rotation.z * -1.0f);
5.  }
6.  

 

Interesting, my script works great for me. If you need the script on the child gameObject, I'd debug the execution of your update callbacks. You need the parent rotation to update first. If I remember correctly, unity executes its event functions in the order they're loaded, which is arbitrary.

 

You have to use LateUpdate i think!!!

 

If you don't NEED it to be a child, you can un-child it and add a simple follow script to it.


public class Follow : MonoBehaviour {

public GameObject following;
[Range(0.0f, 1.0f)]
public float interested; //how interested the follower is in the thing it's following

void LateUpdate () {
transform.position = Vector3.MoveTowards(transform.position, following.transform.position, interested);
}

}

 

public Transform childObject;

Void FixedUpdate()
{
Quaternion savedRotation = childObject.rotation;
// Put parent rotation code here...
childObject.rotation = savedRotation;
}

 

in order that child object would not rotate together with parent, at itself made so
before the rotation of parent, remove child object, and then return it

childObject.parent = null;

// parentObject.rotate +

childObject.transform.SetParent(parentObject.transform, true);

 

Interesting, this seems to work for global rotation but not local.

 

I just wanted to say that I am using this script of yours in version 2021.3.4f1 and it works great! Thank you

 

It's been years since first question asked but If you come from Google and searching for solution situations like this, here is my solution;


in Update:

Code (CSharp):

1.  transform.rotation = Quaternion.Euler(0,0,0);

Or, this is applying by parent gameobject to child gameobject.

Code (CSharp):

1. childGameObject.transform.rotation = Quaternion.Euler(0, 0, 0);

Or maybe; let's say If parent gameobject rotating in Y axis by 50. You just need to rotate child gameobject -50 in Y axis.

Code (CSharp):

1. childGameObject.transform.rotation = Quaternion.Euler(0, -this.transform.rotation.y, 0);

 

@Yavuz_Selim

I cannot even remember what I was doing for this, it's been so long but lets hope that helps others that see this post.

 

Yeah that's why I answered. I hope you've solved easily when you first start this thread lol

 

Hi guys, I tried all of your answer,
the thing here is my parent object is marble and it has a rigidbody.
what I did is I add a fire particles, and place it inside the marble.
it keeps rotating, can someone explain it to me? appreciate the help. thank you!

 

Hey all what would i do if i wanted child to only rotate on the Z axis and not on Y