How to move parent when child moves?

Question

So if I have an empty gameobject as parent, and a sphere as its child, and then I add force to the sphere, the sphere will move, but the parent will stay in the same position.

I tried just doing this in the update method:

transform.parent.position = transform.position;

But when I click play, the sphere and its parent just fly out of the place. How should I handle this?

Answer 1

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Answer by GrahamReeves · Jun 13, 2014 at 10:10 AM

When you change that parent position, you'll be moving the child. And on the next update, the child has moved more.

child position = parent position + child local offset

so you need to compensate for that, this might be a quick fix

 transform.parent.position = transform.position - transform.localpostiion;

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bluethunder3991 · Jun 02, 2021 at 09:53 AM 0

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https://www.youtube.com/watch?v=NFBEgKd1mSc : This works.

Answer 2

Answer by andrew-lukasik · Jun 13, 2014 at 02:40 PM

Sir, you probably need something like this:

 void Update () {
     Vector3 inputDir = new Vector3(Input.GetAxis("Horizontal"),0f,Input.GetAxis("Vertical"));
     Quaternion rotateInputDir = Quaternion.Euler(0f,0f,0f);//rotate me <3
     rigidbody.AddForce( rotateInputDir * inputDir * 10f );
 }

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How to move parent when child moves?

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