parent child rotation

Question

Hi,

I have a gameobject which is parent of other gameobject,so i have parent and child objects.

I want to be able to rotate the parent object but to leave child object to always look up direction.

When i rotate the parent object i can see its euler value change,but the child object is always (0,0,0).

How can i make the child object to look some vector( let say up ) constantly?

Answer 1

Answer by runevision · Oct 08, 2010 at 10:28 AM

You can place a script on the child object that makes it be aligned the way you want.

// To keep a constant global rotation:
var myGlobalRotation : Vector3;
function Update () {
    transform.rotation = myGlobalRotation;
}

Or:

// To make the object z axis look at some point:
var myLookAtTarget : Vector3;
function Update () {
    transform.LookAt(myLookAtTarget);
}

Or:

// To make the object y axis keep pointing up:
function Update () {
    transform.up = Vector3.up;
}

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Easy · Oct 08, 2010 at 11:03 AM 0

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Hi, I have tried transform.up = vector3.up but my child object is skewed. All other method change my object to face to some unwanted direction and i dont know how to fix it. what i miss here?

runevision ♦♦ · Oct 11, 2010 at 10:01 AM 0

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You probably have a non-uniform scaling on the parent transform then. You should avoid that as it creates all kinds of problems.

Answer 2

Answer by Bretfort · Nov 30, 2012 at 08:58 PM

you need to remember your camera's rotation:

     void Start () {
         fixedRot = gameObject.transform.rotation;
     }
     
     // Update is called once per frame
     void Update () {
         gameObject.transform.up = fixedRot;
     }

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parent child rotation

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