Rotating objects around other without rotating itself

Question

Hi,

I'm having a death battle trying to rotate elements around another without rotating itself.

In a hex board, I'm trying to rotate the elements in the radius of an hex. I can do that with the transform.RotateAround() function, but I want to keep the local rotation of the radius object, so they don't flip.

This is what I have now:

     void Update() {
     
             if (pivot != null && selected != null) {
                 Debug.DrawLine((Vector2)Camera.main.ScreenToWorldPoint(Input.mousePosition), pivot.transform.position);
 
 float pivotMouse = AngleBetweenTwoPoints((Vector2)Camera.main.ScreenToWorldPoint(Input.mousePosition), pivot.transform.position);
                 float pivotSelected = AngleBetweenTwoPoints(selected.transform.position, pivot.transform.position);
                 float difference = pivotMouse - pivotSelected;
 
 Debug.Log ("Angle between pivot and mouse: " + pivotMouse);
                 Debug.Log ("Angle between pivot and selected: " + pivotSelected);
                 Debug.Log ("Diference: " + difference);
 
 for (int i = 0; i < radius.Count; i++) {
     // This is the standard rotate around function, and goes perfectly, but as I said on the question, I don't want to change the local rotation of the object, just move around the pivot square
     radius[i].transform.RotateAround(pivot.transform.position, Vector3.forward, difference);
                 }
             }
         }

Thanks everyone for your help!!

Answer 1

Best Answer

Answer by sajoga · Nov 10, 2015 at 02:43 PM

I just replied you and found the solution, but thanks anyway!

 for (int i = 0; i < radiusGems.Count; i++) {
 //radiusGems[i].transform.RotateAround(pivotSquare.transform.position, Vector3.forward, angle);
 radiusGems[i].transform.position = RotatePointAroundPivot(radiusGems[i].transform.position,
                                                                           pivotSquare.transform.position,
                                                                           Quaternion.Euler(0, 0, angle));
             }
 
 ....
 
 
 public static Vector3 RotatePointAroundPivot(Vector3 point, Vector3 pivot, Quaternion angle) {
         return angle * ( point - pivot) + pivot;
     }

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Botcho · Jul 12, 2018 at 05:27 AM 0

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Have you considered constantly refreshing the Quaternion.identity of the object?

 //Rotate individual gem
 radiusGems[i].transform.RotateAround(Vector3 point, Vector3.pivot, Quaternion angle);
 //Constantly reset radiusGem[i]'s angle to 0,0,0
 radiusGems[i].transform.rotation = Quaternion.identity;

Not sure how efficient it is to constantly reset the rotation.

Rotating objects around other without rotating itself

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