How do I rotate on World Axes with Quaternion.Slerp?

Question

When I rotate my object using this script...

function RotateObject (thisTransform : Transform, degrees : Vector3, seconds : float) { if (rotatingNew) return; rotatingNew = true;

 var startRotation = thisTransform.rotation;
 var endRotation = thisTransform.rotation * Quaternion.Euler(degrees);
 var t = 0.0;
 var rate = 1.0/seconds;
 while (t &lt; 1.0) {
     t += Time.deltaTime * rate;
     thisTransform.rotation = Quaternion.Slerp(startRotation, endRotation, t);
     yield;
 }

 rotatingNew = false;

}

...the object rotates on it's local axes instead of the world axes.

What is a fairly simple way to get this to rotate on World Axes?

Thanks in Advance =)

Answer 1

Best Answer

Answer by Jesse Anders · Jan 09, 2011 at 04:05 AM

Try changing this:

var endRotation = thisTransform.rotation * Quaternion.Euler(degrees);

To this:

var endRotation = Quaternion.Euler(degrees) * thisTransform.rotation;

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Heratitan · Jan 09, 2011 at 04:36 AM 1

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Thank You! This was much simpler than I thought it would be.

toum · May 10, 2013 at 08:58 PM 0

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Could you explain what is the difference between these 2 orders?

Answer 2

After lots of testing, the pins remain in place, but following the combination of rotation is complete, the cube undergoes some rotation along the Y axis that is manipulating the "wheel" of rotation Z or Y. And I can not understand where the problem. Here is the code used ..

 void Update () {
             if(switchControl == true && curTarget != null){
             if(curTarget.name == "RedR" || curTarget.name == "GreenR" || curTarget.name == "BlueR"){
                 Quaternion curPlanchTargetRot = Quaternion.Euler(angles);
                  curPlanche.transform.rotation = Quaternion.Slerp(curPlanche.transform.rotation, curPlanchTargetRot, 10f*Time.deltaTime);    
             }
         }
 
     void onMouseRotateDrag ()
     {
         float posInitX = initMousePosX;//position du curseur au moment du clic
         float posInitY = initMousePosY;
         float posCurX = Input.mousePosition.x;//position du curseur pendant le drag
         float posCurY = Input.mousePosition.y;
         
         differenceX = Mathf.Floor((posCurX-posInitX)/150);
         differenceY = Mathf.Floor((posCurY-posInitY)/150);
         curDifference = differenceX;
         if(Mathf.Abs(curDifference)<Mathf.Abs(differenceY)){//floor() valeur inf et ceil() valeur sup
         //    curDifference = differenceY;
         }
         
         if(curDifference != curApplyDifference){
             if(curTarget.name == "RedR"){ // axe X
                 angles.x = ((-curDifference*90) % 360);
                 curApplyDifference = curDifference;
             }else if(curTarget.name == "GreenR"){ // axe Y
                 angles.y = ((-curDifference*90) % 360);
                 curApplyDifference = curDifference;
             }else if(curTarget.name == "BlueR"){ // axe Z
                 angles.z = ((-curDifference*90) % 360);
                 curApplyDifference = curDifference;
             }
             posInitX = Input.mousePosition.x;
             posInitY = Input.mousePosition.y;
         }
     }

I need some help ... It's been three days I'm looking without much success

How do I rotate on World Axes with Quaternion.Slerp?

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