Question by Sipihr · Jul 16, 2021 at 12:11 PM · rigidbody shake spin localspace

How to shake a spinning object?

Hello everyone, I have an object which I spin it by swipe input and I want to shake it when I've tapped. In my last attempt I could shake it but it doesn't carry the torque so it seems weird. Also I want it to get back in position smoothly, I have tried Lerp and Slerp but can't make it work. Any suggestions?

 public class PlatformController : MonoBehaviour
 {
     [SerializeField]
     private float rotationForce = 10f;
     private Vector3 firstTouch, lastTouch, touchDeltaPosition;
     private Touch touch;
     private bool shaking = false;
 
 
     void Update()
     {
         //If player touches the screen
         if(Input.touchCount > 0)
         {
             //Starting the touch pase
             touch = Input.GetTouch(0);
             switch (touch.phase)
             {
                 case TouchPhase.Began:
                     firstTouch = touch.position;
                     break;
                 case TouchPhase.Ended:
                     lastTouch = touch.position;
                     //Detecting if its tap or swipe
                     if(firstTouch == lastTouch)
                     {
                         //Calling the "not working" shake method
                         ShakeMe();
                         Debug.Log("Tapped");
                     }
                     if (firstTouch != lastTouch)
                     {
                         touchDeltaPosition = firstTouch - lastTouch;
                         GetComponent<Rigidbody>().AddRelativeTorque(0, touchDeltaPosition.x * rotationForce, 0);
                     }
                     break;
             }
         }
 
         if (shaking)
         {
             transform.rotation = Quaternion.Euler(-10, 0, 0);
         }
     }
 
     public void ShakeMe()
     {
         StartCoroutine("ShakeNow");
     }
 
     IEnumerator ShakeNow()
     {
         //Tried different things for return the cylinder to its original position but not succeded
 
         Quaternion originalRotation = transform.rotation;
 
         if (shaking == false)
         {
             shaking = true;
         }
 
         yield return new WaitForSeconds(0.2f);
 
         shaking = false;
         transform.rotation = originalRotation;
         //transform.rotation = Quaternion.Lerp(transform.rotation, originalRotation, Time.deltaTime * 0.1f);
     }
 }

Add comment · Show 2

Vivien_Lynn · Jul 16, 2021 at 04:51 PM 1

Not the opportunity to look deeper into your code right now, but here's a suggestion how I would attempt this: I would create a parent Gameobject, which holds your rotating Gameobject. Then shake that parent gameobject. I would also write a seperate script for the shaking. This makes it easier to debug and makes it possible to use elsewhere as well.

Also, I notice that you use a string to call your Coroutine StartCoroutine("ShakeNow");. This is no good if you ever change the name of your Coroutine, then you lose the reference. Instead call it like a function, like so: StartCoroutine(ShakeNow());