On Finger Touch and Drag Rotate 3D Ball

Question

My 3d ball was moving continuously in the forward direction so I want to give X-rotation for this plus game player was dragging ball horizontally on the screen so for this horizontal movement, I want to give Z-rotation.

To achieve my desire, the result I have made ball parent and child game objects, where parent game object only contains collider and rigidbody and this will do the actual physical movement. Another side, child game object only contains mesh renderer, this will do desire rotation.

Following image gives you more idea about my structure: Ball Parent: alt text Ball Child:

For giving rotation to ball mesh as like parent physics ball, I have written this code:

 public class BallMeshRolling : MonoBehaviour
 {
      private Vector3 ballLastPosition;
 
 
 void Start ()
 {
     ballLastPosition = transform.parent.position;
 }
 
 void Update ()
 {
 
     // implementation-1
 //      float speed = Vector3.Distance (transform.parent.position, ballLastPosition) * 30f;
 //      transform.RotateAround (transform.position, Vector3.right, speed);
 
     // implementation-2
 //      Vector3 differenceInPosition = (transform.parent.position - ballLastPosition).normalized;
 //      transform.Rotate (differenceInPosition * 10f);
 
     // implementation-3
     Vector3 differenceInPosition = (transform.parent.position - ballLastPosition).normalized * 50f; 
     Quaternion rotation = Quaternion.LookRotation(differenceInPosition);
     transform.rotation = rotation;
 
     ballLastPosition = transform.parent.position;
 }
 }

But none of the above ways, working properly, so I expect some other better suggestions from your side.

EDIT: Overall I am trying to achieve something like this: Catch up - Ketchapp - Highscore 1274

Answer 1

Answer by bennett_apps · Sep 21, 2018 at 04:24 PM

Wait...you're getting ballLastPosition from transform.parent, but you're not rotating transform.parent...you're rotating transform!

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siddharth3322 · Sep 21, 2018 at 04:46 PM 0

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Because based on parent object movement, I want to give rotation to visible child gameobject. Parent object does not contain mesh renderer so it only gets affected by physics but child object only contains mesh renderer.

I am trying to do something like this: Catch up - $$anonymous$$etchapp - Highscore 1274

bennett_apps · Sep 21, 2018 at 07:52 PM 0

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i see...when u use transform.rotate, it doesn't actually move the object, it only rotates it...are you actually moving either object? cuz there is nothing from this script that moves anything...

Answer 2

Answer by thuong_henry · 6 days ago

how about this way?

   private void Update()
         {
             float x = Input.GetAxis("Mouse X") * speed * Mathf.Deg2Rad;
             float y = Input.GetAxis("Mouse Y") * speed * Mathf.Deg2Rad;
             transform.RotateAround(transform.position, Vector3.up, -x);
             transform.RotateAround(transform.position, Vector3.right, y);
         }

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On Finger Touch and Drag Rotate 3D Ball

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