Precisely rotate RigidBody of object to face direction of movement

Hi,

First off here is a demo of what I am trying to do : https://imgur.com/a/BExb2ho

So I am trying to make the cuboid move such that mimics the movements of the mouse. If the mouse is dragged left, the cuboid should move left. Along with that, the face of the cuboid should also follow the direction of movement.

My code is here:

Code (CSharp):

1. void Start () {
2.    // Record where cuboid was initially
3.    cuboidInitialPosition = cuboid.transform.position;
4. }
5.  
6. void FixedUpdate () {
7.    if (mousePressed) {
8.        Vector3 diff = (Input.mousePosition - lastMousePos);
9.        // y mouse movement is actually z in world space
10.        diff.z = diff.y;
11.  
12.        // Some calibration. This works for me.
13.        diff *= (3.6f / Screen.width);
14.  
15.        // If due to physics, the cuboid has flown up, put it back to its original y position
16.        diff.y = cuboidInitialPosition.y - cuboid.transform.position.y;
17.  
18.        cuboid<Rigidbody> ().MovePosition (cuboid.transform.position + diff);
19.        Vector3 velocity = diff / Time.deltaTime;
20.        cuboid.GetComponent<Rigidbody> ().velocity = velocity;
21.   }
22.  
23.    // Rotation part here
24.    // Rotate only if there was any mouse movement...
25.    if (new Vector3 (diff.x, 0.0f, diff.z).magnitude > 0.0f) {
26.        // This was the movement vector from above, with the y movement set as 0
27.        Vector3 angleUpdateDirectionDiff = new Vector3 (diff.x, 0.0f, diff.z);
28.  
29.        // Rotate to the target direction, but cap the rotation to a maximum
30.        // The maximum is 360.0f * diff.magnitude which means allow a max speed of 360 degrees
31.        // per unit distance traveled. I don’t want small mouse movements making drastic direction changes  
32.        cuboid.GetComponent<Rigidbody> ().MoveRotation (Quaternion.RotateTowards (cuboid.transform.rotation, Quaternion.LookRotation (angleUpdateDirectionDiff), 360.0f * diff.magnitude));
33.     }
34. }

My complaint is that the cuboid randomly oscillates in rotation and doesn't stay stable as visible in the video. What is wrong?

Please note that this will be a physics game and so directly changing the object's transform will not work in my favour.

Thank you

 

I realise this is not the right place for this question. Can this thread be removed please?

 

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