Simulating a Fidget Spinner

Question

Hi, I just started some code that is supposed to simulate a real world fidget spinner. After scribbling the system on paper i thought i had a good solution, and it works fine for some angles except around certain angles where it starts to show some weird behaviour sort of changing direction. I can't figure out what's causing this. Pasting code below.

     if (Input.GetMouseButton(0))
     {
         Debug.Log(transform.rotation.z.ToString());
         Vector3 v_deltaInput = lastInput - Input.mousePosition;
         Vector3 v_unitTheta = -Mathf.Sin(transform.rotation.z) * Vector3.right + Mathf.Cos(transform.rotation.z) * Vector3.up;
        f_projection = Vector3.Dot(v_unitTheta, v_deltaInput);
         transform.Rotate(Vector3.fwd, f_projection);
         lastInput = Input.mousePosition;
     }
     else {
         transform.Rotate(Vector3.fwd, f_projection);
     }
 }

Answer 1

Solved. Perhaps abit hard-coded, but it works in my specific casae. I'll post my solution here incase anyone else runs in to a similiar problem. Basically u pop it on a 2d sprite and spin.

        if (Input.GetMouseButtonDown(0))
         {
             f_projection = 0.0f;
         }
         if (Input.GetMouseButton(0))
         {
             Vector3 v_deltaInput = lastInput - Input.mousePosition;
             Vector3 v_unitX = new Vector3(1, 0, 0);
             Vector3 v_unitY = new Vector3(0, 1, 0);
             f_projectionX = Vector3.Dot(v_unitX, v_deltaInput);
             f_projectionY = Vector3.Dot(v_unitY, v_deltaInput);
             if (Input.mousePosition.y < Screen.height / 2)
             {
                 f_projectionX = -f_projectionX;
             }
             if (Input.mousePosition.x > Screen.width / 2)
             {
                 f_projectionY = -f_projectionY;
             }
             f_rot = f_projectionX + f_projectionY;
             transform.Rotate(Vector3.forward, f_rot);
             lastInput = Input.mousePosition;
         }
         else
         {
             transform.Rotate(Vector3.forward, f_rot);
         }

Simulating a Fidget Spinner

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