Rotate object to mouse position

I have this script, that already works
I,m using leanFinger

Code (CSharp):

1.  
2.         var c = Camera.main;
3.         var center = rb.position;
4.         var lastPos = _finger.GetWorldPosition(c.transform.position.y, c);
5.         var lastDelta = Vector3.Distance(center, lastPos);
6.  
7.         float angle = Mathf.Atan2(lastPos.x, lastPos.z) * Mathf.Rad2Deg;
8.         rb.rotation = Quaternion.Euler(new Vector3(0, angle - initialRotation, 0));

The problem is that my object is rotating in absolute angles, so if it is already rotated, there is a unwanted rotation. I want it to take an initialRotation value, but i don't know how.

Thanks

 

Do you want to be using LookAt instead then?

 

With this approach, if the object is already rotated, that rotation will be ignored

 

In that case I have no idea what you are wanting to achieve. Can you clarify?

 

Lets say i have an object rotated 45° in Y axis (this value is not static). I want to rotate it in Y axis by the exact same degrees than _finger from its center. Later, i could just release it, and then rotate it again, like a gear

 

Do you mean you want to drag-rotate the object - something like this?

 

That's exactly what i want, i didn't know that's how it's called this kind of drag. TYVM