camera zoom but translating to target like in google maps (perspective camera)

Hi guys, I was trying to achieve effect when zooming on something beneath mouse, camera locks that position, it always stays beneath that mouse. Camera is not ortho but perspective. here is what i have so far but it doesn't work that good. target isn't locked

Code (CSharp):

1.  
2.     // This is in LateUpdate
3.     RaycastHit hit;
4.     var ray = _camera.ScreenPointToRay (Input.mousePosition);
5.     if (Physics.Raycast (ray, out hit))
6.     {
7.         var offset = new Vector3((target.position.x - hit.point.x), target.position.y, (target.position.z - hit.point.z));
8.         target.Translate(offset * Time.deltaTime * 3f);
9.  
10.     }
11.  

Thanks!

 

why not simply using the ray direction like this:
o far but it doesn't work that good. target isn't locked

Code (CSharp):

1.  
2.     // This is in LateUpdate
3.     const float ZOOM_SPEED = 3f;
4.     RaycastHit hit;
5.     var ray = _camera.ScreenPointToRay (Input.mousePosition);
6.     if (Physics.Raycast (ray, out hit))
7.     {
8.         target.Translate(ZOOM_SPEED * ray.direction * Time.deltaTime);
9.  
10.     }
11.  

 

Lookup "quill18creates", project "mostly civilized".
He does that with the camera on one if the first episodes(i think 2 or 3)