Quaternion.LookRotation relative the Map

Hi,

I made a simple script for the obj look according to the direction I set.

Code (CSharp):

1.                 float moveHorizontal = player.GetAxis("Horizontal") * speed * Time.deltaTime;
2.                 float moveVertical = player.GetAxis("Vertical") * speed * Time.deltaTime;
3.                 Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
4.                 if (movement != Vector3.zero)
5.                 {
6.                     this.transform.rotation = Quaternion.LookRotation(movement);
7.                 }

But upon reaching a non-flat surface, he does not calculate relative to it. The problem is that I do not know how I make it look relative to the environment.

//EDIT
I took a look, what comes closest to what I want is the Rotate. But...
It keeps spinning because I do not have any controllers, any suggestions?

//EDIT 2
NEW CODE

Code (CSharp):

1.                 float moveHorizontal = player.GetAxis("Horizontal") * speed * Time.deltaTime;
2.                 float moveVertical = player.GetAxis("Vertical") * speed * Time.deltaTime;
3.                 Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
4.                 if (movement != Vector3.zero)
5.                 {
6.                     Quaternion newRotation = Quaternion.LookRotation(movement);
7.                     this.transform.rotation = Quaternion.Slerp(this.transform.rotation, newRotation, Time.deltaTime * 8);
8.                 }

still, it's a bit stuck, but if anyone has any suggestions I accept.