Quaternion.LookRotation() not rotating 360 degrees

Question

In my scene I have two cubes one has a tag "Respawn" and another one has the following script attached:

using UnityEngine;
using System.Collections;

public class NewBehaviourScript : MonoBehaviour {

    void Update () {
        transform.rotation = Quaternion.LookRotation (
            GameObject.FindGameObjectWithTag("Respawn").transform.position
        );
    }
}

When I run it and move around my second cube with "Respawn" tag the first cube doesn't always looks at it, at certain point it just starts rotating the opposite side as if it has bounds to it's rotation. What am I doing wrong?

Answer 1

Instead of using Quaternion.LookRotation, use this instead:

transform.LookAt(GameObject.FindGameObjectWithTag("Respawn").transform.position);

This will automatically rotate the object to look at the desired position, which in this case is the position of the Respawn object.

I would also really recommend storing the Respawn object as a variable instead of searching for it every frame.

EDIT: Ignore the stuff above. If you want to be able to use Quaternion.LookRotation so you can, for example, use Lerp or Slerp, you just have to make the position relative as david van brink pointed out, so it will look like this:

Vector3 diff = (GameObject.FindGameObjectWithTag("Respawn").transform.position) - transform.position;
transform.rotation = Quaternion.LookRotation (diff);