How to prevent rotation on the Z axis ?

I'm making an enemy script which enables the enemy object to look towards the player and follow it.
But what is happening here is whenever the player jumps , the enemy tilts itself on the z axis and starts to float in the air.
I tried adding constrains using the rigidbody component but it didn't work.
i tried to add a Quaternion (zClamp) and set it's value to zero but it didn't work either.

Adding gravity disables it to fly upwards but then the bullet impact force creates some weird stuff.

I'm just removing the extra variables, functions and other stuff to just let u focus on the rotation system only.
I'm also removing the definations cuz they are self explanatory.

Code (CSharp):

1.  
2.  
3. public class EnemyControl : MonoBehaviour {
4.  
5.     // Use this for initialization
6.     void Start () {  
7.     }
8.  
9.    
10.     // Update is called once per frame
11.     void Update () {
12.  
13.         if (enemyActive && playerDistance > 1f) {
14.             Quaternion rotation = Quaternion.LookRotation (player.position - transform.position);
15.             transform.rotation = Quaternion.Slerp (transform.rotation, rotation, Time.deltaTime * 10);
16.  
17.             // I tried to use this
18.             Quaternion zClamp = transform.rotation;
19.             zClamp.eulerAngles = new Vector3 (zClamp.eulerAngles.x, zClamp.eulerAngles.y, 0);
20.  
21.  
22.             transform.rotation = zClamp;
23.             transform.Translate (Vector3.forward * speed * Time.deltaTime);
24.         }  
25. }
26.  

Any help would be appreciated !!

 

Try by ignoring the y portion of the look direction.

Code (csharp):

1. Vector3 lookdir = player.position - transform.position;
2. lookdir.y = transform.position.y;
3. // the rest of your code, not worrying about the difference in 'y'
4.  

 

Thanks!!
It Works !!!
I spent days, finding fixes and messing up with quaternions .

Though the answer was SO SIMPLE.

Thanks for the help!

 

Cool, you're welcome.