duck

using UnityEngine;
using System.Collections;

public class LockZ : MonoBehaviour {

    float lockedZ;

    void Start () {
        lockedZ = transform.position.z;
    }

    void FixedUpdate () {
        Vector3 lockedPos = rigidbody.position;
        lockedPos.z = lockedZ;
        rigidbody.position = lockedPos;
        transform.rotation = Quaternion.Euler(0,0,transform.eulerAngles.z);
    }
}