Unity 3D Billboard only facing Y to camera

BillboardFacingY.cs

using UnityEngine;
 
 public class BillboardFacingY : MonoBehaviour
 {
     void Update() 
     {
         // look at camera...
         transform.LookAt(Camera.main.transform.position, -Vector3.up);
         // then lock rotation to Y axis only...
         transform.localEulerAngles = new Vector3(0,transform.localEulerAngles.y,0);
     }
 }