UNITY - Transform will progressively look at another transform

ProgressiveLookAt.cs

using UnityEngine;
using System.Collections;

public class ProgressiveLookAt : MonoBehaviour
{
  Transform _origin; // itself

  //LOOK AT
  public float lookSpeed = 1f; // with target ref
  public Transform target;
  Vector3 originOrientation = Vector3.forward;

  //READ ONLY STATES
  bool IS_ACTIVE{get{return IS_ACTIVE_LOOK_AT;}}
  bool IS_ACTIVE_LOOK_AT{get{return target != null;}}

  private void Start()
  {
    _origin = transform;
    SetLookAt(target);
  }

  private void LateUpdate()
  {
    // look at ?
    if(IS_ACTIVE_LOOK_AT)
    {
      // lerp
      originOrientation = Vector3.Lerp(originOrientation, target.position, Time.deltaTime * lookSpeed);
      
      // apply
      transform.LookAt(originOrientation);
    }
  }

  public void SetLookAt(Transform _T_newTarget)
  {
    if(_T_newTarget != target)
    {
      // set new target
      target = _T_newTarget;
      
      // reset position look at
      originOrientation = _origin.transform.TransformPoint(Vector3.forward * 10f);
    }
  }

}