Unity3D follow.

using UnityEngine;using System.Collections;public class CameraFollow : MonoBehaviour {    [SerializeField]    private Transform target;    public float smooth = 0.5f;    public bool isSmooth = true;    public float height = 6.0f;    public float distance = 5.0f;    public float distanceRotationX = 30.0f;    private Vector3 nextCameraPosition;    private Quaternion nextCameraRotation;    void Update () {        #region CameraPosition Move.        Vector3 currentV = transform.position;        float resultX = target.position.x;        float resultY = target.position.y + height;        float resultZ = target.position.z - distance;        nextCameraPosition = Vector3.Lerp (currentV, new Vector3 (resultX, resultY, resultZ), smooth * Time.deltaTime);        #endregion        #region CameraRotation Move.        float currentRX = transform.eulerAngles.x;        float currentRY = transform.eulerAngles.y;        float currentRZ = transform.eulerAngles.z;        float resultRotationX = target.eulerAngles.x + distanceRotationX;        float resultRotationY = target.eulerAngles.y;        float resultRotationZ = target.eulerAngles.z;        resultRotationX = Mathf.LerpAngle (currentRX, resultRotationX, smooth * Time.deltaTime);        resultRotationY = Mathf.LerpAngle (currentRY, resultRotationY, smooth * Time.deltaTime);        resultRotationZ = Mathf.LerpAngle (currentRZ, resultRotationZ, smooth * Time.deltaTime);        nextCameraRotation = Quaternion.Euler (resultRotationX, resultRotationY, resultRotationZ);        #endregion        transform.position = nextCameraPosition;        transform.rotation = nextCameraRotation;    }}