Unity:カメラの注目動作(回転移動)/2通りの回転方法を実装

CameraAttention.cs

using System.Collections;
using UnityEngine;

public class CameraAttention : MonoBehaviour
{
    public GameObject destination;
    public GameObject lookAtPos;
    public float moveSpeed;
    public float rotateSpeed;

    // Use this for initialization
    private void Start()
    {
        //アタッチされたオブジェクトがカメラでなければスクリプトを破棄
        if(GetComponent<Camera>() == null)
            Destroy(this);
    }

    // Update is called once per frame
    private void Update()
    {
        //何かキーを押してる間回転移動する
        if(Input.anyKey)
            if(Vector3.Distance(this.transform.position, destination.transform.position) > 0.1f)
            {
                //2通りの回転方法
                //transform.LookAt(Vector3.Lerp(this.transform.position, lookAtPos.transform.position, Mathf.Min(Time.time * rotateSpeed, 1)));
                transform.LookAt(LerpAngle(this.transform.rotation, lookAtPos.transform.rotation, Mathf.Min(Time.time * rotateSpeed, 1)));

                //移動
                transform.Translate((destination.transform.position - this.transform.position) * moveSpeed * Time.deltaTime);
            }
    }

    /// <summary>
    /// クォータニオンを保管して返す
    /// </summary>
    /// <param name="a">origin</param>
    /// <param name="b">destination</param>
    /// <param name="t">[0 ~ 1]</param>
    /// <returns></returns>
    private Vector3 LerpAngle(Quaternion a, Quaternion b, float t)
    {
        var x = Mathf.LerpAngle(a.x, b.x, t);
        var y = Mathf.LerpAngle(a.y, b.y, t);
        var z = Mathf.LerpAngle(a.z, b.z, t);
        return new Vector3(x, y, z);
    }
}