using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SmoothFollow : MonoBehaviour
{
	public Transform target;               // 設定跟隨的目標
	public float distance = 2.5f;          // 設定跟隨的距離							  
	public float height = 1.0f;            // 設定目標的高度落差
	public float rotationDamping = 1.0f;   // 設定跟隨的轉動阻尼
	public float heightDamping = 1.0f;     // 設定跟隨的高度阻尼

	void LateUpdate()
	{
		if (!target)
			return;

		var wantedRotationAngle = target.eulerAngles.y;   // 計算目前的轉動角度
		var wantedHeight = target.position.y + height;

		var currentRotationAngle = transform.eulerAngles.y;
		var currentHeight = transform.position.y;

		currentRotationAngle = Mathf.LerpAngle(currentRotationAngle, wantedRotationAngle, rotationDamping * Time.deltaTime);
		currentHeight = Mathf.Lerp(currentHeight, wantedHeight, heightDamping * Time.deltaTime);

		var currentRotation = Quaternion.Euler(0, currentRotationAngle, 0);   // Convert the angle into a rotation

		transform.position = target.position;   // Set the position of the camera on the x-z plane to distance meters behind the target
		transform.position -= currentRotation * Vector3.forward * distance;

		transform.position = new Vector3(transform.position.x, currentHeight, transform.position.z);

		transform.LookAt(target);   // 保持注視目標物件
	}
}