Unity3D攝像機跟隨人物移動腳本

直接上代碼，首先在場景裏創建一個可以移動的人物，然後將該腳本掛載在攝像機上即可實現人物跟隨功能。

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

public class FollowPlayer : MonoBehaviour
{
    private Transform player;
    private Vector3 offsetPosition; // 位置偏移
    private bool isRotating = false;

    public float distance = 0;
    public float scrollSpeed = 10;
    public float rotateSpeed = 2;

    // Start is called before the first frame update
    void Start()
    {
        player = GameObject.FindGameObjectWithTag(Tags.player).transform;
        transform.LookAt(player.position);
        offsetPosition = transform.position - player.position;
    }

    // Update is called once per frame
    void Update()
    {
        transform.position = offsetPosition + player.position;
        RotateView();
        ScrollView();
    }

    void ScrollView()
    {
        distance = offsetPosition.magnitude;
        distance += Input.GetAxis("Mouse ScrollWheel") * scrollSpeed;
        distance = Mathf.Clamp(distance, 2, 18);
        offsetPosition = offsetPosition.normalized * distance;
    }

    void RotateView()
    {
        if (Input.GetMouseButtonDown(1))
        {
            isRotating = true;
        }
        if (Input.GetMouseButtonUp(1))
        {
            isRotating = false;
        }
        if (isRotating)
        {
            transform.RotateAround(player.position, player.up, rotateSpeed * Input.GetAxis("Mouse X"));
            Vector3 originalPos = transform.position;
            Quaternion originalRotation = transform.rotation;

            transform.RotateAround(player.position, transform.right, -rotateSpeed * Input.GetAxis("Mouse Y"));
            float x = transform.eulerAngles.x;
            // 當超出範圍之後，將屬性歸位原來的，就是讓旋轉無效
            if (x < 10 || x > 80)
            {
                transform.position = originalPos;
                transform.rotation = originalRotation;
            }
        }
        offsetPosition = transform.position - player.position;
    }
}