直接掛載在攝像機上面即可

1.攝像機自由平移

using UnityEngine;
using System.Collections;

/// <summary>
/// 攝像機視角自由移動
/// </summary>
public class CameraFreeMove : MonoBehaviour
{
    public float moveSpeed = 10; // 設置相機移動速度    
    void Update()
    {
        // 當按住鼠標右鍵的時候    
        if (Input.GetMouseButton(0))
        {
            
 
// 獲取鼠標的x和y的值，乘以速度和Time.deltaTime是因為這個可以是運動起來更平滑    
            float h = Input.GetAxis("Mouse X") * moveSpeed * Time.deltaTime;
            float v = Input.GetAxis("Mouse Y") * moveSpeed * Time.deltaTime;
            // 設置當前攝像機移動，y軸並不改變    
            // 需要攝像機按照世界坐標移動，而不是按照它自身的坐標移動，所以加上Spance.World  
            this
 
.transform.Translate(v, 0, -h, Space.World);
        }
    }
}

2.使用鼠標滾輪和雙指觸摸進行縮放

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

public class CameraZoom : MonoBehaviour {

    public float maxDistance;//最大距離
    public float minDistance;//最小距離
    public float scaleSpeed;//
 
縮放速度
    public float mouseSpeed;//縮放速度
    private Touch oldTouch1;  //上次觸摸點1(手指1)  
    private Touch oldTouch2;  //上次觸摸點2(手指2)  

    // Use this for initialization
    void Start () {
        //FairyGUI.GObject a;
        //a.visible = false;
    }
    
    // Update is called once per frame
    void Update () {
        ZoomCamera();
        MouseZoomCamera();
    }

    /// <summary>
    /// 手勢屏幕縮放
    /// </summary>
    private void ZoomCamera()
    {
        //至少得要2個觸摸點 
        if (Input.touchCount < 2)
        {
            return;
        }

        //多點觸摸, 放大縮小  
        Touch newTouch1 = Input.GetTouch(0);
        Touch newTouch2 = Input.GetTouch(1);

        //第2點剛開始接觸屏幕, 只記錄，不做處理  
        if (newTouch2.phase == TouchPhase.Began)
        {
            oldTouch2 = newTouch2;
            oldTouch1 = newTouch1;
            return;
        }

        //計算老的兩點距離和新的兩點間距離，變大要放大模型，變小要縮放模型  
        float oldDistance = Vector2.Distance(oldTouch1.position, oldTouch2.position);
        float newDistance = Vector2.Distance(newTouch1.position, newTouch2.position);

        //兩個距離之差，為正表示放大手勢， 為負表示縮小手勢  
        float offset = newDistance - oldDistance;

        Vector3 originalPos = transform.position;
        Quaternion originalRotation = transform.rotation;
        transform.position += offset * transform.forward * scaleSpeed * Time.deltaTime;

        //臨時判斷值
        float cameraY = transform.position.y;
        if (cameraY < minDistance || cameraY > maxDistance)
        {
            transform.position = originalPos;
            transform.rotation = originalRotation;
        }

        //重新計算
        cameraY = transform.position.y;

        //記住最新的觸摸點，下次使用  
        oldTouch1 = newTouch1;
        oldTouch2 = newTouch2;
    }

    /// <summary>
    /// 鼠標滾輪縮放
    /// </summary>
    private void MouseZoomCamera()
    {
        //獲取滾輪的值
        float mouseScroll = Input.GetAxis("Mouse ScrollWheel");
        if (Mathf.Abs(mouseScroll) > 0)
        {
            //print("hua");
            Vector3 originalPos = transform.position;
            Quaternion originalRotation = transform.rotation;

            transform.position += mouseScroll * transform.forward * mouseSpeed * Time.deltaTime;
            //臨時判斷值
            float cameraY = transform.position.y;
            if (cameraY < minDistance || cameraY > maxDistance)
            {
                transform.position = originalPos;
                transform.rotation = originalRotation;
            }

            //cameraY = transform.position.y;
            //print(distance.magnitude);
        }
    }
}

unity攝像機腳本