Unity——视角可以调整的第三方相机

新建一个相机作为主相机，然后将此脚本绑定到该相机，就可以实现按住鼠标右键来调整视角的效果。

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

public class camera : MonoBehaviour {

    private const float Y_MIN = 0.0f;
    private const float Y_MAX = 50.0f;



    public Transform lookAt;
    public Transform camTransform;

    private Camera cam;

    private float distance = 3.0f;
    private float currentX = 0.0f;
    private float currentY = 8.7f;
    private float sensivityX = 4.0f;
    private float sensivityY = 1.0f;


    private void Start(){
        camTransform = transform;
        cam = Camera.main;


    }
    private void Update(){
        if (Input.GetMouseButton (1)) {
            currentX += Input.GetAxis ("Mouse X");
            currentY += Input.GetAxis ("Mouse Y");

            currentY = Mathf.Clamp (currentY, Y_MIN, Y_MAX);
        }

        if((Input.GetKey(KeyCode.A))||(Input.GetKey(KeyCode.D))||(Input.GetKey(KeyCode.W))){
            //currentX = lookAt.rotation.x;
            currentX += Input.GetAxis ("Horizontal")* 50.0f * Time.deltaTime*0.8f;   //Auto-Adjust when your object moves or turns
        }


    }
    private void LateUpdate(){
        Vector3 dir = new Vector3 (0, 0, -distance);
        Vector3 offset = new Vector3 (0,2,0);           // it's optional according to your needs.
        Quaternion rotation = Quaternion.Euler (currentY, currentX, 0);
        camTransform.position = lookAt.position + rotation * dir;
        camTransform.LookAt (lookAt.position+offset);
    }


}