unity 相机鼠标控制移动旋转缩放

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class CameraCtrl02 : MonoBehaviour
{
    private Vector3 newPos;
    private Vector3 newZoom;
    private Quaternion newRota;
 
    [SerializeField] private float panSpeed = 1;
    [SerializeField] private float moveTime = 1;
    [SerializeField] private float rotationAmount = 1;
    [SerializeField] private Vector3 zoomAmount = new Vector3(0,-1,1);
 
    private Vector3 dragStartPos, dragCurrentPos;//鼠标拖拽起始点，鼠标拖拽当前位置
    private Vector3 rotateStart, rotateCurrent;
 
    private Transform cameraTrans;
    private void Start()
    {
        newPos = transform.position;
        newRota = transform.rotation;
 
        cameraTrans = transform.GetChild(0);
        newZoom = cameraTrans.localPosition;
    }
    void Update()
    {
        HandleMovementInput();//通过键盘控制相机
        HandleMouseInput();//通过鼠标控制相机
    }
 
    private void HandleMouseInput()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Plane plane = new Plane(Vector3.up, Vector3.zero);
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            float distance;
            if (plane.Raycast(ray,out distance))
            {
                dragStartPos = ray.GetPoint(distance);
            }
        }
        if (Input.GetMouseButton(0))
        {
            Plane plane = new Plane(Vector3.up, Vector3.zero);
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            float distance;
            if (plane.Raycast(ray, out distance))
            {
                dragCurrentPos = ray.GetPoint(distance);
                Vector3 difference = dragStartPos - dragCurrentPos;
                newPos = transform.position + difference;
            }
        }
        newZoom += Input.mouseScrollDelta.y * zoomAmount;
 
        if (Input.GetMouseButtonDown(2))
            rotateStart = Input.mousePosition;
        if (Input.GetMouseButton(2))
        {
            rotateCurrent = Input.mousePosition;
            Vector3 difference = rotateStart - rotateCurrent;
            rotateStart = rotateCurrent;
            newRota *= Quaternion.Euler(Vector3.up * -difference.x / 20);
        }
    }
 
    private void HandleMovementInput()
    {
        //移动
        if (Input.GetKey(KeyCode.UpArrow) || Input.GetKey(KeyCode.W))
            newPos += transform.forward * panSpeed * Time.deltaTime;
        if (Input.GetKey(KeyCode.DownArrow) || Input.GetKey(KeyCode.S))
            newPos -= transform.forward * panSpeed * Time.deltaTime;
        if (Input.GetKey(KeyCode.RightArrow) || Input.GetKey(KeyCode.D))
            newPos += transform.right * panSpeed * Time.deltaTime;
        if (Input.GetKey(KeyCode.LeftArrow) || Input.GetKey(KeyCode.A))
            newPos -= transform.right * panSpeed * Time.deltaTime;
        transform.position = Vector3.Lerp(transform.position, newPos, moveTime * Time.deltaTime);
        //旋转
        if (Input.GetKey(KeyCode.Q))
            newRota *= Quaternion.Euler(Vector3.up * rotationAmount);
        if (Input.GetKey(KeyCode.E))
            newRota *= Quaternion.Euler(Vector3.down * rotationAmount);
        transform.rotation = Quaternion.Lerp(transform.rotation, newRota, moveTime * Time.deltaTime);
        //缩放
        if (Input.GetKey(KeyCode.R))
            newZoom += zoomAmount;
        if (Input.GetKey(KeyCode.F))
            newZoom -= zoomAmount;
        cameraTrans.localPosition = Vector3.Lerp(cameraTrans.localPosition, newZoom, moveTime * Time.deltaTime);
 
    }
}
参考B站up主 ：BeaverJoe
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版权声明：本文为CSDN博主「Fanstasic」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/Fanstasic/article/details/124865474