鼠标拖拽围绕某个物体旋转展示

 

CameraController.cs

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

public class CameraController : MonoBehaviour
{
     float MouseX;
     float MouseY;
     //左右旋转速度
     public float routateX;
     //上下旋转速度
     public float routateY;
     //旋转速度
     public float LerpRotateSpeed;
     //目标点距离缩放
     public float distanceScaleTargetValue;
     //当前目标点距离缩放
     public float distanceScaleCurrentValue;
     //最小距离
     public float minDistance;
     //最大距离
     public float maxDistance;
     //限制最小旋转
     public float minRotateYClampValue;
     //限制旋转最大距离
     public float maxRotateYClampValue;
     //摄像机看向的位置
     public Transform targetTrans;
     //镜头缩放差值速度
     public float lerpSpeed;
    
    // Start is called before the first frame update
    void Start()
    {
        MouseX = transform.eulerAngles.y;
        MouseY = transform.eulerAngles.x;
        distanceScaleCurrentValue = distanceScaleTargetValue;
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButton(0))
        {
            MouseX += Input.GetAxis("Mouse X")*routateX;
            //因为摄像机 向下旋转x值增加 向上旋转x减小 所以减去
            MouseY -= Input.GetAxis("Mouse Y")*routateY;
            MouseY = Mathf.Clamp(MouseY, minRotateYClampValue, maxRotateYClampValue);
        }else if (Input.GetAxis("Mouse ScrollWheel") != 0)
        {
            distanceScaleTargetValue += Input.GetAxis("Mouse ScrollWheel");
            distanceScaleTargetValue = Mathf.Clamp(distanceScaleTargetValue, 0, 1);
        }

    }

    private void FixedUpdate()
    {
        //左右转 设置MouseY的值  上下转设置MouseX的值
        Quaternion quaternion = Quaternion.Euler(MouseY,MouseX , 0);
        transform.rotation = Quaternion.Lerp(transform.rotation,quaternion,Time.deltaTime*LerpRotateSpeed);
        Vector3 targetPosition = transform.rotation * new Vector3(0, 0,-GetCurrentPos())+targetTrans.position;
        transform.position = targetPosition;
    }
    
    /// <summary>
    /// 获取当前位置
    /// </summary>
    /// <returns></returns>
    private float GetCurrentPos()
    {
        distanceScaleCurrentValue = Mathf.Lerp(distanceScaleCurrentValue,distanceScaleTargetValue,Time.deltaTime*lerpSpeed);
       return minDistance + (maxDistance - minDistance) * distanceScaleTargetValue;
    }
}

设置数值参考