MyBook/Assets/script/ModelRotationHandler.cs

using UnityEngine;
using UnityEngine.EventSystems;

public class ModelRotationHandler : MonoBehaviour, IPointerDownHandler, IDragHandler
{
    public Transform modelTransform; // 需要旋转的3D模型的父节点
    public float rotationSpeed = 5f; // 旋转速度
    public float zoomSpeed = 20f; // 缩放速度
    public float minZoom = -10f; // 最小缩放距离
    public float maxZoom = -2f;  // 最大缩放距离

    public GameObject GameObject_r_y;
    public GameObject GameObject_r_x;
    public GameObject Camera_pos_z; // 需要缩放的相机对象

    private Vector2 lastMousePosition; // 记录上一次鼠标位置

    public void OnPointerDown(PointerEventData eventData)
    {
        lastMousePosition = eventData.position; // 记录鼠标初始位置
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (modelTransform == null) return;

        Vector2 delta = eventData.position - lastMousePosition; // 计算鼠标移动量
        float rotationX = -delta.y * rotationSpeed * Time.deltaTime;
        float rotationY = delta.x * rotationSpeed * Time.deltaTime;

        GameObject_r_x.transform.Rotate(Vector3.up, rotationY, Space.World); // 水平旋转（左右拖动）
        GameObject_r_y.transform.Rotate(Vector3.right, rotationX, Space.World); // 垂直旋转（上下拖动）

        lastMousePosition = eventData.position; // 更新鼠标位置
    }

    void Update()
    {
        if (modelTransform == null) return;

        GameObject_r_y.transform.position = modelTransform.position;
        

        if (Camera_pos_z == null) return;

        float scroll = Input.GetAxis("Mouse ScrollWheel");
        if (scroll != 0f)
        {
            Vector3 targetPos = Camera_pos_z.transform.localPosition;
            targetPos.z += scroll * zoomSpeed;
            targetPos.z = Mathf.Clamp(targetPos.z, minZoom, maxZoom);

            // 使用 Lerp 进行平滑缩放
            Camera_pos_z.transform.localPosition = Vector3.Lerp(Camera_pos_z.transform.localPosition, targetPos, Time.deltaTime * 20f);
        }
    }
}