鼠标拖动 uv，加入旋转量后不会计算了

[小鱼游戏开发]

如果uv旋转了，如何计算？
如果物体也旋转了，如何计算？

就是说，需要计算 uv 和 物体 的旋转。

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

public class NewBehaviourScript : MonoBehaviour ,IBeginDragHandler,IDragHandler
{
    private static int moveId;

    [SerializeField]
    private float rotateSpeed = 5;

    private Material material;
    private Vector3 oldWorld;
    private Vector2 size;
    private Vector2 scale;
    private Vector3 newWorld;
    private Vector3 offset = Vector3.zero;
    private Vector2 center = new Vector2(0.5f, 0.5f);
    private MeshRenderer meshRenderer;
    private Mesh mesh;

    private void Awake()
    {
        mesh = GetComponent<MeshFilter>().mesh;
         meshRenderer = GetComponent<MeshRenderer>();
        material = meshRenderer.material;
        var boundsSize = meshRenderer.bounds.size;
        size = new Vector2(boundsSize.x,boundsSize.z);//0
        //size = new Vector2(boundsSize.x, boundsSize.y);//x 旋转 -90
        //size = new Vector2(boundsSize.y, boundsSize.z);//z 旋转 -90
        //size = new Vector2(boundsSize.y, boundsSize.z);//z 旋转 90
        //size = new Vector2(boundsSize.x, boundsSize.z);//x 旋转 -180
        RotateUV(rotateSpeed);
    }

    void IBeginDragHandler.OnBeginDrag(PointerEventData eventData)
    {
        oldWorld = eventData.pointerCurrentRaycast.worldPosition;
        scale = material.GetTextureScale("_MainTex");
        moveId = GetInstanceID();
    }
    void IDragHandler.OnDrag(PointerEventData eventData)
    {
        if (moveId != GetInstanceID()) return;
        if (eventData.pointerEnter == null) return;
        newWorld = eventData.pointerCurrentRaycast.worldPosition;
        offset += newWorld - oldWorld;

        material.SetTextureOffset("_MainTex", new Vector2(offset.x* scale.x / size.x, offset.z* scale.y/ size.y));
        //material.SetTextureOffset("_MainTex", new Vector2(offset.x * scale.x / size.x, offset.y * scale.y / size.y));
        //material.SetTextureOffset("_MainTex", new Vector2(-offset.y * scale.x / size.x, offset.z * scale.y / size.y));
        //material.SetTextureOffset("_MainTex", new Vector2(offset.y * scale.x / size.x, offset.z * scale.y / size.y));
        //material.SetTextureOffset("_MainTex", new Vector2(offset.x * scale.x / size.x, -offset.z * scale.y / size.y));

        oldWorld = newWorld;
    }
    
    /// <summary>
    /// 旋转uv
    /// </summary>
    /// <param name="angle"></param>
    public void RotateUV(float angle)
    {
        angle = angle * Mathf.Deg2Rad;
        List<Vector2> uvs = new List<Vector2>(mesh.uv);
        
        for (int i = 0; i < uvs.Count; i++)
        {
            Vector2 uv = uvs[i] - center;
            uv = new Vector2(uv.x * Mathf.Cos(angle) - uv.y * Mathf.Sin(angle),
                              uv.x * Mathf.Sin(angle) + uv.y * Mathf.Cos(angle));
            uv += center;
            uvs[i] = uv;
        }
        mesh.SetUVs(0, uvs);
    }
}