VirtualFramework/Assets/Scripts/Editor/SetReadWrite.cs

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEngine;

public class SetReadWrite : Editor
{
    [MenuItem("Assets/FBX ReadWrite Enable %&r")]
    public static void EnableFBXReadWrite()
    {
        Object[] selectedObjects = Selection.GetFiltered<Object>(SelectionMode.DeepAssets);
        foreach (Object obj in selectedObjects)
        {
            if (obj != null)
            {
                string path = AssetDatabase.GetAssetPath(obj);
                if (Directory.Exists(path))
                {
                    EnableFBXReadWriteInFolder(path);
                }
                else if (path.EndsWith(".fbx", System.StringComparison.OrdinalIgnoreCase))
                {
                    EnableFBXReadWriteForFile(path);
                }
            }
        }
    }




    public static void EnableFBXReadWriteInFolder(string folderPath)
    {
        string[] files = Directory.GetFiles(folderPath, "*.fbx", SearchOption.AllDirectories);
        foreach (string file in files)
        {
            EnableFBXReadWriteForFile(file);
        }
    }

    public static void EnableFBXReadWriteForFile(string filePath)
    {
        string relativePath = filePath;
        ModelImporter importer = AssetImporter.GetAtPath(relativePath) as ModelImporter;
        if (importer != null)
        {
            importer.isReadable = true;
            AssetDatabase.ImportAsset(relativePath, ImportAssetOptions.ForceUpdate);
            Debug.Log("Enabled Read/Write for: " + relativePath);
        }
    }
}