Tools for checking FBX import/export settings in Unity.

fbx_check.cs

[MenuItem("Assets/Check FBX for Issues")]
private static void CheckFBX()
{
    var paths = Selection.assetGUIDs.Select(s =>
        Path.GetFullPath(Path.Combine(Application.dataPath, "..", AssetDatabase.GUIDToAssetPath(s)))).ToArray();

    var exe = Path.GetFullPath(Path.Combine(Application.dataPath, "..", "..", "Tools", "Hooks",
        "fbx_sanitizer.exe"));

    // Start the child process.
    (string output, string error) = RunCommand(exe, string.Join(" ", paths));

    if (output == "" && error == "")
    {
        output = "No issues were found. All FBX files are valid!";
    }

    error = error.Replace("[ERROR]", "");

    string message = $"The following files were scanned: {string.Join("\n", paths)}\n" +
                     $"{output}\n" +
                     $"{error}";

    EditorUtility.DisplayDialog("FBX Checker", message, "Ok");
}

private static (string stdout, string stderr) RunCommand(string executable, string arguments)
{
    StringBuilder output = new StringBuilder();
    StringBuilder error = new StringBuilder();

    using (AutoResetEvent outputWaitHandle = new AutoResetEvent(false))
    using (AutoResetEvent errorWaitHandle = new AutoResetEvent(false))
    using (Process process = new Process())
    {
        process.StartInfo.FileName = executable;
        process.StartInfo.Arguments = arguments;
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.RedirectStandardOutput = true;
        process.StartInfo.RedirectStandardError = true;
        process.OutputDataReceived += (sender, e) =>
        {
            if (e.Data == null)
            {
                outputWaitHandle.Set();
            }
            else
            {
                output.AppendLine(e.Data);
            }
        };
        process.ErrorDataReceived += (sender, e) =>
        {
            if (e.Data == null)
            {
                errorWaitHandle.Set();
            }
            else
            {
                error.AppendLine(e.Data);
            }
        };

        process.Start();

        process.BeginOutputReadLine();
        process.BeginErrorReadLine();

        process.WaitForExit(int.MaxValue);
        outputWaitHandle.WaitOne(int.MaxValue);
        errorWaitHandle.WaitOne(int.MaxValue);

        // Process completed. Check process.ExitCode here.
        return (output.ToString(), error.ToString());
    }
}