En mi proyecto de Unity, me gustaría usar la clase FastObjImporter que se encuentra en Internet para poner obj en la escena. ¿Tengo que crear un GameObject vacío y asignarle un obj procesado?

Prueba con un objeto de juego vacío:

GameObject go = new GameObject("obj");
myMesh = FastObjImporter.Instance.ImportFile(objPath);
Instantiate(myMesh, Vector3.zero, Quaternion.identity);
go.AddComponent<MeshRenderer>();
go.GetComponent<MeshFilter>().mesh = myMesh;

Anteriormente lo intenté de esta manera pero tampoco funcionó:

GameObject go;
myMesh = FastObjImporter.Instance.ImportFile(objPath);
Instantiate(myMesh, Vector3.zero, Quaternion.identity);
go.GetComponent<MeshFilter>().mesh = myMesh;

¿Alguien podría explicar lo que estoy haciendo mal?

CÓDIGO:

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;
using System.IO;

/// <summary>
/// Sample
/// </summary>
public class DriveTest : MonoBehaviour
{
    //public static readonly string REQUIRED_MIME = "image/jpeg";
    //public string filePath;
    public string objPath;
    bool initInProgress = false;
    GoogleDrive drive;
    public string url;
    List<GoogleDrive.File> remoteObjFiles;

    public Mesh myMesh;
    public GameObject go;

    /* ---------------------------------------------------------------------------------------------------------------------------------- */
    void Start()
    {
        objPath = Application.persistentDataPath + "/testObj.obj";
        StartCoroutine(ImportObj());
        go = new GameObject("obj");
    }

    /* ---------------------------------------------------------------------------------------------------------------------------------- */

    void Update()
    {

        if (Input.GetKey(KeyCode.Escape))
            Application.Quit();
    }

    /* ---------------------------------------------------------------------------------------------------------------------------------- */

    IEnumerator ImportObj()
    {
        initInProgress = true;

        drive = new GoogleDrive();
        var driveInit = drive.Initialize();
        while (driveInit.MoveNext())
            yield return null;

        initInProgress = false;

        for (;;)
        {
            ( SEARCHING AND SETTING DOWNLOAD FOLDER IN GDRIVE )

            var download = drive.DownloadFile(remoteObjFiles[0]);
            yield return StartCoroutine(download);
            var data = GoogleDrive.GetResult<byte[]>(download);

            if (File.Exists(objPath))
            {
                File.Delete(objPath);
                File.WriteAllBytes(objPath, data);
            }
            else
                File.WriteAllBytes(objPath, data);

            Debug.Log("Obj: " + remoteObjFiles[0].ToString());

            if (File.Exists(objPath))
            {
                Debug.Log("Loading OBJ from the device");
                myMesh = FastObjImporter.Instance.ImportFile(objPath);
                Debug.Log("Obj imported...");
                Instantiate(myMesh, Vector3.zero, Quaternion.identity);
                go.AddComponent<MeshRenderer>();
                go.GetComponent<MeshFilter>().mesh = myMesh;
            }
            break;
        }
}

Saludos