将Obj文件导入vtk

我正在使用vtk,我想可视化一个objFile,但我不知道怎么做 我想我应该使用ReadObj。但是我应该把ObjFile的名称放在哪里呢。

int main(int argc, char* argv[])
{
 // Parse command line arguments
 if(argc != 2)
 {
 std::cout << "Usage: " << argv[0] << " Filename(.obj)" << std::endl;
 return EXIT_FAILURE;
 }

 std::string filename = argv[1];
 vtkSmartPointer<vtkOBJReader> reader =
 vtkSmartPointer<vtkOBJReader>::New();
  reader->SetFileName(filename.c_str());
 reader->Update();

 // Visualize
 vtkSmartPointer<vtkPolyDataMapper> mapper =
 vtkSmartPointer<vtkPolyDataMapper>::New();
 mapper->SetInputConnection(reader->GetOutputPort());

 vtkSmartPointer<vtkActor> actor =
 vtkSmartPointer<vtkActor>::New();
 actor->SetMapper(mapper);

 vtkSmartPointer<vtkRenderer> renderer =
 vtkSmartPointer<vtkRenderer>::New();
 renderer->AddActor(actor);
 renderer->SetBackground(.3, .6, .3); // Background color green

 vtkSmartPointer<vtkRenderWindow> renderWindow =
  vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
   vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderWindowInteractor->Start();

 return EXIT_SUCCESS;
 }

有人能帮我吗?谢谢