[vtkusers] vtkOBJImporter can't read the whole mesh of an obj file including several parts

[maskjp]

Hi,everyone!

I use vtkOBJImporter to read an obj file including several parts (the file
is from shapenet  https://www.shapenet.org/ <https://www.shapenet.org/>  
models.zip <http://vtk.1045678.n5.nabble.com/file/t342591/models.zip>  ).
But it can only read part of it. I also try to use paraview, but get the
same results. The following is the code:(its's the example code on
website.). 

Thanks.


  vtkNew<vtkOBJImporter> importer;

  importer->SetFileName(filenameOBJ.data());
  importer->SetFileNameMTL(filenameMTL.data());
  importer->SetTexturePath(texturePath.data());

  vtkNew<vtkRenderer> ren;
  vtkNew<vtkRenderWindow> renWin;
  vtkNew<vtkRenderWindowInteractor> iren;

  renWin->AddRenderer(ren);
  iren->SetRenderWindow(renWin);
  importer->SetRenderWindow(renWin);
  importer->Update();

  renWin->SetSize(800,600);
  ren->SetBackground(0.4,0.5,0.6);
  ren->ResetCamera();
  renWin->Render();



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