OBJImporter

VTKExamples/Cxx/IO/OBJImporter


Code

OBJImporter.cxx

#include <vtkSmartPointer.h>

#include <vtkOBJImporter.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyDataMapper.h>
#include <vtkPolyDataNormals.h>
#include <vtkCleanPolyData.h>
#include <vtkPolyData.h>
#include <vtkTexture.h>
#include <vtkNamedColors.h>

int main (int argc, char *argv[])
{
  if (argc < 4)
  {
    std::cout << "Usage: " << argv[0]
              << " objfile mtlfile texturepath"
              << std::endl;
    return EXIT_FAILURE;
  }
  vtkSmartPointer<vtkOBJImporter> importer =
    vtkSmartPointer<vtkOBJImporter>::New();
  importer->SetFileName(argv[1]);
  importer->SetFileNameMTL(argv[2]);
  importer->SetTexturePath(argv[3]);

  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();

  renWin->AddRenderer(renderer);
  renderer->SetBackground2 (colors->GetColor3d("Silver").GetData());
  renderer->SetBackground (colors->GetColor3d("Gold").GetData());
  renderer->GradientBackgroundOn();

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

  vtkSmartPointer<vtkActorCollection> actors =
    vtkSmartPointer<vtkActorCollection>::New();
  actors = renderer->GetActors();
  actors->InitTraversal();
  std::cout << "There are " << actors->GetNumberOfItems() << " actors" << std::endl;

  for (vtkIdType a = 0; a < actors->GetNumberOfItems(); ++a)
  {
    std::cout << importer->GetOutputDescription(a) << std::endl;

    vtkActor * actor = actors->GetNextActor();

    // OBJImporter turns texture interpolation off
    if (actor->GetTexture())
    {
      actor->GetTexture()->InterpolateOn();
    }

    vtkPolyData *pd = vtkPolyData::SafeDownCast(actor->GetMapper()->GetInput());
    vtkSmartPointer<vtkCleanPolyData> clean =
      vtkSmartPointer<vtkCleanPolyData>::New();
    clean->SetInputData(pd);
    clean->Update();

    vtkSmartPointer<vtkPolyDataNormals> normals =
      vtkSmartPointer<vtkPolyDataNormals>::New();
    normals->SetInputConnection(clean->GetOutputPort());
    normals->SetInputData(pd);
    normals->SplittingOff();
    normals->Update();
    vtkPolyDataMapper *mapper = vtkPolyDataMapper::SafeDownCast(actor->GetMapper());
    mapper->SetInputData(normals->GetOutput());
  }
  renWin->Render();
  iren->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(OBJImporter)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(OBJImporter MACOSX_BUNDLE OBJImporter.cxx )

target_link_libraries(OBJImporter ${VTK_LIBRARIES})

Download and Build OBJImporter

Click here to download OBJImporter and its CMakeLists.txt file. Once the tarball OBJImporter.tar has been downloaded and extracted,

cd OBJImporter/build 

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./OBJImporter

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.