ShepardInterpolation

#include <vtkSmartPointer.h>
#include <vtkShepardMethod.h>
#include <vtkContourFilter.h>
#include <vtkProbeFilter.h>

#include <vtkNamedColors.h>
#include <vtkImageData.h>
#include <vtkPointData.h>
#include <vtkBYUReader.h>
#include <vtkOBJReader.h>
#include <vtkPLYReader.h>
#include <vtkPolyDataReader.h>
#include <vtkSTLReader.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkSphereSource.h>
#include <vtksys/SystemTools.hxx>

#include <vtkActor.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>

namespace
{
vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName);
}

int main (int argc, char *argv[])
{
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkPolyData> polyData =
    ReadPolyData(argc > 1 ? argv[1] : "");

  vtkSmartPointer<vtkShepardMethod> interpolator =
    vtkSmartPointer<vtkShepardMethod>::New();
  interpolator->SetInputData(polyData);
  interpolator->SetModelBounds(polyData->GetBounds());
  interpolator->SetSampleDimensions(200, 200, 200);
  interpolator->SetNullValue(-10000);
  interpolator->Update();
  std::cout << "Scalar Range: "
            << interpolator->GetOutput()->GetScalarRange()[0] << ", "
            << interpolator->GetOutput()->GetScalarRange()[1]
            << std::endl;

  vtkSmartPointer<vtkProbeFilter> probe =
    vtkSmartPointer<vtkProbeFilter>::New();
  probe->SetInputData(0, polyData);
  probe->SetInputConnection(1, interpolator->GetOutputPort());

  vtkSmartPointer<vtkContourFilter> contour =
    vtkSmartPointer<vtkContourFilter>::New();
  contour->SetInputConnection(probe->GetOutputPort());
  contour->SetValue(0, 0.0);

  vtkSmartPointer<vtkContourFilter> dataContour =
    vtkSmartPointer<vtkContourFilter>::New();
  dataContour->SetInputData(polyData);
  dataContour->SetValue(0, 0.0);

  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(contour->GetOutputPort());
  mapper->ScalarVisibilityOff();

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
  actor->GetProperty()->SetLineWidth(4.0);

  vtkSmartPointer<vtkPolyDataMapper> dataMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  dataMapper->SetInputConnection(dataContour->GetOutputPort());
  dataMapper->ScalarVisibilityOff();

  vtkSmartPointer<vtkActor> dataActor =
    vtkSmartPointer<vtkActor>::New();
  dataActor->SetMapper(dataMapper);
  dataActor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
  dataActor->GetProperty()->SetLineWidth(4.0);
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->AddActor(dataActor);
  renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

  renderer->ResetCamera();
  renderer->GetActiveCamera()->Azimuth(120);
  renderer->GetActiveCamera()->Elevation(30);
  renderer->GetActiveCamera()->Dolly(1.5);
  renderer->ResetCameraClippingRange();

  renderWindow->SetSize(640, 480);
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

namespace
{
vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName)
{
  vtkSmartPointer<vtkPolyData> polyData;
  std::string extension = vtksys::SystemTools::GetFilenameExtension(std::string(fileName));
  if (extension == ".ply")
  {
    vtkSmartPointer<vtkPLYReader> reader =
      vtkSmartPointer<vtkPLYReader>::New();
    reader->SetFileName (fileName);
    reader->Update();
    polyData = reader->GetOutput();
  }
  else if (extension == ".vtp")
  {
    vtkSmartPointer<vtkXMLPolyDataReader> reader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader->SetFileName (fileName);
    reader->Update();
    polyData = reader->GetOutput();
  }
  else if (extension == ".obj")
  {
    vtkSmartPointer<vtkOBJReader> reader =
      vtkSmartPointer<vtkOBJReader>::New();
    reader->SetFileName (fileName);
    reader->Update();
    polyData = reader->GetOutput();
  }
  else if (extension == ".stl")
  {
    vtkSmartPointer<vtkSTLReader> reader =
      vtkSmartPointer<vtkSTLReader>::New();
    reader->SetFileName (fileName);
    reader->Update();
    polyData = reader->GetOutput();
  }
  else if (extension == ".vtk")
  {
    vtkSmartPointer<vtkPolyDataReader> reader =
      vtkSmartPointer<vtkPolyDataReader>::New();
    reader->SetFileName (fileName);
    reader->Update();
    polyData = reader->GetOutput();
  }
  else if (extension == ".g")
  {
    vtkSmartPointer<vtkBYUReader> reader =
      vtkSmartPointer<vtkBYUReader>::New();
    reader->SetGeometryFileName (fileName);
    reader->Update();
    polyData = reader->GetOutput();
  }
  else
  {
    vtkSmartPointer<vtkSphereSource> source =
      vtkSmartPointer<vtkSphereSource>::New();
    source->Update();
    polyData = source->GetOutput();
  }
  return polyData;
}
}

cmake_minimum_required(VERSION 2.8)

PROJECT(ShepardInterpolation)

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

add_executable(ShepardInterpolation MACOSX_BUNDLE ShepardInterpolation.cxx )

target_link_libraries(ShepardInterpolation ${VTK_LIBRARIES})

cd ShepardInterpolation/build 

cmake ..

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

make

./ShepardInterpolation