ContourTriangulator

#include <vtkSmartPointer.h>
#include <vtkContourTriangulator.h>
#include <vtkMarchingSquares.h>

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

int main(int argc, char* argv[])
{
  std::string inputFileName;
  if (argc > 1 )
  {
    inputFileName = argv[1];
  }
  int isoValue = 500;
  if (argc > 2)
  {
    isoValue = atoi(argv[2]);
  }

  vtkSmartPointer<vtkPNGReader> reader =
    vtkSmartPointer<vtkPNGReader>::New();
  if (!reader->CanReadFile(inputFileName.c_str()))
  {
    std::cerr << "Error: Could not read " << inputFileName << ".\n";
    return EXIT_FAILURE;
  }
  reader->SetFileName(inputFileName.c_str());
  reader->Update();

  vtkSmartPointer<vtkMarchingSquares> iso =
    vtkSmartPointer<vtkMarchingSquares>::New();
  iso->SetInputConnection(reader->GetOutputPort());
  iso->SetValue(0, isoValue);

  vtkSmartPointer<vtkDataSetMapper> isoMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  isoMapper->SetInputConnection(iso->GetOutputPort());
  isoMapper->ScalarVisibilityOff();

  vtkSmartPointer<vtkActor> isoActor =
    vtkSmartPointer<vtkActor>::New();
  isoActor->SetMapper(isoMapper);
  isoActor->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);

  vtkSmartPointer<vtkContourTriangulator> poly =
    vtkSmartPointer<vtkContourTriangulator>::New();
  poly->SetInputConnection(iso->GetOutputPort());

  vtkSmartPointer<vtkDataSetMapper> polyMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  polyMapper->SetInputConnection(poly->GetOutputPort());
  polyMapper->ScalarVisibilityOff();

  vtkSmartPointer<vtkActor> polyActor =
    vtkSmartPointer<vtkActor>::New();
  polyActor->SetMapper(polyMapper);
  polyActor->GetProperty()->SetColor(1.0000, 0.3882, 0.2784);

  // Standard rendering classes
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->SetMultiSamples(0);
  renWin->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);

  renderer->AddActor(polyActor);
  renderer->AddActor(isoActor);

  // Standard testing code.
  renderer->SetBackground(0.5,0.5,0.5);
  renWin->SetSize(300,300);

  vtkCamera *camera = renderer->GetActiveCamera();
  renderer->ResetCamera();
  camera->Azimuth(180);

  renWin->Render();
  iren->Initialize();
  iren->Start();

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ContourTriangulator)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkFiltersCore
  vtkFiltersGeneral
  vtkIOImage
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping ContourTriangulator: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(ContourTriangulator MACOSX_BUNDLE ContourTriangulator.cxx )
  target_link_libraries(ContourTriangulator PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ContourTriangulator MACOSX_BUNDLE ContourTriangulator.cxx )
  target_link_libraries(ContourTriangulator PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ContourTriangulator
    MODULES ${VTK_LIBRARIES}
    )
endif () 

cd ContourTriangulator/build 

cmake ..

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

make

./ContourTriangulator