ImageRange3D

#include <vtkImageActor.h>
#include <vtkImageCast.h>
#include <vtkImageMapper3D.h>
#include <vtkImageRange3D.h>
#include <vtkImageReader2.h>
#include <vtkImageReader2Factory.h>
#include <vtkInteractorStyleImage.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>

int main(int argc, char* argv[])
{
  vtkNew<vtkNamedColors> colors;

  // Parse input arguments.
  if (argc != 2)
  {
    std::cout << "Required parameters: Filename.jpg e.g. Gourds2.jpg"
              << std::endl;
    return EXIT_FAILURE;
  }

  // Read the image
  vtkNew<vtkImageReader2Factory> readerFactory;
  vtkSmartPointer<vtkImageReader2> reader;
  reader.TakeReference(readerFactory->CreateImageReader2(argv[1]));
  reader->SetFileName(argv[1]);

  // Create actors
  vtkNew<vtkImageActor> originalActor;
  originalActor->GetMapper()->SetInputConnection(reader->GetOutputPort());

  vtkNew<vtkImageRange3D> rangeFilter;
  rangeFilter->SetInputConnection(reader->GetOutputPort());
  rangeFilter->SetKernelSize(5, 5, 5);
  rangeFilter->Update();

  vtkNew<vtkImageCast> rangeCastFilter;
  rangeCastFilter->SetInputConnection(rangeFilter->GetOutputPort());
  rangeCastFilter->SetOutputScalarTypeToUnsignedChar();
  rangeCastFilter->Update();

  vtkNew<vtkImageActor> rangeActor;
  rangeActor->GetMapper()->SetInputConnection(rangeCastFilter->GetOutputPort());

  // Define viewport ranges.
  // (xmin, ymin, xmax, ymax)
  double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double rangeViewport[4] = {0.5, 0.0, 1.0, 1.0};

  // Setup renderers
  vtkNew<vtkRenderer> originalRenderer;
  originalRenderer->SetViewport(originalViewport);
  originalRenderer->AddActor(originalActor);
  originalRenderer->ResetCamera();
  originalRenderer->SetBackground(
      colors->GetColor3d("CornflowerBlue").GetData());

  vtkNew<vtkRenderer> rangeRenderer;
  rangeRenderer->SetViewport(rangeViewport);
  rangeRenderer->AddActor(rangeActor);
  rangeRenderer->ResetCamera();
  rangeRenderer->SetBackground(colors->GetColor3d("SteelBlue").GetData());

  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetSize(600, 300);
  renderWindow->AddRenderer(originalRenderer);
  renderWindow->AddRenderer(rangeRenderer);
  renderWindow->SetWindowName("ImageRange3D");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  vtkNew<vtkInteractorStyleImage> style;

  renderWindowInteractor->SetInteractorStyle(style);

  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderWindow->Render();
  renderWindowInteractor->Initialize();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(ImageRange3D)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ImageRange3D: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(ImageRange3D MACOSX_BUNDLE ImageRange3D.cxx )
  target_link_libraries(ImageRange3D PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS ImageRange3D
  MODULES ${VTK_LIBRARIES}
)

cd ImageRange3D/build

cmake ..

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

make

./ImageRange3D