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CutWithCutFunction

vtk-examples/Cxx/VisualizationAlgorithms/CutWithCutFunction


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Question

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Code

CutWithCutFunction.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPlane.h>
#include <vtkPointData.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkNew.h>
#include <vtkXMLPolyDataReader.h>

#include <vtkCutter.h>

int main(int argc, char* argv[])
{
  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " inputFilename(.vtp) [numberOfCuts]"
              << std::endl;
    std::cout << "where: inputFilename is Torso.vtp and";
    std::cout << " numberOfCuts is 20." << std::endl;
    return EXIT_FAILURE;
  }
  std::string inputFilename = argv[1];

  int numberOfCuts = 10;
  if (argc > 2)
  {
    numberOfCuts = atoi(argv[2]);
  }

  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkXMLPolyDataReader> reader;
  reader->SetFileName(inputFilename.c_str());
  reader->Update();

  double bounds[6];
  reader->GetOutput()->GetBounds(bounds);
  std::cout << "Bounds: " << bounds[0] << ", " << bounds[1] << " " << bounds[2]
            << ", " << bounds[3] << " " << bounds[4] << ", " << bounds[5]
            << std::endl;

  vtkNew<vtkPlane> plane;
  plane->SetOrigin((bounds[1] + bounds[0]) / 2.0, (bounds[3] + bounds[2]) / 2.0,
                   bounds[4]);
  plane->SetNormal(0, 0, 1);

  // Create cutter
  double high = plane->EvaluateFunction(
      (bounds[1] + bounds[0]) / 2.0, (bounds[3] + bounds[2]) / 2.0, bounds[5]);

  vtkNew<vtkCutter> cutter;
  cutter->SetInputConnection(reader->GetOutputPort());
  cutter->SetCutFunction(plane);
  cutter->GenerateValues(numberOfCuts, .99, .99 * high);

  vtkNew<vtkPolyDataMapper> cutterMapper;
  cutterMapper->SetInputConnection(cutter->GetOutputPort());
  cutterMapper->ScalarVisibilityOff();

  // Create cut actor
  vtkNew<vtkActor> cutterActor;
  cutterActor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
  cutterActor->GetProperty()->SetLineWidth(2);
  cutterActor->SetMapper(cutterMapper);

  // Create model actor
  vtkNew<vtkPolyDataMapper> modelMapper;
  modelMapper->SetInputConnection(reader->GetOutputPort());
  modelMapper->ScalarVisibilityOff();

  vtkNew<vtkActor> modelActor;
  modelActor->GetProperty()->SetColor(colors->GetColor3d("Flesh").GetData());
  modelActor->SetMapper(modelMapper);

  // Create renderers and add actors of plane and model
  vtkNew<vtkRenderer> renderer;
  renderer->AddActor(cutterActor);
  renderer->AddActor(modelActor);

  // Add renderer to renderwindow and render
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetSize(600, 600);

  vtkNew<vtkRenderWindowInteractor> interactor;
  interactor->SetRenderWindow(renderWindow);

  renderer->SetBackground(colors->GetColor3d("Burlywood").GetData());
  renderer->GetActiveCamera()->SetPosition(0, -1, 0);
  renderer->GetActiveCamera()->SetFocalPoint(0, 0, 0);
  renderer->GetActiveCamera()->SetViewUp(0, 0, 1);
  renderer->GetActiveCamera()->Azimuth(30);
  renderer->GetActiveCamera()->Elevation(30);

  renderer->ResetCamera();
  renderWindow->Render();
  renderWindow->SetWindowName("CutWithCutFunction");

  interactor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(CutWithCutFunction)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersCore
  vtkIOXML
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping CutWithCutFunction: ${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(CutWithCutFunction MACOSX_BUNDLE CutWithCutFunction.cxx )
  target_link_libraries(CutWithCutFunction PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(CutWithCutFunction MACOSX_BUNDLE CutWithCutFunction.cxx )
  target_link_libraries(CutWithCutFunction PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS CutWithCutFunction
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build CutWithCutFunction

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

cd CutWithCutFunction/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:

./CutWithCutFunction

WINDOWS USERS

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