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HeadSlice

VTKEx/Cxx/VisualizationAlgorithms/HeadSlice

Description¶

This example generates contours on one CT sice through the ehad,

Info

See Figure 6-11a in Chapter 6 the VTK Textbook.

Other languages

See (Python)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code¶

HeadSlice.cxx

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkContourFilter.h>
#include <vtkExtractVOI.h>
#include <vtkMetaImageReader.h>
#include <vtkNamedColors.h>
#include <vtkOutlineFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main (int argc, char *argv[])
{
  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " FullHead.mhd" << std::endl;
    return EXIT_FAILURE;
  }

// Create the RenderWindow, Renderer and both Actors
//
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkRenderer> ren1 =
    vtkSmartPointer<vtkRenderer>::New();

  vtkSmartPointer<vtkRenderWindow> renWin =
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->AddRenderer(ren1);

  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);

// create pipeline
//

  vtkSmartPointer<vtkMetaImageReader> reader =
    vtkSmartPointer<vtkMetaImageReader>::New();
  reader->SetFileName(argv[1]);
  reader->Update();

  vtkSmartPointer<vtkExtractVOI> extractVOI =
      vtkSmartPointer<vtkExtractVOI>::New();
  extractVOI->SetInputConnection(reader->GetOutputPort());
  extractVOI->SetVOI(0, 255, 0, 255, 45, 45);

  vtkSmartPointer<vtkContourFilter> iso =
    vtkSmartPointer<vtkContourFilter>::New();
  iso->SetInputConnection(extractVOI->GetOutputPort());
  iso->GenerateValues(12, 500, 1150);

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

  vtkSmartPointer<vtkActor> isoActor =
    vtkSmartPointer<vtkActor>::New();
  isoActor->SetMapper(isoMapper);
  isoActor->GetProperty()->SetColor(colors->GetColor3d("Wheat").GetData());

  vtkSmartPointer<vtkOutlineFilter> outline =
    vtkSmartPointer<vtkOutlineFilter>::New();
  outline->SetInputConnection(extractVOI->GetOutputPort());

  vtkSmartPointer<vtkPolyDataMapper> outlineMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  outlineMapper->SetInputConnection(outline->GetOutputPort());

  vtkSmartPointer<vtkActor> outlineActor =
    vtkSmartPointer<vtkActor>::New();
  outlineActor->SetMapper(outlineMapper);

// Add the actors to the renderer, set the background and size
//
  ren1->AddActor(outlineActor);
  ren1->AddActor(isoActor);
  ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());
  ren1->ResetCamera();
  ren1->GetActiveCamera()->Dolly(1.5);
  ren1->ResetCameraClippingRange();

  renWin->SetSize(640, 480);

  renWin->Render();
  iren->Start();
  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(HeadSlice)

find_package(VTK COMPONENTS 
  vtkvtkCommonColor
  vtkvtkFiltersCore
  vtkvtkFiltersModeling
  vtkvtkIOImage
  vtkvtkImagingCore
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping HeadSlice: ${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(HeadSlice MACOSX_BUNDLE HeadSlice.cxx )
  target_link_libraries(HeadSlice PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(HeadSlice MACOSX_BUNDLE HeadSlice.cxx )
  target_link_libraries(HeadSlice PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS HeadSlice
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build HeadSlice¶

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

cd HeadSlice/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:

./HeadSlice

WINDOWS USERS

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