ImageShrink3D

VTKExamples/Cxx/Images/ImageShrink3D


Question

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Code

ImageShrink3D.cxx

#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkImageShrink3D.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageActor.h>
#include <vtkImageEllipsoidSource.h>
#include <vtkImageCast.h>

int main(int, char *[])
{
  // Create an image
  vtkSmartPointer<vtkImageEllipsoidSource> source =
    vtkSmartPointer<vtkImageEllipsoidSource>::New();
  source->SetWholeExtent(0, 20, 0, 20, 0, 0);
  source->SetCenter(10,10,0);
  source->SetRadius(3,4,0);
  source->Update();

  vtkSmartPointer<vtkImageShrink3D> shrinkFilter = 
    vtkSmartPointer<vtkImageShrink3D>::New();
  shrinkFilter->SetInputConnection(source->GetOutputPort());
  shrinkFilter->SetShrinkFactors(2,1,1);
  shrinkFilter->Update();

   // Create actors
  vtkSmartPointer<vtkImageActor> originalActor =
    vtkSmartPointer<vtkImageActor>::New();
  originalActor->GetMapper()->SetInputConnection(
    source->GetOutputPort());

  vtkSmartPointer<vtkImageActor> shrunkActor =
    vtkSmartPointer<vtkImageActor>::New();
  shrunkActor->GetMapper()->SetInputConnection(
    shrinkFilter->GetOutputPort());

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

  // Setup renderers
  vtkSmartPointer<vtkRenderer> originalRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  originalRenderer->SetViewport(originalViewport);
  originalRenderer->AddActor(originalActor);
  originalRenderer->ResetCamera();
  originalRenderer->SetBackground(.4, .5, .6);

  vtkSmartPointer<vtkRenderer> shrunkRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  shrunkRenderer->SetViewport(shrunkViewport);
  shrunkRenderer->AddActor(shrunkActor);
  shrunkRenderer->ResetCamera();
  shrunkRenderer->SetBackground(.4, .5, .7);

  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600, 300);
  renderWindow->AddRenderer(originalRenderer);
  renderWindow->AddRenderer(shrunkRenderer);

  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();

  renderWindowInteractor->SetInteractorStyle(style);

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

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ImageShrink3D)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkImagingCore
  vtkImagingSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping ImageShrink3D: ${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(ImageShrink3D MACOSX_BUNDLE ImageShrink3D.cxx )
  target_link_libraries(ImageShrink3D PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ImageShrink3D MACOSX_BUNDLE ImageShrink3D.cxx )
  target_link_libraries(ImageShrink3D PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ImageShrink3D
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build ImageShrink3D

Click here to download ImageShrink3D and its CMakeLists.txt file. Once the tarball ImageShrink3D.tar has been downloaded and extracted,

cd ImageShrink3D/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:

./ImageShrink3D

WINDOWS USERS

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