ImageDataGeometryFilter

VTKExamples/Cxx/ImageData/ImageDataGeometryFilter


Description

Convert a vtkImageData to a vtkPolyData.

Other Languages

See (Python)

Code

ImageDataGeometryFilter.cxx

#include <vtkSphereSource.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkImageData.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageDataGeometryFilter.h>

int main(int, char *[])
{
  // Create an image
  vtkSmartPointer<vtkImageCanvasSource2D> source1 = 
    vtkSmartPointer<vtkImageCanvasSource2D>::New();
  source1->SetScalarTypeToUnsignedChar();
  source1->SetNumberOfScalarComponents(3);
  source1->SetExtent(0, 100, 0, 100, 0, 0);
  source1->SetDrawColor(0,0,0,1);
  source1->FillBox(0, 100, 0, 100);
  source1->SetDrawColor(255,0,0,1);
  source1->FillBox(10, 20, 10, 20);
  source1->FillBox(40, 50, 20, 30);
  source1->Update();

  // Convert the image to a polydata
  vtkSmartPointer<vtkImageDataGeometryFilter> imageDataGeometryFilter = 
    vtkSmartPointer<vtkImageDataGeometryFilter>::New();
  imageDataGeometryFilter->SetInputConnection(source1->GetOutputPort());
  imageDataGeometryFilter->Update();

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(imageDataGeometryFilter->GetOutputPort());

  vtkSmartPointer<vtkActor> actor = 
      vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  // Visualization
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(1,1,1); // Background color white

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ImageDataGeometryFilter)

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

Download and Build ImageDataGeometryFilter

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

cd ImageDataGeometryFilter/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:

./ImageDataGeometryFilter

WINDOWS USERS

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