ReadImageData

VTKExamples/Cxx/IO/ReadImageData


Description

This example reads an image data (.vti) file.

Other Languages

See (Python), (CSharp)

Question

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

Code

ReadImageData.cxx

#include <vtkSmartPointer.h>
#include <vtkNamedColors.h>
#include <vtkProperty.h>
#include <vtkDataSetMapper.h>
#include <vtkImageActor.h>
#include <vtkImageViewer2.h>
#include <vtkXMLImageDataReader.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkNamedColors.h>
#include <vtkRenderer.h>

int main(int argc, char* argv[])
{
  // Verify input arguments
  if(argc != 2)
  {
    std::cout << "Usage: " << argv[0]
              << " Filename.vti" << std::endl;
    return EXIT_FAILURE;
  }

  std::string inputFilename = argv[1];

  auto colors = vtkSmartPointer<vtkNamedColors>::New();

  // Read the file
  auto reader = vtkSmartPointer<vtkXMLImageDataReader>::New();
  reader->SetFileName(inputFilename.c_str());
  reader->Update();

  // Visualize
   auto mapper = vtkSmartPointer<vtkDataSetMapper>::New();
  mapper->SetInputConnection(reader->GetOutputPort());

  auto actor = vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetRepresentationToWireframe();
  actor->GetProperty()->SetColor(colors->GetColor3d("DarkSalmon").GetData());

  auto renderer = vtkSmartPointer<vtkRenderer>::New();
  renderer->AddActor(actor);
  renderer->ResetCamera();
  renderer->SetBackground(colors->GetColor3d("Silver").GetData());

  auto renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  auto renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderWindow->Render();
  renderWindowInteractor->Initialize();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ReadImageData)

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

Download and Build ReadImageData

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

cd ReadImageData/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:

./ReadImageData

WINDOWS USERS

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