ExtractVOI
VTKExamples/Cxx/ImageData/ExtractVOI
Code¶
ExtractVOI.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkExtractVOI.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageActor.h> #include <vtkImageCast.h> #include <vtkImageMandelbrotSource.h> int main(int, char *[]) { // Create an image vtkSmartPointer<vtkImageMandelbrotSource> source = vtkSmartPointer<vtkImageMandelbrotSource>::New(); source->Update(); int* inputDims = source->GetOutput()->GetDimensions(); std::cout << "Dims: " << " x: " << inputDims[0] << " y: " << inputDims[1] << " z: " << inputDims[2] << std::endl; std::cout << "Number of points: " << source->GetOutput()->GetNumberOfPoints() << std::endl; std::cout << "Number of cells: " << source->GetOutput()->GetNumberOfCells() << std::endl; vtkSmartPointer<vtkExtractVOI> extractVOI = vtkSmartPointer<vtkExtractVOI>::New(); extractVOI->SetInputConnection(source->GetOutputPort()); extractVOI->SetVOI(inputDims[0]/4.,3.*inputDims[0]/4.,inputDims[1]/4.,3.*inputDims[1]/4., 0, 0); extractVOI->Update(); vtkImageData* extracted = extractVOI->GetOutput(); int* extractedDims = extracted->GetDimensions(); std::cout << "Dims: " << " x: " << extractedDims[0] << " y: " << extractedDims[1] << " z: " << extractedDims[2] << std::endl; std::cout << "Number of points: " << extracted->GetNumberOfPoints() << std::endl; std::cout << "Number of cells: " << extracted->GetNumberOfCells() << std::endl; vtkSmartPointer<vtkImageCast> inputCastFilter = vtkSmartPointer<vtkImageCast>::New(); inputCastFilter->SetInputConnection(source->GetOutputPort()); inputCastFilter->SetOutputScalarTypeToUnsignedChar(); inputCastFilter->Update(); vtkSmartPointer<vtkImageCast> extractedCastFilter = vtkSmartPointer<vtkImageCast>::New(); #if VTK_MAJOR_VERSION <= 5 extractedCastFilter->SetInputConnection(extracted->GetProducerPort()); #else extractedCastFilter->SetInputData(extracted); #endif extractedCastFilter->SetOutputScalarTypeToUnsignedChar(); extractedCastFilter->Update(); // Create actors vtkSmartPointer<vtkImageActor> inputActor = vtkSmartPointer<vtkImageActor>::New(); inputActor->GetMapper()->SetInputConnection( inputCastFilter->GetOutputPort()); vtkSmartPointer<vtkImageActor> extractedActor = vtkSmartPointer<vtkImageActor>::New(); extractedActor->GetMapper()->SetInputConnection( extractedCastFilter->GetOutputPort()); // There will be one render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); // And one interactor vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); // Define viewport ranges // (xmin, ymin, xmax, ymax) double leftViewport[4] = {0.0, 0.0, 0.5, 1.0}; double rightViewport[4] = {0.5, 0.0, 1.0, 1.0}; // Setup both renderers vtkSmartPointer<vtkRenderer> leftRenderer = vtkSmartPointer<vtkRenderer>::New(); renderWindow->AddRenderer(leftRenderer); leftRenderer->SetViewport(leftViewport); leftRenderer->SetBackground(.6, .5, .4); vtkSmartPointer<vtkRenderer> rightRenderer = vtkSmartPointer<vtkRenderer>::New(); renderWindow->AddRenderer(rightRenderer); rightRenderer->SetViewport(rightViewport); rightRenderer->SetBackground(.4, .5, .6); leftRenderer->AddActor(inputActor); rightRenderer->AddActor(extractedActor); leftRenderer->ResetCamera(); rightRenderer->ResetCamera(); renderWindow->Render(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ExtractVOI) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ExtractVOI MACOSX_BUNDLE ExtractVOI.cxx) target_link_libraries(ExtractVOI ${VTK_LIBRARIES})
Download and Build ExtractVOI¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ExtractVOI and its CMakeLists.txt file. Once the tarball ExtractVOI.tar has been downloaded and extracted,
cd ExtractVOI/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:
./ExtractVOI
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.