WriteVTI
VTKExamples/Cxx/IO/WriteVTI
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Code¶
WriteVTI.cxx
#include <vtkSmartPointer.h> #include <vtkProperty.h> #include <vtkXMLImageDataWriter.h> #include <vtkXMLImageDataReader.h> #include <vtkImageData.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkImageDataGeometryFilter.h> #include <vtkRenderWindow.h> #include <vtkActor.h> #include <vtkPolyDataMapper.h> int main(int argc, char *argv[]) { // Parse command line arguments if(argc != 2) { std::cout << "Required arguments: filename.vti" << std::endl; return EXIT_FAILURE; } std::string filename = argv[1]; vtkSmartPointer<vtkImageData> imageData = vtkSmartPointer<vtkImageData>::New(); imageData->SetDimensions(3,4,5); imageData->AllocateScalars(VTK_DOUBLE, 1); int* dims = imageData->GetDimensions(); // Fill every entry of the image data with "2.0" for (int z = 0; z < dims[2]; z++) { for (int y = 0; y < dims[1]; y++) { for (int x = 0; x < dims[0]; x++) { double* pixel = static_cast<double*>(imageData->GetScalarPointer(x,y,z)); pixel[0] = 2.0; } } } vtkSmartPointer<vtkXMLImageDataWriter> writer = vtkSmartPointer<vtkXMLImageDataWriter>::New(); writer->SetFileName(filename.c_str()); writer->SetInputData(imageData); writer->Write(); // Read the file (to test that it was written correctly) vtkSmartPointer<vtkXMLImageDataReader> reader = vtkSmartPointer<vtkXMLImageDataReader>::New(); reader->SetFileName(filename.c_str()); reader->Update(); // Convert the image to a polydata vtkSmartPointer<vtkImageDataGeometryFilter> imageDataGeometryFilter = vtkSmartPointer<vtkImageDataGeometryFilter>::New(); imageDataGeometryFilter->SetInputConnection(reader->GetOutputPort()); imageDataGeometryFilter->Update(); vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(imageDataGeometryFilter->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); actor->GetProperty()->SetPointSize(3); // Setup rendering vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(actor); renderer->SetBackground(1,1,1); renderer->ResetCamera(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> 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(WriteVTI) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkFiltersGeometry vtkIOXML vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping WriteVTI: ${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(WriteVTI MACOSX_BUNDLE WriteVTI.cxx ) target_link_libraries(WriteVTI PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(WriteVTI MACOSX_BUNDLE WriteVTI.cxx ) target_link_libraries(WriteVTI PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS WriteVTI MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build WriteVTI¶
Click here to download WriteVTI and its CMakeLists.txt file. Once the tarball WriteVTI.tar has been downloaded and extracted,
cd WriteVTI/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:
./WriteVTI
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.