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WriteVTU

vtk-examples/Cxx/IO/WriteVTU


Description

This example writes a VTU file.

Other languages

See (Java), (CSharp)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

WriteVTU.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkDataSetMapper.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkTetra.h>
#include <vtkUnstructuredGrid.h>
#include <vtkVertexGlyphFilter.h>
#include <vtkXMLUnstructuredGridReader.h>
#include <vtkXMLUnstructuredGridWriter.h>

int main(int argc, char* argv[])
{
  vtkNew<vtkNamedColors> colors;

  // Parse command line arguments
  if (argc != 2)
  {
    std::cout << "Required arguments: OutputFilename.vtu" << std::endl;
    return EXIT_FAILURE;
  }

  std::string filename = argv[1];

  vtkNew<vtkPoints> points;
  points->InsertNextPoint(0, 0, 0);
  points->InsertNextPoint(1, 0, 0);
  points->InsertNextPoint(1, 1, 0);
  points->InsertNextPoint(0, 1, 1);

  vtkNew<vtkTetra> tetra;

  tetra->GetPointIds()->SetId(0, 0);
  tetra->GetPointIds()->SetId(1, 1);
  tetra->GetPointIds()->SetId(2, 2);
  tetra->GetPointIds()->SetId(3, 3);

  vtkNew<vtkCellArray> cellArray;
  cellArray->InsertNextCell(tetra);

  vtkNew<vtkUnstructuredGrid> unstructuredGrid;
  unstructuredGrid->SetPoints(points);
  unstructuredGrid->SetCells(VTK_TETRA, cellArray);

  // Write file
  vtkNew<vtkXMLUnstructuredGridWriter> writer;
  writer->SetFileName(filename.c_str());
  writer->SetInputData(unstructuredGrid);
  writer->Write();

  // Read and display file for verification that it was written correclty
  vtkNew<vtkXMLUnstructuredGridReader> reader;
  reader->SetFileName(filename.c_str());
  reader->Update();

  vtkNew<vtkDataSetMapper> mapper;
  mapper->SetInputConnection(reader->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());

  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("WriteVTU");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("cobalt_green").GetData());

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(WriteVTU)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersGeneral
  vtkIOXML
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping WriteVTU: ${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(WriteVTU MACOSX_BUNDLE WriteVTU.cxx )
  target_link_libraries(WriteVTU PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(WriteVTU MACOSX_BUNDLE WriteVTU.cxx )
  target_link_libraries(WriteVTU PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS WriteVTU
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build WriteVTU

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

cd WriteVTU/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:

./WriteVTU

WINDOWS USERS

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