# WriteVTP

VTKExamples/Cxx/IO/WriteVTP

### Description

In this example, we add 10 points to a polygonal data (polydata) object and write the result to a VTP file.

Other Languages

See (Java), (CSharp)

### Code

WriteVTP.cxx

    #include <vtkCellArray.h>
    #include <vtkPoints.h>
    #include <vtkXMLPolyDataWriter.h>
    #include <vtkPolyData.h>
    #include <vtkSmartPointer.h>

    int main ( int, char *[] )
    {
      // Create 10 points.
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();

      for ( unsigned int i = 0; i < 10; ++i )
      {
        points->InsertNextPoint ( i, i, i );
      }

      // Create a polydata object and add the points to it.
      vtkSmartPointer<vtkPolyData> polydata =
        vtkSmartPointer<vtkPolyData>::New();
      polydata->SetPoints(points);

      // Write the file
      vtkSmartPointer<vtkXMLPolyDataWriter> writer =
        vtkSmartPointer<vtkXMLPolyDataWriter>::New();
      writer->SetFileName("test.vtp");
      writer->SetInputData(polydata);

      // Optional - set the mode. The default is binary.
      //writer->SetDataModeToBinary();
      //writer->SetDataModeToAscii();

      writer->Write();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(WriteVTP)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkIOXML QUIET)
    if (NOT VTK_FOUND)
      message("Skipping WriteVTP: ${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(WriteVTP MACOSX_BUNDLE WriteVTP.cxx )
      target_link_libraries(WriteVTP PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(WriteVTP MACOSX_BUNDLE WriteVTP.cxx )
      target_link_libraries(WriteVTP PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS WriteVTP
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build WriteVTP

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

    cd WriteVTP/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:

    ./WriteVTP

WINDOWS USERS

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