WriteVTP

VTKEx/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

Question

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

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 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkIOXML 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.