GetMiscPointData

#include <vtkCellData.h>
#include <vtkDoubleArray.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkSmartPointer.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkPolyDataNormals.h>
#include <string>

int main(int argc, char *argv[])
{
  // Parse command line arguments
  if(argc != 3)
  {
    std::cout << "Required arguments: Filename ArrayName" << std::endl;
    return EXIT_FAILURE;
  }

  // Get filename from command line
  std::string filename = argv[1]; //first command line argument

  // Get array name
  std::string arrayName = argv[2]; //second command line argument

  // Read the file
  vtkSmartPointer<vtkXMLPolyDataReader> reader =
    vtkSmartPointer<vtkXMLPolyDataReader>::New();
  std::cout << "Reading " << filename << std::endl;
  reader->SetFileName(filename.c_str());
  reader->Update();

  // Extract the polydata
  vtkSmartPointer<vtkPolyData> polydata =
    reader->GetOutput();

  // Get the number of points in the polydata
  vtkIdType idNumPointsInFile = polydata->GetNumberOfPoints();

  vtkSmartPointer<vtkDoubleArray> array =
    dynamic_cast<vtkDoubleArray*>(polydata->GetPointData()->GetArray(arrayName.c_str()));

  if(array)
  {
      std::cout << "Got array " << arrayName
                << " with " << idNumPointsInFile << " values"
                << std::endl;
    for(int i = 0; i < idNumPointsInFile; i++)
    {
      double value;
      value = array->GetValue(i);
      std::cout << i << ": " << value << std::endl;
    }
  }
  else
  {
    std::cout << "The file " << filename
              << " does not have a PointData array named " << arrayName
              << std::endl;
  }

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(GetMiscPointData)

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

cd GetMiscPointData/build 

cmake ..

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

make

./GetMiscPointData