Skip to content

CopyAllArrays

vtk-examples/Cxx/PolyData/CopyAllArrays

Question

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

Code

CopyAllArrays.cxx

#include <vtkDoubleArray.h>
#include <vtkFloatArray.h>
#include <vtkIntArray.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>

namespace {
void ManualMethod(vtkPolyData* input);
void AutomaticMethod(vtkPolyData* input);
} // namespace

int main(int, char*[])
{
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->Update();

  vtkPolyData* polydata = sphereSource->GetOutput();

  vtkNew<vtkDoubleArray> doubles;
  doubles->SetName("Doubles");
  doubles->SetNumberOfTuples(polydata->GetNumberOfPoints());

  polydata->GetPointData()->AddArray(doubles);

  vtkNew<vtkIntArray> ints;
  ints->SetName("Ints");
  ints->SetNumberOfTuples(polydata->GetNumberOfPoints());

  polydata->GetPointData()->AddArray(ints);

  ManualMethod(polydata);
  AutomaticMethod(polydata);

  return EXIT_SUCCESS;
}

namespace {
void ManualMethod(vtkPolyData* input)
{
  unsigned int numberOfArrays = input->GetPointData()->GetNumberOfArrays();
  std::cout << "There are " << numberOfArrays << " arrays." << std::endl;

  vtkNew<vtkPolyData> newPolyData;

  for (unsigned int i = 0; i < numberOfArrays; i++)
  {
    std::cout << "array " << i << ":" << std::endl;
    std::cout << "name: " << input->GetPointData()->GetArrayName(i)
              << std::endl;
    std::cout << "type: " << input->GetPointData()->GetArray(i)->GetDataType()
              << std::endl;
    std::cout << std::endl;

    newPolyData->GetPointData()->AddArray(input->GetPointData()->GetArray(i));
  }

  std::cout << "new polydata: " << std::endl;

  for (unsigned int i = 0; i < numberOfArrays; i++)
  {
    std::cout << "array " << i << ":" << std::endl;
    std::cout << "name: " << newPolyData->GetPointData()->GetArrayName(i)
              << std::endl;
    std::cout << "type: "
              << newPolyData->GetPointData()->GetArray(i)->GetDataType()
              << std::endl;
    std::cout << std::endl;
  }
}

void AutomaticMethod(vtkPolyData* input)
{
  unsigned int numberOfArrays = input->GetPointData()->GetNumberOfArrays();
  std::cout << "There are " << numberOfArrays << " arrays." << std::endl;

  vtkNew<vtkPolyData> newPolyData;

  newPolyData->GetPointData()->PassData(input->GetPointData());

  for (unsigned int i = 0; i < numberOfArrays; i++)
  {
    std::cout << "array " << i << ":" << std::endl;
    std::cout << "name: " << input->GetPointData()->GetArrayName(i)
              << std::endl;
    std::cout << "type: " << input->GetPointData()->GetArray(i)->GetDataType()
              << std::endl;
    std::cout << std::endl;
  }

  std::cout << "new polydata: " << std::endl;

  for (unsigned int i = 0; i < numberOfArrays; i++)
  {
    std::cout << "array " << i << ":" << std::endl;
    std::cout << "name: " << newPolyData->GetPointData()->GetArrayName(i)
              << std::endl;
    std::cout << "type: "
              << newPolyData->GetPointData()->GetArray(i)->GetDataType()
              << std::endl;
    std::cout << std::endl;
  }
}
} // namespace

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(CopyAllArrays)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  QUIET
)

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

Download and Build CopyAllArrays

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

cd CopyAllArrays/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:

./CopyAllArrays

WINDOWS USERS

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