PointCellIds

VTKExamples/Cxx/PolyData/PointCellIds

Code

PointCellIds.cxx

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkIdFilter.h>
#include <vtkIdTypeArray.h>
#include <vtkPointData.h>
#include <vtkCellData.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();

  std::cout << "There are " << sphereSource->GetOutput()->GetNumberOfPoints() << " points." << std::endl;
  std::cout << "There are " << sphereSource->GetOutput()->GetNumberOfCells() << " cells." << std::endl;

  vtkSmartPointer<vtkIdFilter> idFilter =
    vtkSmartPointer<vtkIdFilter>::New();
  idFilter->SetInputConnection(sphereSource->GetOutputPort());
  idFilter->SetIdsArrayName("ids");
  idFilter->Update();

  std::cout << "point arrays: " << std::endl;
  for(vtkIdType i = 0; i < idFilter->GetOutput()->GetPointData()->GetNumberOfArrays(); i++)
  {
    std::cout << idFilter->GetOutput()->GetPointData()->GetArrayName(i) << std::endl;
  }

  std::cout << "cell arrays: " << std::endl;
  for(vtkIdType i = 0; i < idFilter->GetOutput()->GetCellData()->GetNumberOfArrays(); i++)
  {
    std::cout << idFilter->GetOutput()->GetCellData()->GetArrayName(i) << std::endl;
  }

  vtkIdTypeArray* pointIds = vtkIdTypeArray::SafeDownCast(idFilter->GetOutput()->GetPointData()->GetArray("ids"));
  std::cout << "There are " << pointIds->GetNumberOfTuples() << " point ids" << std::endl;

  vtkIdTypeArray* cellIds = vtkIdTypeArray::SafeDownCast(idFilter->GetOutput()->GetCellData()->GetArray("ids"));
  std::cout << "There are " << cellIds->GetNumberOfTuples() << " point ids" << std::endl;

  return EXIT_SUCCESS;

}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(PointCellIds)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(PointCellIds MACOSX_BUNDLE PointCellIds.cxx )

target_link_libraries(PointCellIds ${VTK_LIBRARIES})

Download and Build PointCellIds

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

cd PointCellIds/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:

./PointCellIds

WINDOWS USERS

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