ExtractFaces

VTKExamples/Cxx/Utilities/ExtractFaces

Code

ExtractFaces.cxx

#include <vtkSmartPointer.h>
#include <vtkCellIterator.h>
#include <vtkGenericDataSet.h>
#include <vtkGenericCell.h>
#include <vtkXMLGenericDataObjectReader.h>
#include <vtkPointSet.h>
#include <vtkCellTypes.h>

#include <map>

int main (int argc, char *argv[])
{
  std::map<std::string, int> cellMap;

  for (int arg = 1; arg < argc; ++arg)
  {
    vtkSmartPointer<vtkXMLGenericDataObjectReader> reader =
      vtkSmartPointer<vtkXMLGenericDataObjectReader>::New();
    reader->SetFileName(argv[arg]);
    reader->Update();

    vtkPointSet *pointSet = vtkPointSet::SafeDownCast(reader->GetOutput());
    vtkCellIterator *it = pointSet->NewCellIterator();
    for (it->InitTraversal(); !it->IsDoneWithTraversal(); it->GoToNextCell())
    {
      vtkSmartPointer<vtkGenericCell> cell =
        vtkSmartPointer<vtkGenericCell>::New();
      it->GetCell(cell);
      std::string cellName = vtkCellTypes::GetClassNameFromTypeId(cell->GetCellType());
      if (cellMap.count(cellName) == 0)
      {
        std::cout << "Type: " << cellName
                  << " has " << cell->GetNumberOfFaces() << " faces" << std::endl;
      }
      cellMap[cellName]++;
    }
    it->Delete();
  }

  std::map <std::string, int>::iterator itm = cellMap.begin();
  for (itm = cellMap.begin(); itm != cellMap.end(); ++itm)
  {
    std::cout << itm->first << " occurs " << itm->second << " times" << std::endl;
  }

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ExtractFaces)

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

add_executable(ExtractFaces MACOSX_BUNDLE ExtractFaces.cxx )

target_link_libraries(ExtractFaces ${VTK_LIBRARIES})

Download and Build ExtractFaces

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

cd ExtractFaces/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:

./ExtractFaces

WINDOWS USERS

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