Method RequestData

Filters/Geometry/vtkUnstructuredGridGeometryFilter.cxx:845–1399

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkUnstructuredGridGeometryFilter::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // get the input and output. Input may just have the UnstructuredGridBase
  // interface, but output should be an unstructured grid.
  vtkUnstructuredGridBase* input =
    vtkUnstructuredGridBase::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkUnstructuredGrid* output =
    vtkUnstructuredGrid::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  //  this->DebugOn();

  // Input
  vtkIdType numCells = input->GetNumberOfCells();
  if (numCells == 0)
  {
    vtkDebugMacro(<< "Nothing to extract");
    return 1;
  }
  vtkPointData* pd = input->GetPointData();
  vtkCellData* cd = input->GetCellData();
  vtkIdType numPts = input->GetNumberOfPoints();
  vtkPoints* inPts = input->GetPoints();
  vtkSmartPointer<vtkCellIterator> cellIter =
    vtkSmartPointer<vtkCellIterator>::Take(input->NewCellIterator());

  // Output
  vtkPointData* outputPD = output->GetPointData();
  vtkCellData* outputCD = output->GetCellData();
  //  vtkUnsignedCharArray *types=vtkUnsignedCharArray::New();
  //  types->Allocate(numCells);
  //  vtkIdTypeArray *locs=vtkIdTypeArray::New();
  //  locs->Allocate(numCells);
  //  vtkCellArray *conn=vtkCellArray::New();
  //  conn->Allocate(numCells);

  unsigned char* cellGhostLevels = nullptr;
  vtkDataArray* temp = nullptr;
  if (cd != nullptr)
  {
    temp = cd->GetArray(vtkDataSetAttributes::GhostArrayName());
  }
  if (temp != nullptr && temp->GetDataType() == VTK_UNSIGNED_CHAR &&
    temp->GetNumberOfComponents() == 1)
  {
    cellGhostLevels = static_cast<vtkUnsignedCharArray*>(temp)->GetPointer(0);
  }
  else
  {
    vtkDebugMacro("No appropriate ghost levels field available.");
  }

  // Visibility of cells.
  char* cellVis;