Method RequestData

Filters/Geometry/vtkMarkBoundaryFilter.cxx:956–1065

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

//----------------------------------------------------------------------------
int vtkMarkBoundaryFilter::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
  vtkDataSet* input = vtkDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkDataSet* output = vtkDataSet::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  // The output structure is the same as the input. Input point and cell data is
  // copied through as well.
  output->CopyStructure(input);
  output->GetPointData()->PassData(input->GetPointData());
  output->GetCellData()->PassData(input->GetCellData());

  // Create the required output arrays indicating boundary points, cells,
  // mand optional faces.
  vtkIdType numPts = input->GetNumberOfPoints();
  vtkIdType numCells = input->GetNumberOfCells();

  vtkNew<vtkUnsignedCharArray> bPoints;
  bPoints->SetNumberOfTuples(numPts);
  bPoints->SetName(this->BoundaryPointsName);
  output->GetPointData()->AddArray(bPoints);

  vtkNew<vtkUnsignedCharArray> bCells;
  bCells->SetNumberOfTuples(numCells);
  bCells->SetName(this->BoundaryCellsName);
  output->GetCellData()->AddArray(bCells);

  vtkSmartPointer<vtkIdTypeArray> bFaces;
  if (this->GenerateBoundaryFaces)
  {
    bFaces.TakeReference(vtkIdTypeArray::New());
    bFaces->SetNumberOfTuples(numCells);
    bFaces->SetName(this->BoundaryFacesName);
    output->GetCellData()->AddArray(bFaces);
  }

  // Initially, nothing is marked on the boundary
  InitializeBoundaryArrays(bPoints, bCells, bFaces);
  unsigned char* bPtsPtr = bPoints->GetPointer(0);
  unsigned char* bCellsPtr = bCells->GetPointer(0);
  vtkIdType* bFacesPtr = (bFaces.Get() != nullptr ? bFaces->GetPointer(0) : nullptr);

  if (numCells == 0)
  {
    return 1;
  }

  // Grab ghost levels if needed
  unsigned char* cellGhosts = nullptr;
  vtkDataArray* temp = nullptr;
  temp = input->GetCellData()->GetArray(vtkDataSetAttributes::GhostArrayName());
  if ((!temp) || (temp->GetDataType() != VTK_UNSIGNED_CHAR) || (temp->GetNumberOfComponents() != 1))
  {