Method RequestData

Filters/Geometry/vtkRecoverGeometryWireframe.cxx:128–296

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//-----------------------------------------------------------------------------
int vtkRecoverGeometryWireframe::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkPolyData* input = vtkPolyData::GetData(inputVector[0]);
  vtkPolyData* output = vtkPolyData::GetData(outputVector);

  // If nothing to do, early return
  if (input->GetNumberOfCells() == 0 || input->GetNumberOfPoints() == 0)
  {
    output->ShallowCopy(input);
    return 1;
  }

  if (!input->GetCellData()->HasArray(this->CellIdsAttribute.c_str()))
  {
    vtkWarningMacro("Couldn't find any cell attribute, passing through the input.");
    output->ShallowCopy(input);
    return 1;
  }

  vtkIdTypeArray* faceIds = vtkIdTypeArray::SafeDownCast(
    input->GetCellData()->GetAbstractArray(this->CellIdsAttribute.c_str()));
  if (!faceIds)
  {
    vtkErrorMacro(<< this->CellIdsAttribute.c_str() << " array is not of expected type.");
    return 0;
  }

  // Shallow copy the cell data.  All the cells get copied to output.
  output->GetCellData()->PassData(input->GetCellData());

  // Deep copy the point information and be ready to add points.
  vtkNew<vtkPoints> points;
  points->DeepCopy(input->GetPoints());
  output->SetPoints(points);
  vtkPointData* inputPD = input->GetPointData();
  vtkPointData* outputPD = output->GetPointData();
  outputPD->CopyAllocate(inputPD);
  const vtkIdType numOriginalPoints = points->GetNumberOfPoints();
  for (vtkIdType i = 0; i < numOriginalPoints; ++i)
  {
    outputPD->CopyData(inputPD, i, i);
  }

  // Create an edge flag array.
  vtkNew<vtkUnsignedCharArray> edgeflags;
  edgeflags->SetName("vtkEdgeFlags");
  edgeflags->SetNumberOfComponents(1);
  edgeflags->SetNumberOfTuples(numOriginalPoints);
  auto edgeflagsRange = vtk::DataArrayValueRange<1>(edgeflags);
  std::fill(edgeflagsRange.begin(), edgeflagsRange.end(), NO_EDGE_FLAG);
  outputPD->AddArray(edgeflags);
  outputPD->SetActiveAttribute("vtkEdgeFlags", vtkDataSetAttributes::EDGEFLAG);

  auto tagEdgeFlags = [&edgeflags](vtkCellArray* inputCell, vtkIdType offset = 0)
  {
    auto cellIter = vtk::TakeSmartPointer(inputCell->NewIterator());
    vtkIdType npts;