Method RequestData

Filters/Generic/vtkGenericGeometryFilter.cxx:116–386

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

//------------------------------------------------------------------------------
int vtkGenericGeometryFilter::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
  vtkGenericDataSet* input =
    vtkGenericDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkIdType cellId;
  int i, j;
  vtkIdType numPts = input->GetNumberOfPoints();
  vtkIdType numCells = input->GetNumberOfCells();
  char* cellVis;
  vtkGenericAdaptorCell* cell;
  double x[3] = { 0, 0, 0 };
  vtkIdType ptIds[4];

  vtkIdType ptId;
  int allVisible;
  vtkPointData* outputPD = output->GetPointData();
  vtkCellData* outputCD = output->GetCellData();

  if (numCells == 0)
  {
    vtkErrorMacro(<< "Number of cells is zero, no data to process.");
    return 1;
  }

  vtkDebugMacro(<< "Executing geometry filter");

  if ((!this->CellClipping) && (!this->PointClipping) && (!this->ExtentClipping))
  {
    allVisible = 1;
    cellVis = nullptr;
  }
  else
  {
    allVisible = 0;
    cellVis = new char[numCells];
  }

  vtkGenericCellIterator* cellIt = input->NewCellIterator();
  // Mark cells as being visible or not
  //
  if (!allVisible)
  {
    for (cellIt->Begin(); !cellIt->IsAtEnd(); cellIt->Next())
    {
      cell = cellIt->GetCell();
      cellId = cell->GetId();
      if (this->CellClipping && (cellId < this->CellMinimum || cellId > this->CellMaximum))
      {
        cellVis[cellId] = 0;
      }