Method MergePolyData

Filters/SMP/vtkSMPMergePolyDataHelper.cxx:385–503

}

vtkPolyData* vtkSMPMergePolyDataHelper::MergePolyData(std::vector<InputData>& inputs)
{
  // First merge points

  std::vector<InputData>::iterator itr = inputs.begin();
  std::vector<InputData>::iterator begin = itr;
  std::vector<InputData>::iterator end = inputs.end();

  std::vector<vtkMergePointsData> mpData;
  while (itr != end)
  {
    mpData.emplace_back((*itr).Input, (*itr).Locator);
    ++itr;
  }

  std::vector<vtkIdList*> idMaps;
  vtkPolyData* outPolyData = vtkPolyData::New();

  MergePoints(mpData, idMaps, outPolyData);

  itr = begin;
  vtkIdType vertSize = 0;
  vtkIdType lineSize = 0;
  vtkIdType polySize = 0;
  vtkIdType numVerts = 0;
  vtkIdType numLines = 0;
  vtkIdType numPolys = 0;
  std::vector<vtkMergeCellsData> mcData;
  while (itr != end)
  {
    vertSize += (*itr).Input->GetVerts()->GetNumberOfConnectivityIds();
    lineSize += (*itr).Input->GetLines()->GetNumberOfConnectivityIds();
    polySize += (*itr).Input->GetPolys()->GetNumberOfConnectivityIds();
    numVerts += (*itr).Input->GetVerts()->GetNumberOfCells();
    numLines += (*itr).Input->GetLines()->GetNumberOfCells();
    numPolys += (*itr).Input->GetPolys()->GetNumberOfCells();
    ++itr;
  }

  vtkIdType numOutCells = numVerts + numLines + numPolys;

  vtkCellData* outCellData = (*begin).Input->GetCellData();
  int numCellArrays = outCellData->GetNumberOfArrays();
  for (int i = 0; i < numCellArrays; i++)
  {
    // Resize preserves existing data on reallocation
    outCellData->GetArray(i)->Resize(numOutCells);
    outCellData->GetArray(i)->SetNumberOfTuples(numOutCells);
  }

  // Now merge each cell type. Because vtkPolyData stores each
  // cell type separately, we need to merge them separately.

  if (vertSize > 0)
  {
    vtkNew<vtkCellArray> outVerts;
    outVerts->ResizeExact(numVerts, vertSize);