Method RequestData

Filters/GeometryPreview/vtkPointSetStreamer.cxx:42–118

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//------------------------------------------------------------------------------
int vtkPointSetStreamer::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the input
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkPointSet* input = vtkPointSet::GetData(inInfo);

  // get the output
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkPolyData* output = vtkPolyData::GetData(outInfo);

  if (!input || input->GetNumberOfCells() == 0)
  {
    vtkErrorMacro("No input or empty input.");
    return 0;
  }

  // build the locator if needed
  this->PointLocator->SetNumberOfPointsPerBucket(this->NumberOfPointsPerBucket);
  this->PointLocator->SetDataSet(input);
  this->PointLocator->BuildLocator();

  // get the number of buckets
  this->NumberOfBuckets = this->PointLocator->GetNumberOfBuckets();

  // get the points in the bucket
  vtkNew<vtkIdList> pointIds;
  this->PointLocator->GetBucketIds(this->BucketId, pointIds);

  vtkIdType numberOfPointsInBucket = pointIds->GetNumberOfIds();
  if (numberOfPointsInBucket == 0)
  {
    return 1;
  }

  // copy the points and point data
  vtkNew<vtkPoints> points;
  points->SetDataType(input->GetPoints()->GetDataType());
  points->SetNumberOfPoints(numberOfPointsInBucket);

  vtkPointData* inputPD = input->GetPointData();
  vtkPointData* outputPD = output->GetPointData();
  outputPD->CopyAllocate(inputPD, numberOfPointsInBucket);
  outputPD->SetNumberOfTuples(numberOfPointsInBucket);

  double point[3];
  vtkIdType id;
  for (vtkIdType i = 0; i < numberOfPointsInBucket; ++i)
  {
    id = pointIds->GetId(i);
    input->GetPoint(id, point);
    points->SetPoint(i, point);
    outputPD->CopyData(inputPD, id, i);
  }
  output->SetPoints(points);

  // create the original point ids array
  vtkNew<vtkIdTypeArray> originalIds;