Method RequestData

Filters/General/vtkImageDataToPointSet.cxx:42–87

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//------------------------------------------------------------------------------
int vtkImageDataToPointSet::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // Retrieve input and output
  vtkImageData* inData = vtkImageData::GetData(inputVector[0]);
  vtkStructuredGrid* outData = vtkStructuredGrid::GetData(outputVector);

  if (inData == nullptr)
  {
    vtkErrorMacro(<< "Input data is nullptr.");
    return 0;
  }
  if (outData == nullptr)
  {
    vtkErrorMacro(<< "Output data is nullptr.");
    return 0;
  }

  // Copy input point and cell data to output
  outData->GetPointData()->PassData(inData->GetPointData());
  outData->GetCellData()->PassData(inData->GetCellData());

  // Extract points coordinates from the image
  vtkIdType nbPoints = inData->GetNumberOfPoints();
  vtkNew<vtkPoints> points;
  points->SetDataTypeToDouble();
  points->SetNumberOfPoints(nbPoints);
  for (vtkIdType i = 0; i < nbPoints; i++)
  {
    if (this->CheckAbort())
    {
      break;
    }
    double p[3];
    inData->GetPoint(i, p);
    points->SetPoint(i, p);
  }
  outData->SetPoints(points);

  // Copy Extent
  int extent[6];
  inData->GetExtent(extent);
  outData->SetExtent(extent);

  return 1;
}
VTK_ABI_NAMESPACE_END