Function resample

Filters/ParallelDIY2/vtkAdaptiveResampleToImage.cxx:46–73

Resamples the input dataset to an image dataset spanning the requested boundingbox. This method returns null if a non-empty image cannot be generated for the given input and bounds.

// boundingbox. This method returns null if a non-empty image cannot be
// generated for the given input and bounds.
vtkSmartPointer<vtkImageData> resample(
  const vtkBoundingBox& bbox, vtkDataObject* input, vtkAdaptiveResampleToImage* self)
{
  assert(bbox.IsValid());

  double bds[6];
  bbox.GetBounds(bds);

  vtkNew<vtkPResampleToImage> resampler;
  resampler->SetController(nullptr);
  resampler->SetUseInputBounds(false);
  resampler->SetSamplingDimensions(self->GetSamplingDimensions());
  resampler->SetSamplingBounds(bds);
  resampler->SetInputDataObject(input);
  resampler->Update();
  auto image = resampler->GetOutput();

  auto cellmask = get_mask_array(image->GetCellData());
  auto pointmask = get_mask_array(image->GetPointData());
  if ((static_cast<int>(cellmask->GetRange(0)[0]) & vtkDataSetAttributes::HIDDENCELL) != 0 &&
    (static_cast<int>(pointmask->GetRange(0)[0]) & vtkDataSetAttributes::HIDDENPOINT) != 0)
  {
    // if image has nothing valid, return empty.
    return nullptr;
  }

  return image;
}

vtkSmartPointer<vtkIdList> get_ids(vtkDataSetAttributes* source, unsigned char ghostFlag)
{