Method Process

Filters/Geometry/vtkImageDataToUniformGrid.cxx:164–258

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//------------------------------------------------------------------------------
int vtkImageDataToUniformGrid::Process(
  vtkImageData* input, int association, const char* arrayName, vtkUniformGrid* output)
{
  if (vtkUniformGrid* uniformGrid = vtkUniformGrid::SafeDownCast(input))
  {
    output->ShallowCopy(uniformGrid);
  }
  else
  {
    output->ShallowCopy(input);
  }

  vtkDataArray* inScalars = nullptr;
  if (association == vtkDataObject::FIELD_ASSOCIATION_POINTS)
  {
    inScalars = input->GetPointData()->GetArray(arrayName);
  }
  else if (association == vtkDataObject::FIELD_ASSOCIATION_CELLS)
  {
    inScalars = input->GetCellData()->GetArray(arrayName);
  }
  else
  {
    vtkErrorMacro("Wrong association type: " << association);
    return VTK_ERROR;
  }

  if (!inScalars)
  {
    vtkErrorMacro("No scalar data to use for blanking.");
    return VTK_ERROR;
  }
  else if (inScalars->GetNumberOfComponents() != 1)
  {
    vtkErrorMacro("Scalar data must be a single component array.");
    return VTK_ERROR;
  }

  vtkNew<vtkUnsignedCharArray> blankingArray;
  blankingArray->SetNumberOfTuples(inScalars->GetNumberOfTuples());
  blankingArray->SetNumberOfComponents(1);
  blankingArray->FillValue(0);
  blankingArray->SetName(vtkDataSetAttributes::GhostArrayName());

  unsigned char value1;
  unsigned char value2;
  if (association == vtkDataObject::FIELD_ASSOCIATION_CELLS)
  {
    if (this->Reverse)
    {
      value1 = 0;
      value2 = vtkDataSetAttributes::HIDDENCELL;
    }
    else
    {
      value1 = vtkDataSetAttributes::HIDDENCELL;
      value2 = 0;
    }