Method RequestData

Filters/Extraction/vtkExtractTensorComponents.cxx:81–306

------------------------------------------------------------------------------ Extract data from tensors.

// Extract data from tensors.
//
int vtkExtractTensorComponents::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // get the input and output
  vtkDataSet* input = vtkDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkDataSet* output = vtkDataSet::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkDataArray* inTensors;
  vtkPointData* pd = input->GetPointData();
  vtkPointData* outPD = output->GetPointData();
  vtkDataArray* newScalars = nullptr;
  vtkDataArray* newVectors = nullptr;
  vtkDataArray* newNormals = nullptr;
  vtkDataArray* newTCoords = nullptr;
  vtkIdType numPts;

  // Initialize
  //
  vtkDebugMacro(<< "Extracting tensor components!");

  // First, copy the input to the output as a starting point
  output->CopyStructure(input);

  inTensors = pd->GetTensors();
  numPts = input->GetNumberOfPoints();

  if (!inTensors || numPts < 1)
  {
    vtkErrorMacro(<< "No data to extract!");
    return 1;
  }

  if (!this->ExtractScalars && !this->ExtractVectors && !this->ExtractNormals &&
    !this->ExtractTCoords)
  {
    vtkWarningMacro(<< "No data is being extracted");
  }

  int precisionType;
  switch (this->OutputPrecision)
  {
    case vtkAlgorithm::SINGLE_PRECISION:
      precisionType = VTK_FLOAT;
      break;
    case vtkAlgorithm::DOUBLE_PRECISION:
      precisionType = VTK_DOUBLE;
      break;
    case vtkAlgorithm::DEFAULT_PRECISION:
    default:
      precisionType = inTensors->GetDataType();
      break;
  }

  outPD->CopyAllOn();