Method RequestData

Filters/General/vtkInterpolateDataSetAttributes.cxx:52–205

Interpolate the data

// Interpolate the data
int vtkInterpolateDataSetAttributes::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the info object
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

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

  vtkIdType numPts, numCells, i;
  int numInputs = this->GetNumberOfInputConnections(0);
  int lowDS, highDS;
  vtkDataSet *ds, *ds2;
  vtkPointData* outputPD = output->GetPointData();
  vtkCellData* outputCD = output->GetCellData();
  vtkPointData *inputPD, *input2PD;
  vtkCellData *inputCD, *input2CD;
  double t;

  if (numInputs < 2)
  {
    vtkErrorMacro(<< "Need at least two inputs to interpolate!");
    return 1;
  }

  vtkDebugMacro(<< "Interpolating data...");

  // Check input and determine between which data sets the interpolation
  // is to occur.
  if (this->T > static_cast<double>(numInputs))
  {
    vtkErrorMacro(<< "Bad interpolation parameter");
    return 1;
  }

  lowDS = static_cast<int>(this->T);
  if (lowDS >= (numInputs - 1))
  {
    lowDS = numInputs - 2;
  }

  highDS = lowDS + 1;
  t = this->T - static_cast<double>(lowDS);
  t = std::min(t, 1.0);

  vtkInformation* dsInfo = inputVector[0]->GetInformationObject(lowDS);
  vtkInformation* ds2Info = inputVector[0]->GetInformationObject(highDS);
  ds = vtkDataSet::SafeDownCast(dsInfo->Get(vtkDataObject::DATA_OBJECT()));
  ds2 = vtkDataSet::SafeDownCast(ds2Info->Get(vtkDataObject::DATA_OBJECT()));

  numPts = ds->GetNumberOfPoints();
  numCells = ds->GetNumberOfCells();

  if (numPts != ds2->GetNumberOfPoints() || numCells != ds2->GetNumberOfCells())
  {
    vtkErrorMacro(<< "Data sets not consistent!");
    return 1;
  }