Method InterpolatePoint

Common/DataModel/vtkDataSetAttributesFieldList.cxx:681–722

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//------------------------------------------------------------------------------
void vtkDataSetAttributesFieldList::InterpolatePoint(int inputIndex, vtkDataSetAttributes* input,
  vtkIdList* inputIds, double* weights, vtkDataSetAttributes* output, vtkIdType toId) const
{
  auto& internals = *this->Internals;
  for (auto& pair : internals.Fields)
  {
    auto& fieldInfo = pair.second;
    if (inputIndex < 0 || inputIndex > static_cast<int>(fieldInfo.Location.size()))
    {
      vtkGenericWarningMacro("Incorrect/unknown inputIndex specified : " << inputIndex);
      return;
    }
    else if (fieldInfo.OutputLocation != -1 && fieldInfo.Location[inputIndex] != -1)
    {
      auto fromArray = input->GetAbstractArray(fieldInfo.Location[inputIndex]);
      auto toArray = output->GetAbstractArray(fieldInfo.OutputLocation);

      // check if the destination array needs nearest neighbor interpolation.
      int attrIndex = input->IsArrayAnAttribute(fieldInfo.Location[inputIndex]);
      if (attrIndex != -1 &&
        output->GetCopyAttribute(attrIndex, vtkDataSetAttributes::INTERPOLATE) == 2)
      {
        vtkIdType numIds = inputIds->GetNumberOfIds();
        vtkIdType maxId = inputIds->GetId(0);
        double maxWeight = 0.;
        for (int j = 0; j < numIds; j++)
        {
          if (weights[j] > maxWeight)
          {
            maxWeight = weights[j];
            maxId = inputIds->GetId(j);
          }
        }
        toArray->InsertTuple(toId, maxId, fromArray);
      }
      else
      {
        toArray->InterpolateTuple(toId, inputIds, fromArray, weights);
      }
    }
  }
}

//------------------------------------------------------------------------------
void vtkDataSetAttributesFieldList::TransformData(int inputIndex, vtkFieldData* input,