Method PrepareApproxData

Common/DataModel/vtkHigherOrderHexahedron.cxx:526–550

\brief Prepare point data for use by linear approximating-elements. * * This copies the point data for the current cell into a new point-data * object so that the point ids and scalar ids can match. */

 * object so that the point ids and scalar ids can match.
 */
void vtkHigherOrderHexahedron::PrepareApproxData(
  vtkPointData* pd, vtkCellData* cd, vtkIdType cellId, vtkDataArray* cellScalars)
{
  this->GetApprox(); // Ensure this->Approx{PD,CD} are non-NULL.
  // this->GetOrder(); // Ensure the order has been updated to match this element.
  this->SetOrderFromCellData(cd, this->Points->GetNumberOfPoints(), cellId);
  vtkIdType npts = this->Points->GetNumberOfPoints();
  vtkIdType nele = this->Order[0] * this->Order[1] * this->Order[2];
  this->ApproxPD->Initialize();
  this->ApproxCD->Initialize();
  this->ApproxPD->CopyAllOn();
  this->ApproxCD->CopyAllOn();
  this->ApproxPD->CopyAllocate(pd, npts);
  this->ApproxCD->CopyAllocate(cd, nele);
  this->CellScalars->SetNumberOfTuples(npts);
  for (int pp = 0; pp < npts; ++pp)
  {
    this->ApproxPD->CopyData(pd, this->PointIds->GetId(pp), pp);
    this->CellScalars->SetValue(pp, cellScalars->GetTuple1(pp));
  }
  for (int ee = 0; ee < nele; ++ee)
  {
    this->ApproxCD->CopyData(cd, cellId, ee);
  }
}

/// A convenience method; see the overloaded variant for more information.
bool vtkHigherOrderHexahedron::SubCellCoordinatesFromId(vtkVector3i& ijk, int subId)