Method UnstructuredGridBaseExecute

Filters/Geometry/vtkDataSetSurfaceFilter.cxx:1358–1392

------------------------------------------------------------------------------ Unoptimized version of UnstructuredGridExecute for non vtkUnstructuredGrid instances

//------------------------------------------------------------------------------
// Unoptimized version of UnstructuredGridExecute for non vtkUnstructuredGrid instances
int vtkDataSetSurfaceFilter::UnstructuredGridBaseExecute(
  vtkDataSet* dataSetInput, vtkPolyData* output)
{
  vtkUnstructuredGridBase* input = vtkUnstructuredGridBase::SafeDownCast(dataSetInput);

  // Before we start doing anything interesting, check if we need handle
  // non-linear cells using sub-division.
  bool handleSubdivision = false;
  if (this->NonlinearSubdivisionLevel >= 1)
  {
    // Check to see if the data actually has nonlinear cells.  Handling
    // nonlinear cells adds unnecessary work if we only have linear cells.
    vtkIdType numCells = input->GetNumberOfCells();
    if (input->IsHomogeneous())
    {
      if (numCells >= 1)
      {
        handleSubdivision = !vtkCellTypeUtilities::IsLinear(input->GetCellType(0));
      }
    }
    else
    {
      for (vtkIdType cellId = 0; cellId < numCells; ++cellId)
      {
        if (!vtkCellTypeUtilities::IsLinear(input->GetCellType(cellId)))
        {
          handleSubdivision = true;
          break;
        }
      }
    }
  }

  return this->UnstructuredGridExecuteInternal(input, output, handleSubdivision);
}

//========================================================================
// Tris are now degenerate quads so we only need one hash table.