[vtkusers] Adding data from one vtkCellArray to another

[Artem Babayan]

Hello,

I have to objects of vtkCellArray type: 'result' and 'vtk_cells'. I would
like to add all the data from 'result' to existing data in 'vtk_cell'. At
the moment I do it as brute force copying:

    for(int i = 0; i < result->GetNumberOfCells(); ++i)
    {
      vtkIdType npts;
      vtkIdType *pts;
      result->GetNextCell(npts, pts);
      vtk_cells->InsertNextCell(npts, pts);
    }

but isn't there another, simpler, way?

Best wishes
Artem
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