def connectedCells(self, index, returnIds=False):
        """Find all cellls connected to an input vertex specified by its index."""
        
        # Find all cells connected to point index
        dpoly = self.polydata()
        cellPointIds = vtk.vtkIdList()
        dpoly.GetPointCells(index, cellPointIds)
    
        ids = vtk.vtkIdTypeArray()
        ids.SetNumberOfComponents(1)
        rids = []
        for k in range(cellPointIds.GetNumberOfIds()):
            cid = cellPointIds.GetId(k)
            ids.InsertNextValue(cid)
            rids.append(int(cid))
        if returnIds:
            return rids
           
        selectionNode = vtk.vtkSelectionNode()
        selectionNode.SetFieldType(vtk.vtkSelectionNode.CELL)
        selectionNode.SetContentType(vtk.vtkSelectionNode.INDICES)
        selectionNode.SetSelectionList(ids)
        selection = vtk.vtkSelection()
        selection.AddNode(selectionNode)
        extractSelection = vtk.vtkExtractSelection()
        extractSelection.SetInputData(0, dpoly)
        extractSelection.SetInputData(1, selection)
        extractSelection.Update()
        gf = vtk.vtkGeometryFilter()
        gf.SetInputData(extractSelection.GetOutput())
        gf.Update()
        return Actor(gf.GetOutput()).lw(1)
Find all cellls connected to an input vertex specified by its index.