code: def clean(self, tol=None):
          
          poly = self.polydata(False)
          cleanPolyData = vtk.vtkCleanPolyData()
          cleanPolyData.PointMergingOn()
          cleanPolyData.ConvertLinesToPointsOn()
          cleanPolyData.ConvertPolysToLinesOn()
          cleanPolyData.SetInputData(poly)
          if tol:
              cleanPolyData.SetTolerance(tol)
          cleanPolyData.Update()
          return self.updateMesh(cleanPolyData.GetOutput())
docs: Clean actor's polydata. Can also be used to decimate a mesh if ``tol`` is large.
          If ``tol=None`` only removes coincident points.
  
          :param tol: defines how far should be the points from each other in terms of fraction
              of the bounding box length.
  
          .. hint:: |moving_least_squares1D| |moving_least_squares1D.py|_
  
              |recosurface| |recosurface.py|_