def boundaries(self, boundaryEdges=True, featureAngle=65, nonManifoldEdges=True):
        """
        Return an ``Actor`` that shows the boundary lines of an input mesh.
        
        :param bool boundaryEdges: Turn on/off the extraction of boundary edges.
        :param float featureAngle: Specify the feature angle for extracting feature edges.
        :param bool nonManifoldEdges: Turn on/off the extraction of non-manifold edges.
        """
        fe = vtk.vtkFeatureEdges()
        fe.SetInputData(self.polydata())
        fe.SetBoundaryEdges(boundaryEdges)
        
        if featureAngle:
            fe.FeatureEdgesOn()
            fe.SetFeatureAngle(featureAngle)
        else:
            fe.FeatureEdgesOff()
        
        fe.SetNonManifoldEdges(nonManifoldEdges)
        fe.ColoringOff()
        fe.Update()
        return Actor(fe.GetOutput(), c="p").lw(5)
Return an ``Actor`` that shows the boundary lines of an input mesh.
        
        :param bool boundaryEdges: Turn on/off the extraction of boundary edges.
        :param float featureAngle: Specify the feature angle for extracting feature edges.
        :param bool nonManifoldEdges: Turn on/off the extraction of non-manifold edges.