Dear David: I have read the example you give. And the input of vtkContourTriangulator is all surface, how can I input a set of points ? ZhangQiang -- View this message in context: http://vtk.1045678.n5.nabble.com/How-to-set-the-boundary-of-vtkDelaunay2D-tp5734142p5734149.html Sent from the VTK - Users mailing list archive at Nabble.com.