Hi Vtkusers: I use vtkdelaunay3D class to generate a tetrahedron mesh. Howerer I want know how to obtain the boundary cells which located on the surface in the mesh thanks in advance! yxliu. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20030830/260a3f6e/attachment.htm>