On Thu, May 24, 2012 at 2:20 PM, Anka Kochanowska <pluszcz at gmail.com> wrote: > Hi! > You could get vtkPolydata as output from vtkContourFilter then use > vtkPolyDataWriter to output surface as .vtk file. > Anka But don't do that unless you have a good reason, as .vtk is deprecated in favor of .vtp :) David