On Sat, Dec 31, 2011 at 3:44 AM, Ali Habib <ali.mahmoud.habib at gmail.com> wrote: > I saw in the documentation of vtk that vtkImageShrink3D subsample the data > in steps, but I need more illustration, what the actual function of it, how > it work Did you check the examples? http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/ImageShrink3D David