Hello! On Wed, Oct 15, 2008 at 1:35 PM, Fabio Meneghini <fab.meneghini at gmail.com> wrote: > Is there any method to automatically crop out the zeros The Threshold-filter may help here: <http://www.vtk.org/doc/nightly/html/classvtkThreshold.html> hth mirko -- Real programmers don't document; if it was hard to write, it should be hard to understand.