Singular

LIB "polymake.lib";
==> Welcome to polymake version
==> Copyright (c) 1997-2015
==> Ewgenij Gawrilow, Michael Joswig (TU Darmstadt)
==> http://www.polymake.org
intmat M[6][4] =
1,1,0,0,
1,0,1,0,
1,0,-1,0,
1,0,0,1,
1,0,0,-1,
1,-1,0,0;
polytope p = polytopeViaPoints(M);
// visual(p);
fan f = normalFan(p);
==> polymake: used package ppl
==>   The Parma Polyhedra Library (PPL): A C++ library for convex polyhedra
==>   and other numerical abstractions.
==>   http://www.cs.unipr.it/ppl/
==> 
// visual(f);