Hi all! I'm trying to make a visualization of the intersection of a 3D-fan with the hyperplane \{z=1\} . I have made the following code: application('fan'); $p = new Polytope<Rational>(POINTS=>[[1,2,0,1],[1,1,1,0],[1,0,2,1],[1,1,0,0],[1,0,1,0],[1,0,0,2]]); $f = normal_fan<Rational>($p); $H = new Pol...