# Projection of a Polyhedron on xy Plane with CGAL

I am trying to project a Polyhedron on the xy plane with CGAL, which should result in a (2D) polygon.

I wonder, if there is an elegant way to achieve it?

Of course, I can iterate over all surfaces and build 2D-Segments from the 3D-Segments by throwing away the z coordinate and then reassemble the polgon cycles.

But I feel, that somehow using Projection_traits_xy_3 it should be possible to solve that task more elegant, however, I couldn't find a way. Is this possible?