title: Write out a triangulation result to an OBJ file in CGAL
body: <p>I'm trying to make use of a 2D triangulation using CGAL, and create an obj file. I'm able to create a 2D triangulation. I now want to make the 3rd coordinate 0, ie z=0, and create a obj file out of the result of the triangulation. The samples of CGAL seem quite confusing, and I'm not sure how to go about this.</p>