CGAL users discussion list

[Luis Rodriguez <>]

Well, the whole project is based on _Nef_polyhedrons so I can't change now, I am performing boolean operations for 9 intersection model.

Thank you for your suggestion, I think that is the best option I have. 

On Wed, Jul 25, 2012 at 2:59 PM, Noel Warren <> wrote:

I don't know of any such function.  I still don't understand why you need to work with Nef_polyhedron_3.  Do you want to perform boolean operations on them or minkowski sums?  There are other CGAL classes meant for dealing with point clouds and meshes.  Are you sure they're not fit for your needs?

If you want to proceed with Nefs I would...

1) Create a Polyhedron_3 from an OFF file

2) If it is closed create a Nef_polyhedron_3 from it

3) Else Construct Nef_polyhedrons directly and manually for each face in the OFF file and then add them together

2012/7/25 Luis Rodriguez <>

Yes I do. I am working on a project where we get a point cloud of a scene, lets say a classroom. I change the format to get off files of every element and then analyze them. So I need to make this program as generic as possible. 

Is there any function that can help me add or delete the extra facets depending on the needs of the polyhedron_3?

On Wed, Jul 25, 2012 at 2:32 PM, Noel Warren <> wrote:

So here we have two triangles that make a kind of bow-tie.  Do you want this to be a Nef_polyhedron_3 too?  In this case I would follow the procedure I mentioned before, using the Nef constructor.  Why do you want such a Nef?  Just curious