CGAL users discussion list

[Peter Hachenberger <>]

Yes, you are right. I'm not even sure whether that's in the documentation. I

should look that up. The first volume, i.e., N.volumes_begin(), is always the

outer volume. Also, in the list of shells of a volume, the first one is always the

enclosing shell. In case of the outer volume, there is no outer shell.

Peter

 

-----"Amir Vaxman" <> wrote: -----

To: <>
From: "Amir Vaxman" <>
Date: 03/15/2009 01:56PM
Subject: RE: [cgal-discuss] Nef Polyhedron Iteration

I’m sorry to bother, but I don’t see how in shell_exploration.cpp (which computes the minimal vertex) I get to see which of the shells is the outer shell (and in 2D, I also want to know which of the cycles is the outer cycle of a facet). Do these happen to be the first facet cycle/shell in the respective iterations?

 

Thanks,

Amir.

 

From: Peter Hachenberger [mailto:]
Sent: Wednesday, March 11, 2009 6:58 PM
To:
Subject: Re: [cgal-discuss] Nef Polyhedron Iteration

 

Look into the example programs. I made one for most of these
cases. Your first question is answered by shell_exploration.cpp
Peter

 

-----"Amir Vaxman" <> wrote: -----

To: <>
From: "Amir Vaxman" <>
Date: 03/11/2009 12:25PM
Subject: [cgal-discuss] Nef Polyhedron Iteration

Hello,

 

How do I iterate on the shells of a given volume, knowing which is the outer shell and which are holes? Furthermore, how do I get a  halffacet of every shell?

 

Amir.

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