CGAL users discussion list

["Max" <>]

Hello Peter,

I've tested with three OFF models as attached.
The output are as follows:

1. robocat_deci.off
I got only a bunch of "Error !!!!!!!!!!!!!!!!!!!!!!!" then 
the program terminated abnormally.

2. torus_tri.off 
The program terminated abnormally without saying anything.

3. Simple.off
The program said:
old impl 0.07
new impl 0.06
and then ends normally.

My platform:
CGAL 3.3.1
Windows XP/SP2
VS2005 without SP1

Build under release mode.

One more question: If the code runs correctly, how can I get
the group of single closed polyhedrona I needed?

p.s., I've slightly modified the program to get a model in OFF format.
it's also attached. perhaps some problem comes from the conversion 
from a polyhedron to a nef_3.

B/Rgds
Max

>Hello Peter,
>
>Thank you very much for you prompt and detailed reply!
>I'll test your code addition and post the result asap.
>
>B/Rgds
>Max
>
>>Hi Max,
>>
>>I got this question frequently off late. For this reason I implemented a
>>new function. Add the attached file shell_to_nef_3.h to your
>>include/CGAL/Nef_3 directory and add the following code to
>>Nef_polyhedron_3.h:
>>
>>Nef_polyhedron_3(const Nef_polyhedron& N,
>>                 SFace_const_iterator sf)
>>{
>>  SNC_structure rsnc;
>>  *this = Nef_polyhedron_3(rsnc, new SNC_point_locator_default, false);
>>  initialize_infibox_vertices(EMPTY);
>>  shell_to_nef_3(N, sf, snc());
>>  build_external_structure();
>>  simplify();
>>  CGAL::Mark_bounded_volumes<Nef_polyhedron_3> mbv(true);
>>  delegate(mbv);
>>  set_snc(snc());
>>}
>>
>>There is another file attached, which demonstrates the usage. This
>>program compares two methods of conversion, an old and simple one with
>>the new one. If you don't use CGAL 3.3.1, you won't have the code for
>>the old implementation and need to comment/ignore the first part of the
>>program. I originally wrote the code to work for closed inner shells,
>>but maybe it also works non-closed shells and outer shells. Please tell
>>me how it works.
>>
>>Peter
>>
>>
>>On Thu, 2008-01-17 at 19:18 +0800, Max wrote:
>>> Hi all,
>>> 
>>> I know if a Nef_polyhedron is simple (or, in other words,
>>> a manifold), it could be converted to a single polyhedron 
>>> with the method: 
>>> 
>>> Nef_polyhedron::convert_to_Polyhedron ( Polyhedron& P) 
>>> 
>>> My question is, if N is not a single manifold, but still finite, 
>>> is there a way in CGAL to convert it into a group of polyhedra?
>>> 
>>> Thanks for any help.
>>> 
>>> B/Rgds
>>> Max
>>> 
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Attachment: torus_tri.off
Description: Binary data

Attachment: simple.off
Description: Binary data

Attachment: robocat_deci.off
Description: Binary data

Attachment: convert_shell_to_nef3.cpp
Description: Binary data