CGAL users discussion list

[Peter Hachenberger <>]

Oh, that was not my brightest idea. Unfortunately, the output function
does not give me the desired information, because it uses the same
problematic call to show the desired information.

I still think that it is not a problem of my code, but of your CGAL
installation, but I don't want you to go fishing for problems with your
installation before I did not have good evidence for this assumption. To
provemy assumption, kick out the new line in polyhedron_to_nef3.h and
replace it with

    std::cerr << "test first sedge " 
              << SM.shalfedges_begin()->source()->point()
              << std::endl;

    typename SNC_structure::Object_list ol;
    ol.push_back(SM.shalfedges_begin());
    typename SNC_structure::SFace_cycle_iterator sfci(ol.begin());
    CGAL_assertion(sfci.is_shalfedge());

That fourth line is the same call that causes the problem. The
is_shalfedge() command calls a dynamic cast that decides whether the
Object_handle sfci points to can be cast to an shalfedge. With the lines
above I put a valid shalfege into sfci. I know that it's valid from the
output generated by the first lines. So, if you know get a correct
output by the first line and then got a fault in the assertion line (not
a thrown assertion, but the same error as before), then I'm right and
there is some problem with the installation.

Peter


On Tue, 2008-01-08 at 09:12 +0800, LoadCom wrote:
> Hello Peter Hachenberger
> 
> I've made change as you suggested to polyhedron_3_to_nef_3.h(not 
> polyhedron_to_nef_3.h).
> 
> The program's output before error occur is as dos.png.
> The context at the stop point is as snapshot.png.
> 
> The 2 files are as attached.
> Thanks for your help.
> 
> B/Rgds
> Max
> 
> ----- Original Message ---- 
> From: Peter Hachenberger
> To: 
> 
> Sent: 2008-01-07 20:49:42
> Subject: Re: Re: Re: [cgal-discuss][Polyhedron] Simple program problem
> 
> >
> Hi Max,
> 
> Looking at the latest debug picture 1.png, we can try the following
> stuff:
> 
> The programm stops at an integrity check of the data structure. I want
> to check whether the data structure really lacks integrity or whether
> its something else. Please add the line 
> 
>     CGAL::SM_io_parser<SM_decorator>::dump(SM, std::cerr);
> 
> in front of the fifth line from the end in polyhedron_to_nef_3.h, which
> looks as follows:
> 
>     SM.check_integrity_and_topological_planarity();
> 
> So that it looks like
> 
>     CGAL::SM_io_parser<SM_decorator>::dump(SM, std::cerr);
>     SM.check_integrity_and_topological_planarity();   
>   }
> 
>   index_adder.resolve_indexes();
> }
> 
> at the end of the file. Then compile and execute your program again and
> send me the output, please. 
> 
> Peter
> 
> 
> On Fri, 2008-01-04 at 16:25 +0800, LoadCom wrote:
> > Hello Mahmood NT,
> > 
> > This time the point the program stoped at is different.
> > The location as well as the call stack is captered as 
> > attached.
> > 
> > Thanks for your help.
> > Max
> > 
> > 
> > Re: Re: [cgal-discuss][Polyhedron] Simple program problem
> > 
> > >Thank you very much for your reply.
> > 
> > >My environment:
> > >CGAL 3.3.1
> > >Windows XP/SP2
> > >VS 2003
> > 
> > >The program causes a runtime error, see the attached 1.png. (debug mode)
> > 
> > Did you set project properties properly. check your project propeties  
> > with a simple example or demo (if you use QT).
> > 
> > Also it would be helpful to post the call stack.
> > 
> >  
> > Mahmood NT
> > 
> -- 
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