CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Thanks for the minimal reproducible example!

Actually, if you read again the doc of boost::iterator_facade
you'll see you're using the default for reference, which is
value&. In your case, reference should be value (Triangle is a temporary).

Sebastien.

On 08/07/2014 11:14 PM, Rostislav Khlebnikov wrote:
> Hi everyone,
>
> I'm using AABB_tree to compute intersections of a VTK poly data with a
> plane. When I just convert the triangles from VTK to CGAL and store them
> in std list, everything works fine. However, I would like to reduce
> storage requirements by creating a triangle iterator that iterates over
> the VTK triangle data.
> Code in main.cpp here shows how I do it http://pastebin.com/kNLQevXV
> <http://pastebin.com/sKPFHTT2>
>
> In Release version everything works fine, but in Debug version -
> intersections are never found! (Funnily enough it's a debug version that
> fails). I tried finding the problem - but I don't seem to understand it.
> What I found is that when CGAL uses the kernel to convert from
> Triangle_3 to TriangleC3 with rep() and then uses this TriangleC3's
> vertex() method on line 1909 in function_objects.h, the TriangleC3
> 'base' variable becomes corrupted during get(base) call at line 94 in
> Triangle_3.h (i.e. correct coordinates are overwritten in what seems to
> be stack initialization in function call when I looked at disassembly).
>
> Is it something wrong that I do with my custom iterator? Or perhaps it's
> a bug in VS2013 compiler (I saw some bug reports regarding stack
> corruption for VS2012 such as this
> <http://stackoverflow.com/questions/11000798/structure-parameter-corrupted-on-function-call>,
> so perhaps it's not completely resolved).
>
> I attached all the code, input files and cmake file, so if someone who
> has VTK and CGAL could quitckly test it on their platform. For me the
> release version returns 54 intersections and debug - 0.
>
> Thank you in advance,
>     Rostislav.
>
> CGAL installation info:
> Windows 8.1, MSVS 2013, x64
> CGAL 4.4 installed with the CGAL-4.4-Setup.exe installer and then
> built
> with CMake and MSVS 2013.