CGAL users discussion list

[BRYang <>]

Hi,

I got some issue with Polyhedron_3 I/O stuff. I have two polyhedron .off
files which I downloaded from MIT's
website(https://people.csail.mit.edu/sumner/research/deftransfer/data.html#download)
and I used Meshlab to export them as .off files.  I use the following code
to read in the files

----------------------------------
typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef CGAL::Polyhedron_3<Kernel>         Polyhedron;

/// read the horse.off file
Polyhedron horse;
std::ifstream OpenFile("horse.off");
OpenFile >> horse;
OpenFile.close();
std::cout<< "horse is valid ? " << horse.is_valid() << std::endl; // true
std::cout<< "size of facets ? " << horse.size_of_facets() << std::endl; //
This is O.K, size of polyhedron is correct.
----------------------------------

/////////////////////////////////
However, when I use the following code for the camel.off file, the mesh
could not be read correctly.
----------------------------------
Polyhedron camel;
std::ifstream OpenFile("camel.off");
OpenFile >> camel;
OpenFile.close();
std::cout<< "camel is valid ? " << camel.is_valid() << std::endl; // true
std::cout<< "size of facets ? " << camel.size_of_facets() << std::endl; //
size of polyhedron is incorrect.
----------------------------------

It seems that CGAL does not handle the camel case correctly. 
And I checked the following link
http://cgal-discuss.949826.n4.nabble.com/Binary-Polyhedron-3-I-O-questions-td951182.html#a951191,
and updated the code for camel case to be like this:

-------------------------------
Polyhedron camel;
std::ifstream OpenFile("camel.off",std::ios::binary);
CGAL::set_binary_mode(OpenFile);
OpenFile >> camel;
OpenFile.close();
std::cout<< "camel is valid ? " << camel.is_valid() << std::endl; // true
std::cout<< "size of facets ? " << camel.size_of_facets() << std::endl; //
size of polyhedron is incorrect.
-------------------------------

However, the result is still wrong. Is this a bug or am I missing something
to read the file correctly?

Thanks.

Monica



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