[ITK-users] Do any of the mesh file formats store CellData?

[Arnaud Gelas]

Davis,

Can you write a c++ example (please not a c++-11 one) along with
corresponding cmakelists.txt either on itk wiki examples [1], either on
ITKExamples [2] (see [3] for contributing), please?

Thanks,
Arnaud

[1] http://itk.org/Wiki/ITK/Examples
[2] http://itk.org/ITKExamples/index.html
[3] http://itk.org/ITKExamples/Documentation/Contribute/index.html

On Mon, Aug 17, 2015 at 12:57 PM, DVigneault <davis.vigneault at gmail.com>
wrote:

> All--
>
> I've rebuilt in debug mode and stepped through with gdb.  It looks like the
> CellData is being deallocated at the following line in
> itkProcessObject.cxx.
> The comment suggests that this result is expected?
>
> 1684      /**
> 1685       * Prepare all the outputs. This may deallocate previous bulk
> data.
> 1686       */
> 1687      this->PrepareOutputs();
>
> By putting a breakpoint at itkProcessObject.cxx:1687, we can see where the
> pointer is being reset:
>
> $ gdb ./dv-mesh-test
> (gdb) b itkProcessObject.cxx:1687
> (gdb) r
> (gdb) c # First time is due to sphere source
> (gdb) select-frame 3 # Brings us back into itk::MeshFileWriter::Write
> (gdb) p input->GetCellData() # A valid pointer
> (gdb) n # Step over this
> (gdb) p input->GetCellData() # A null pointer
>
> Here's the backtrace at that point:
>
> #0  itk::ProcessObject::UpdateOutputData (this=0x936a30) at
>
> /local/pemb3433/Developer/ITK/src/Modules/Core/Common/src/itkProcessObject.cxx:1695
> #1  0x000000000052f9fd in itk::DataObject::UpdateOutputData (this=0x93b290)
> at
>
> /local/pemb3433/Developer/ITK/src/Modules/Core/Common/src/itkDataObject.cxx:416
> #2  0x000000000052f6af in itk::DataObject::Update (this=0x93b290) at
>
> /local/pemb3433/Developer/ITK/src/Modules/Core/Common/src/itkDataObject.cxx:341
> #3  0x00000000004fb544 in itk::MeshFileWriter<itk::Mesh<float, 3u,
> itk::DefaultStaticMeshTraits<float, 3u, 3u, float, float, float> >
> >::Write (this=0x93ca40)
>     at
>
> /local/pemb3433/Developer/ITK/src/Modules/IO/Mesh/include/itkMeshFileWriter.hxx:148
> #4  0x00000000004f9bf1 in itk::MeshFileWriter<itk::Mesh<float, 3u,
> itk::DefaultStaticMeshTraits<float, 3u, 3u, float, float, float> >
> >::Update (this=0x93ca40)
>     at
>
> /local/pemb3433/Developer/ITK/src/Modules/IO/Mesh/include/itkMeshFileWriter.h:145
> #5  0x00000000004f8185 in main () at
>
> /local/pemb3433/Developer/Bitbucket/oxford/Stebbing_Method/MeshTest/src/dv-mesh-test.cxx:32
>
> I'm stretching my knowledge both of ITK and gdb here, so please do let me
> know if I'm misinterpreting the output--but it seems to me that the
> CellData
> is being deallocated when itkProcessObject.cxx:1687 is called, and
> therefore
> it (a) isn't being written to file and (b) isn't available after the mesh
> is
> written.
>
> Is this a bug in my code?  A bug in ITK?  A feature I don't understand?
> Thanks very much in advance for your help!
>
> Best,
>
> --Davis
>
>
>
> --
> View this message in context:
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