[ITK] [ITK-users] FEMRegistration

[Matt McCormick]

Hi Martin,

An itk::Mesh will need to be constructed from the the
itk::fem::FEMObject manually.  We could use a set of converter
classes.

HTH,
Matt

On Fri, Sep 26, 2014 at 4:46 PM, Martin Genet <genet at biomed.ee.ethz.ch> wrote:
> Thanks a lot, Matt. I'm still a little confused though. I can access the
> mesh using:
>>
>> typedef itk::fem::FEMObject< 2 > MeshType;
>> MeshType::Pointer mesh =  registrationFilter->GetInputFEMObject();
>
>
> However, when trying to create a writer using
>> typedef itk::MeshFileWriter< MeshType > MeshWriterType;
>> MeshWriterType::Pointer meshWriter = MeshWriterType::New();
> , it complains that InputMeshType (itk::fem::FEMObject< 2 > I guess) is
> missing a lot of stuff (e.g., RegionType, PixelType, GetPoints, etc.).
>
> If I use
>> typedef itk::Mesh< float, 2 > MeshType;
> instead, I can define the writer, but then I can't access the mesh from the
> registration filter of course.
>
> Is there a way to write registrationFilter->GetInputFEMObject() into a vtk
> file? Thanks again, and sorry again for the confusion.
>
> Martin
>
>
> On 09/22/2014 10:54 PM, Matt McCormick wrote:
>>
>> Hi Martin,
>>
>> itk::MeshFileReader and itk::MeshFileWriter are great classes for
>> importing / exporting meshes.
>>
>> HTH,
>> Matt
>>
>> On Mon, Sep 22, 2014 at 3:49 PM, Martin Genet <genet at biomed.ee.ethz.ch>
>> wrote:
>>>
>>> Dear all:
>>>
>>> Trying to use FEMRegistration on a bunch of images. Still trying to
>>> figure
>>> out the following:
>>>
>>>   - What is the simplest way to convert an external mesh (e.g.,
>>> vtkUnstructuredGrid, or GMSH) into an FEMObject (for registration), and
>>> vice
>>> versa (for post-treatment, vizualization)?
>>>
>>>   - If the mesh covers only a subset of the image, what happens to the
>>> rest
>>> of the image?
>>>
>>> Any help would be super appreciated. Sorry if that's too trivial. Thanks
>>> in
>>> advance.
>>>
>>> Martin
>>>
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