[vtkusers] Extra meta data in pvd

[Chris Marsh]

Hi all,

Following the advice here
http://public.kitware.com/pipermail/paraview/2012-September/026100.html

worked.  That is, in Python, the following works
my_mesh.GetFieldData().GetAbstractArray("proj4").GetValue(0)


On 9 November 2016 at 15:54, Chris Marsh <chris.marsh at usask.ca> wrote:

> Hi Cory,
> Thanks for the reply. This looks like a perfect way forward.
>
> I am following this
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/FieldData
>
> and am having troubles with this approach. The field data doesn't seem to
> be set properly. I can see the field data *name* in paraview when I load my
> mesh, but it has an NA value.
>
>
> What I'm doing is:
>
> std::string _srs_wkt = "my projection data here";
> vtkSmartPointer<vtkStringArray> proj4 = vtkSmartPointer<vtkStringArray
> >::New();
> proj4->SetNumberOfComponents(1);
> proj4->SetName("proj4");
> proj4->InsertNextValue(_srs_wkt);
>
> vtkSmartPointer<vtkUnstructuredGrid> _vtk_unstructuredGrid =
> vtkSmartPointer<vtkUnstructuredGrid>::New();
>
> //... build up _vtk_unstructuredGrid etc.
>
>  _vtk_unstructuredGrid->GetFieldData()->AddArray(proj4);
>
>  //validate
>  vtkStringArray* test = vtkStringArray::SafeDownCast(_
> vtk_unstructuredGrid->GetFieldData()->GetArray("proj4"));
>
>  //test is NULL
>
> any ideas?
> Thanks
>
>
> Chris Marsh
> PhD Candidate
> chrismarsh.ca
>
> 13 Kirk Hall
> University of Saskatchewan
>
> On 9 November 2016 at 01:31, Cory Quammen <cory.quammen at kitware.com>
> wrote:
>
>> Hi Chris,
>>
>> Usually we stuff this kind of data into the generic field data (arrays
>> not associated with points of cells) in the data set. The VTU
>> reader/writer supports reading/writing field data.
>>
>> HTH,
>> Cory
>>
>> On Tue, Nov 8, 2016 at 6:15 PM, Chris Marsh <chris.marsh at usask.ca> wrote:
>> > Hi,
>> >
>> > I would like to add some extra meta-data to a pvd file. Specifically, a
>> > proj4 string containing information about the coordinate system
>> projection
>> > of the data contained in a vtu file.
>> >
>> > Is there a recommended way to do this?
>> >
>> > Cheers
>> > Chris
>> >
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>>
>>
>> --
>> Cory Quammen
>> Staff R&D Engineer
>> Kitware, Inc.
>>
>
>
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