[vtkusers] Extra meta data in pvd

[Chris Marsh]

No problem.

Does anyone know who would be able to amend the example I linked above to
include the string? It is not at all clear from the docs that string
behaves differently.


On 11 November 2016 at 09:30, Cory Quammen <cory.quammen at kitware.com> wrote:

> Ah, yes, I should have caught that you would be using a
> vtkStringArray, which is not accessed the same way as the numeric data
> arrays. Glad you found the solution.
>
> Cory
>
> On Thu, Nov 10, 2016 at 2:15 PM, Chris Marsh <chris.marsh at usask.ca> wrote:
> > 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->GetField
> Data()->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.
> >>
> >>
> >
>
>
>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>
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