[vtkusers] Extra meta data in pvd

[Chris Marsh]

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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