[vtkusers] Question about unstructured grids

[Martin Genet]

Glad that helped, Eric.

Well, if you have the connectivity you can just write the surface cells 
(triangles, quadrangles) like you did with the vertexes. If you don't 
have the connectivity then I do not know, but I'm sure someone on the ML 
will be able to help.

Martin

On 01/02/2016 16:32, Eric Robertson wrote:
> Thanks Martin. That works pretty well.
>
> I might add that I am scripting in C++ but I was quickly able to 
> translate.
>
> I see the output shows up in Paraview as a ton of points. How may I 
> proceed to make it a 'surface' which connects these points? (the data 
> set is a wing).
>
> On Mon, Feb 1, 2016 at 4:22 AM, Martin Genet 
> <martin.genet at polytechnique.edu 
> <mailto:martin.genet at polytechnique.edu>> wrote:
>
>     Hi Eric,
>
>     Paraview only displays cells, not points.
>
>     There are at least two solutions:
>      - When you write the ugrid file, you can add vertices, which are
>     cells containing a single point, using something like:
>>     cell = vtk.vtkVertex()
>>     cell_array = vtk.vtkCellArray()
>>     for k_point in xrange(ugrid.GetPoints().GetNumberOfPoints()):
>>         cell.GetPointIds().SetId(0, k_point)
>>         cell_array.InsertNextCell(cell)
>>     ugrid.SetCells(vtk.VTK_VERTEX, cell_array)
>>     for k_array in xrange(ugrid.GetPointData().GetNumberOfArrays()):
>>     ugrid.GetCellData().AddArray(ugrid.GetPointData().GetArray(k_array))
>     - Otherwise, if you have only points in your ugrid, you can glyph
>     them in paraview, using for instance a sphere with fixed small
>     diameter.
>
>     Martin
>
>
>     On 01/02/2016 05:07, Eric Robertson wrote:
>>     Hi all,
>>
>>     I have a raw data set of X,Y,Z coordinates as well as a set of
>>     scalars (lets call them A, B, C) which are stored at the
>>     aforementioned coordinates. I use vtkUnstructuredGrid to create
>>     the domain, but when I go to open the .vtu file in Paraview I see
>>     that there aren't any cells to visualize.
>>
>>     My question is- how do I go about providing 'cells' which use
>>     these points as cell-centers?
>>
>>
>>     _______________________________________________
>>     Powered bywww.kitware.com <http://www.kitware.com>
>>
>>     Visit other Kitware open-source projects athttp://www.kitware.com/opensource/opensource.html
>>
>>     Please keep messages on-topic and check the VTK FAQ at:http://www.vtk.org/Wiki/VTK_FAQ
>>
>>     Search the list archives at:http://markmail.org/search/?q=vtkusers
>>
>>     Follow this link to subscribe/unsubscribe:
>>     http://public.kitware.com/mailman/listinfo/vtkusers
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20160201/6fca2423/attachment.html>