[vtkusers] vts periodic boundaries

[Patrick Bechlars]

Hi Andy,

The derivatives and other filters involving spatial data are not too 
important as I do all calculations externally. It is mainly about the 
plotting. If I want to stick to StructuredGrid, then there will always 
be this additional boundary. Is that what you are saying?
Is there nothing like a GhostLevel="#" option for specific boundaries in 
the Serial XML File Format or a filter that does that work afterwards?

Best regards,
Patrick

On 31/07/13 15:11, Andy Bauer wrote:
> Hi Patrick,
>
> You can make a vtkStructuredGrid act like it is periodic by making the 
> first and last set of points be coincident. It looks like you need one 
> more level of cells as well as one more level of points. The thing is 
> that depending on the filter, you may not get the behavior you want. 
> For example, if you extract the boundary of the grid it will show a 
> boundary where the first and last set of cells meet. Also, the 
> computed gradient will not be continuous there either.
>
> The only wa to get around that is to either use a vtkPolyData if it's 
> 2D or a vtkUnstructuredGrid.
>
> Regards,
> Andy
>
> On Wed, Jul 31, 2013 at 6:10 AM, Patrick Bechlars 
> <patrick.bechlars at soton.ac.uk <mailto:patrick.bechlars at soton.ac.uk>> 
> wrote:
>
>     Dear all,
>
>     I am trying to write out a cylindrical data set as a vtk file in
>     StructuredGrid form to read it in Paraview. I would like to write
>     the vtk file in a way that the first and last cell (see gap in the
>     picture) are connected. Does any of you have experience in that
>     and/or have a hint how to achieve that.
>
>     One idea was to write it in parallel format as two pieces and add
>     ghost cells, but this would be quite dirty and is not exactly what
>     I want.
>
>     Any idea is welcome!
>
>     Thanks a lot
>     Patrick
>
>     -- 
>     Patrick Bechlars
>     Aerodynamics and Flight Mechanics Group
>     Faculty of Engineering and the Environment
>     University of Southampton
>     Building 13, 2071
>     Highfield
>     Southampton
>     SO17 1BJ
>     email: patrick.bechlars at soton.ac.uk
>     <mailto:patrick.bechlars at soton.ac.uk>
>
>
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-- 
Patrick Bechlars
Aerodynamics and Flight Mechanics Group
Faculty of Engineering and the Environment
University of Southampton
Building 13, 2071
Highfield
Southampton
SO17 1BJ
email: patrick.bechlars at soton.ac.uk

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