[Paraview] Clean Grid and Average Point Data

[Tristan Schlögl]

Hi Andy,

thanks for your reply. I tried working with the "point data to cell data"
and "cell data to point data" filters. Indeed, this is too much averaging.
It might be a starting point for only the discontinuous field I'm interested
in, but the filter applies on all data in my model (e.g. I don't want the
continuous displacement field and others to be averaged). Is there a way to
specify only a certain dataset the filter is working on?

Regarding the programmable filter, I'm very new to ParaView internals (I'm
mainly working with the GUI), however I'm a bit experienced with Python. Can
you recommend some tutorial, where I get a quick introduction in how to
access the data and modify it?

I believe dealing with this problem in deal.ii directly requires some
changes in the library itself. Maybe you can also do something with derived
classes. However, having the full information of a discontinuous field, like
deal.ii outputs it, is generally not a bad thing to examine results. I just
sometimes need 'cleaner' pictures and thought that's a post processing task,
best be handled in ParaView.

Tristan


Von:  Andy Bauer <andy.bauer at kitware.com>
Datum:  Montag, 28. Juli 2014 16:38
An:  Tristan Schloegl <tristan.schloegl at ltd.uni-erlangen.de>
Cc:  "Paraview at paraview.org" <Paraview at paraview.org>
Betreff:  Re: [Paraview] Clean Grid and Average Point Data

Hi Tristan,

There are a couple of things you can try. The best but most complex is
probably the programmable filter where you merge the points yourself and do
the averaging for the point values. The other thing you can try is using the
point data to cell data filter, then use the clean to grid filter and
finally use the cell data to point data filter. This may due more averaging
than you would like for your results. Other than that, did you get any
feedback on the deal.II mailing list?

Regards,
Andy


On Mon, Jul 28, 2014 at 8:37 AM, Tristan Schlögl
<tristan.schloegl at ltd.uni-erlangen.de> wrote:
> Hi,
> 
> I'm using ParaView to visualise finite element simulation results created by
> the deal.ii C++ library. Deal.ii outputs hex elements such that each element
> has its own vertices. To illustrate that point a simple cube consisting of 8
> elements and 27 nodes has 8*8=64 data points. When I display vector valued
> data as glyphs I have multiple vectors at the same location resulting from the
> contributions of neighbouring cells, see
> http://blogs.fau.de/schloegl/files/2014/07/orig_grid.png .
> 
> I now want to display only a single vector at each point, namely the average
> value of all contributions. I tried and applied a "Clean to Grid" filter, see
> http://blogs.fau.de/schloegl/files/2014/07/clean_grid.png .
> This is quite good already however, it seems that ParaView only takes one of
> the vectors for each point and not the average (see top mid vector of the
> front (z-max) face).
> 
> Is there any other way to realise what I need in ParaView?
> 
> Regards
> Tristan
> 
> 
> -- 
> Dipl.-Ing. Tristan Schlögl
> Chair of Applied Dynamics
> University of Erlangen-Nuremberg
> Haberstrasse 1
> D-91058 Erlangen, Germany
> room 01.013
> phone +49 (0)9131 85 61003 <tel:%2B49%20%280%299131%2085%2061003>
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> url www.ltd.tf.uni-erlangen.de <http://www.ltd.tf.uni-erlangen.de>
> 
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