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<p>See</p>
<p><a class="moz-txt-link-freetext" href="https://gitlab.dune-project.org/extensions/dune-vtk/-/merge_requests/47">https://gitlab.dune-project.org/extensions/dune-vtk/-/merge_requests/47</a></p>
<p>for an example implementation of an edge-datacollector, or more
generally a data-collector that collects data from any requested
codim sub-entity-set.</p>
<p>Best,<br>
Simon<br>
</p>
<div class="moz-cite-prefix">On 6/22/23 15:41, Simon Praetorius
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:d5c3cf48-6011-b195-b7af-4f360df6ab11@tu-dresden.de">
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<p>Hi Santiago,</p>
<p>Maybe this is also similar in dune-vtk. There, the "extractor"
is called "datacollector". You can implement an interface where
you can essentially collect whatever you want. But there is no
example for intersection grids.</p>
<p>In the simplest form you could follow the
ContinuousDataCollector. If you do not have a parallel grid it
can even be simplified. The numPoints() function should return
the number of vertices in the grid and the numCells() function
the number of edges. The points() implementation is the same as
in the continuous data-collector and the cells() function just
iterates over the edges instead of the elements. The only thing
where you need to be a bit careful is the pointData() (or
cellData()) function. The input is a grid-function. The
abstraction is currently not general enough to allow
grid-functions to be bound to entity sets that are not the
elements of the grid. Thus, the implementation for the
pointData() should be the same as a the ContinuousDataCollector
and for the cellData() you just need to evaluate in e.g. the
edge centers instead of the element centers.</p>
<p>I hope you got an idea of how to implement it. As I said, it is
not yet tested and I cannot give any guarantees that it works.
But if it does, it would be great if you could contribute this
to the repository.<br>
</p>
<p>Best,<br>
Simon<br>
</p>
<div class="moz-cite-prefix">On 6/22/23 08:05, Christian Engwer
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:13FB937D-91F8-4966-9B4C-F9362F7880AE@uni-muenster.de">
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<div dir="auto">Dear Santiago,<br>
<br>
long ago I implemented something like that to visualise data
of a UDG discretization. I'm partially using the dune-grid vtk
writer, but defined a different "extractor" to collect the
data.<br>
<br>
We never polished it, if you want, I can give you access.<br>
<br>
Best Christian <br>
</div>
<br>
<br>
<div class="gmail_quote">
<div dir="auto">Am 22. Juni 2023 06:40:14 MESZ schrieb "Ospina
De Los Rios, Santiago" <a class="moz-txt-link-rfc2396E"
href="mailto:santiago.ospina@iwr.uni-heidelberg.de"
moz-do-not-send="true"><santiago.ospina@iwr.uni-heidelberg.de></a>:</div>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;"> Dear Dune Developers,<br>
<br>
I was wondering if any of you had faced the problem of
writing data for intersection data for VTK? In particular, I
am interested in 0D/1D/2D VTK meshes+data (not C++ grids)
resulting from the intersection between the 1D/2D/3D
non-overlapping domains of a grid. So far, I only use
conforming grids, so either interesection or codim:=1 entity
writers would do for me.<br>
<br>
I could not see any hint to these kind of writers in the
dune-grid and dune-vtk modules. Maybe I missed it? So I was
wondering if any of you already had similar problem/solution
or if you see an easy way to re-use the existing writers for
this purpose? Any pointer would be appreciated, thanks!<br>
<br>
Best,<br>
Santiago </blockquote>
</div>
<br>
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<pre class="moz-signature" cols="72">--
Dr. Simon Praetorius
Institut für Wissenschaftliches Rechnen
Fakultät Mathematik
Technische Universität Dresden
Tel.: TUD-34432
Mail: <a class="moz-txt-link-abbreviated moz-txt-link-freetext" href="mailto:simon.praetorius@tu-dresden.de" moz-do-not-send="true">simon.praetorius@tu-dresden.de</a>
Web: <a class="moz-txt-link-freetext" href="https://tu-dresden.de/Members/simon.praetorius" moz-do-not-send="true">https://tu-dresden.de/Members/simon.praetorius</a></pre>
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Dr. Simon Praetorius
Institut für Wissenschaftliches Rechnen
Fakultät Mathematik
Technische Universität Dresden
Tel.: TUD-34432
Mail: <a class="moz-txt-link-abbreviated" href="mailto:simon.praetorius@tu-dresden.de">simon.praetorius@tu-dresden.de</a>
Web: <a class="moz-txt-link-freetext" href="https://tu-dresden.de/Members/simon.praetorius">https://tu-dresden.de/Members/simon.praetorius</a></pre>
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