[Paraview] Extracting boundary regions

[Berk Geveci]

Hmm. I think you can do this in paraview 3. I added a filter call
"Extract Cells by Region". It is like clip but it does not actually
clip the cells it intersects, it either keeps them or discards them
(user option). That filter would allow you to create a plane that
intersects the cells to be included.

-berk

On Wed, Apr 9, 2008 at 3:02 PM, Renato N. Elias <rnelias at nacad.ufrj.br> wrote:
>
>  What a shame, I had forgotten the clip filter... but I'm afraid that the
> clip box (or 6 planes) will not be accurate to select the right region since
> it would try to intersect the mesh and not select the nodes and cells based
> on their coordinates (as I did with the threshold). For example: with the
> clip filter I could not select those nodes lying on the bottom and top faces
> since they are shared by the cylinder and the clip filter would cut them
> out.
>
>  Anyway, the clip filter can help to solve the problem partially.
>
>  Renato.
>
>
>
>  Berk Geveci wrote:
>
> > Wouldn't extract surface -> clip work? You may need 6 clip filters
> > now. We are going to add the functionality of clipping with a box back
> > in soon. You also be able to use the selection stuff. Select the cells
> > and extract them maybe?
> >
> > -berk
> >
> >
> > On Wed, Apr 9, 2008 at 12:09 PM, Renato N. Elias <rnelias at nacad.ufrj.br>
> wrote:
> >
> >
> > >  I'm looking for a way to extract boundary regions from solid
> unstructured
> > > meshes (tetrahedra). The purpose of this is simple: use ParaView to set
> > > boundary conditions for a CFD code. In PV 2.6.2 I'm able to extract
> plane
> > > aligned regions using the following pipeline: (as an example, let's
> consider
> > > I'm extracting those boundary nodes lying on the maximum X coordinate:)
> > >
> > >  Unstructured mesh (tetrahedra) --> Extract surface --> Calculator (get
> > > coords_0 scalar per point values) --> Threshould (Scalars = Result of
> the
> > > calculator filter, Lower and Upper set to the maximum value).
> > >
> > >  Ok, it works just fine. My problem is regarding non aligned boundaries.
> > > Here is an example of what I'm trying to do
> > > http://www.nacad.ufrj.br/~rnelias/paraview/regions.jpg . In this
> example, I
> > > can extract the plane boundary regions but I can't extract the cylinder
> at
> > > the middle of the domain. Any idea?
> > >
> > >  Regards
> > >
> > >  Renato.
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> > >
> > >
> >
> >
> >
>
>