[Paraview] Extracting boundary regions

[Renato N. Elias]

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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>
>