[Paraview] VTK parallel unstructured grid and halo elements

[Berk Geveci]

The only way to do this currently is to use the threshold filter to remote
the halo nodes.

Best,
-berk

On Fri, Feb 27, 2015 at 6:32 AM, Louie Cardone-Noott <
louie.cardone-noott at linacre.ox.ac.uk> wrote:

> Hi Berk,
>
> Thanks for your reply. Yes that does sound like what I need to do.
> Shouldn't the nodes of elements with vtkGhostLevels>0 already be ignored in
> the range calculation though?
>
> Is there no way to do this currently then? I tried marking them with
> vtkGhostPoints but it didn't help last time I tried.
>
> Cheers,
> Louie
>
> On 25 February 2015 at 18:31, Berk Geveci <berk.geveci at kitware.com> wrote:
>
>> Hi Louie,
>>
>> Ghost/halo nodes are considered valid (but duplicated) so they are taken
>> into account when calculating ranges, statistics etc. What you need is to
>> mark them as invalid, it sounds like? We are making slow progress towards
>> having an infrastructure that supports this but currently it is only
>> partially support for structured grids and AMR meshes and a subset of
>> filters.
>>
>> Best,
>> -berk
>>
>> On Wed, Feb 25, 2015 at 11:06 AM, Louie Cardone-Noott <
>> louie.cardone-noott at linacre.ox.ac.uk> wrote:
>>
>>> Hi again list,
>>>
>>> Inspired by David Ortley's recent success (see "Smooth seams in SILO
>>> files") I wonder if perhaps the way I'm doing it is correct, but Paraview
>>> is incorrectly considering the values at hidden nodes when calculating data
>>> ranges.
>>>
>>> Essentially my "option 3" (writing a vtkGhostLevels array) appears to
>>> work as it should, and the "seams" are hidden in my parallel data. But, if
>>> I then Extract Surface and look at the Data Arrays -> Data Ranges I see
>>> values which can only be from non-surface nodes. I suspect they are
>>> probably from nodes on the (hidden) interior surfaces. This is obviously a
>>> bug.
>>>
>>> I could probably provide a minimal example if useful.
>>>
>>> Best wishes,
>>> Louie
>>>
>>>
>>> On 17 January 2015 at 16:26, Louie Cardone-Noott <
>>> louie.cardone-noott at linacre.ox.ac.uk> wrote:
>>>
>>>> Hi Paraview list,
>>>>
>>>> I use a finite element code that generates VTK output, but I'm having
>>>> trouble dealing with halo (ghost) nodes/elements correctly.
>>>>
>>>> We currently partition meshes node-wise, and each process writes all
>>>> its owned nodes and one level of halo nodes to a chunk. Once all the chunks
>>>> are loaded there is a "double layer" of internal boundaries between
>>>> processes. I'd really like to be able to use the Extract Surface filter
>>>> correctly but as you would expect it also finds all the internal surfaces.
>>>> From searching I've tried:
>>>>
>>>> * Clean To Grid, but this removes both sides of the double layer
>>>> leaving unsightly gaps.
>>>> * Writing a vtkGhostPoints array (on nodes) but this seems not to be
>>>> used by this filter (or Paraview at all?)
>>>> * Writing a vtkGhostLevels array (on elements). This correctly hides
>>>> all the ghost elements at the internal boundaries (great!) but still
>>>> doesn't let me do everything I want to. For example, the extracted surface
>>>> looks right, but the array limits still seem to be based on the max/min of
>>>> the external AND internal surfaces, so I suspect the internal ones are just
>>>> "hidden from view".
>>>>
>>>> What's the right way to deal with this?
>>>>
>>>> Thanks in advance.
>>>>
>>>> Louie
>>>>
>>>> _______________________________________________
>>>> Powered by www.kitware.com
>>>>
>>>> Visit other Kitware open-source projects at
>>>> http://www.kitware.com/opensource/opensource.html
>>>>
>>>> Please keep messages on-topic and check the ParaView Wiki at:
>>>> http://paraview.org/Wiki/ParaView
>>>>
>>>> Search the list archives at: http://markmail.org/search/?q=ParaView
>>>>
>>>> Follow this link to subscribe/unsubscribe:
>>>> http://public.kitware.com/mailman/listinfo/paraview
>>>>
>>>>
>>>
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Please keep messages on-topic and check the ParaView Wiki at:
>>> http://paraview.org/Wiki/ParaView
>>>
>>> Search the list archives at: http://markmail.org/search/?q=ParaView
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://public.kitware.com/mailman/listinfo/paraview
>>>
>>>
>>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the ParaView Wiki at:
> http://paraview.org/Wiki/ParaView
>
> Search the list archives at: http://markmail.org/search/?q=ParaView
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/paraview
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/paraview/attachments/20150302/fa3521ea/attachment.html>