Unfortunately I am using polyhedral/ hexa mesh with higher order scheme, find the minimum on a mesh point is a good start. But if someone know a programmable filter that, using VTK is able to find the minimum would be a lot useful. The method would be very robust and not very sensitive to variations in the mesh that may undergo slight variations. Do you have any ideas for how to use vtk and / or numpy for this purpose?
Best Regards, Andrea From: Cory Quammen [mailto:[email protected]] Sent: Thursday, May 03, 2018 16:17 To: Caffagni, Andrea Cc: Mathieu Westphal; [email protected] Subject: Re: [Paraview] find minimum on a slice using interpolated values Andrea, Are your mesh cells linear (and hence linear interpolation would be used)? If so, then the minimum will always be at a mesh point. If they are higher order elements, then indeed the minimum could be somewhere inside a cell. Others on the list may be able to tell you if there is a way to find this minimum point in VTK. Best regards, Cory On Thu, May 3, 2018 at 4:13 AM Caffagni, Andrea <[email protected]<mailto:[email protected]>> wrote: Thank you Mathieu for your suggestion, But if I understand correctly with this method I’m able to find only the value on the mesh points. Thus, if I change the mesh with finer or coarser elements the value and the location that I can find change. I would like to avoid this behavior, for this reason I would get the minimum value using the interpolated value on the slice. do you think it's possible to do it? can I manage this with a programmable filter (work from script without gui)? Best Regards, Andrea From: Mathieu Westphal [mailto:[email protected]<mailto:[email protected]>] Sent: Thursday, May 03, 2018 09:07 To: Caffagni, Andrea Cc: [email protected]<mailto:[email protected]> Subject: Re: [Paraview] find minimum on a slice using interpolated values Hi Andrea, If your are using ParaView, you can obtain this information quite easilly by showing your dataset in a Spreadsheet view and orderinng the data by "Pressure". Best, Mathieu Westphal On Wed, May 2, 2018 at 8:57 PM, Caffagni, Andrea <[email protected]<mailto:[email protected]>> wrote: Dear users, I need to find the absolute minimum value on a slice of a certain scalar (like pressure). I would get this point using the interpolation in order to avoid the ‘sensitivity’ to the mesh (in this way, theoretically, if I change the mesh the minimum should always remain at the same point). For this point I would like to get the three-dimensional position and the value of the scalar in question (pressure and/or velocity), maybe I can use the numpy functions in a programmable filter? https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.amin.html But I have not idea of how use the interpolation… Thanks for the suggestions, Andrea _________________________________________________________________________________________________________________ Questo messaggio è da intendersi esclusivamente ad uso del destinatario e può contenere informazioni che sono di natura privilegiata, confidenziale o non divulgabile secondo le leggi vigenti. 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Se il lettore del presente messaggio non è il destinatario designato, o il dipendente/agente responsabile per la consegna del messaggio al destinatario designato, si informa che ogni disseminazione, distribuzione o copiatura di questa comunicazione è vietata anche ai sensi della normativa vigente in materia di protezione dei dati personali. Se avete ricevuto questo messaggio per errore, vi preghiamo di notificarcelo immediatamente a mezzo e-mail di risposta e successivamente di procedere alla cancellazione di questa e-mail e relativi allegati dal vostro sistema. _________________________________________________________________________________________________________________ This message is intended only for the use of the addressee and may contain information that is privileged, confidential and exempt from disclosure under applicable law. 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If you have received this e-mail by mistake, please notify us immediately by return e-mail and delete this e-mail and all attachments from your system. _________________________________________________________________________________________________________________ _______________________________________________ Powered by www.kitware.com<http://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: https://public.kitware.com/mailman/listinfo/paraview -- Cory Quammen Staff R&D Engineer Kitware, Inc. _________________________________________________________________________________________________________________ Questo messaggio è da intendersi esclusivamente ad uso del destinatario e può contenere informazioni che sono di natura privilegiata, confidenziale o non divulgabile secondo le leggi vigenti. 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