[Paraview] How find local maxima of a scalar field in a slice

Mon Apr 16 14:56:09 EDT 2018

Dear David your point is interesting,
But unfortunately if you have a quasi-flat surface with some locals maxima, the gradient is around zero in a big surface of your domain.
For my problem seems very interesting the tool proposed by Jean:
https://topology-tool-kit.github.io/

The installation seems to be a bit tricky but I want install the software and try how it can work.

Responding to Mathieu:
I need a tool that can  run without my supervision and it can find the local maxima in an autonomous way.

As soon as possible I come back to you and share my experience.
For the moment I really thank you for your suggestions.

Best Regards,
Andrea

From: David E DeMarle [mailto:dave.demarle at kitware.com]
Sent: Monday, April 16, 2018 14:17
To: Mathieu Westphal
Cc: Caffagni, Andrea; paraview at public.kitware.com; Favre Jean
Subject: Re: [Paraview] How find local maxima of a scalar field in a slice

How about using the gradient (filter or python calculator expression) to take the derivative and find the points of inflection. Combine that with the techniques Mathieu and Jean suggested.

On Apr 16, 2018 7:53 AM, "Mathieu Westphal" <mathieu.westphal at kitware.com<mailto:mathieu.westphal at kitware.com>> wrote:
Dear Andrea,
Both Jean's and my method will not work for your case. I'll admit that I missed the local part.
The easiest way would be to do it visually with scalar coloring and use "Hover Points" or "Hover Cells" to find the exact element you are looking for.
Best,

Mathieu Westphal

On Mon, Apr 16, 2018 at 1:25 PM, Caffagni, Andrea <Andrea.Caffagni at ferrari.com<mailto:Andrea.Caffagni at ferrari.com>> wrote:
Dear Jean,
Thanks for your suggestions.
If I have understood correctly, your method can works only in the case in which I have only a maxima like this case:
https://upload.wikimedia.org/wikipedia/commons/c/ce/Gaussian_2d.png

But if I have to find the local maxima in this case:
https://www.mathworks.com/matlabcentral/mlc-downloads/downloads/submissions/27178/versions/6/previews/html/psPeaksExample.html
in which I have three different local max peaks, your method can works correctly?

Best regards,
Andrea

From: Favre Jean [mailto:jfavre at cscs.ch<mailto:jfavre at cscs.ch>]
Sent: Monday, April 16, 2018 09:38
To: Caffagni, Andrea; paraview at public.kitware.com<mailto:paraview at public.kitware.com>
Subject: RE: How find local maxima of a scalar field in a slice

use the Edit->Find Data menu

Select Points or Cells.
Select the "from" object (your slice's name)
Select the variable name
Select "is max"
Click on "Run Selection Query"
-----------------
Jean/CSCS

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