[Paraview] Gradient filters

[Scott, W Alan]

Thanks, and excellent suggestions.  I will write these output window features up.

Alan

From: Moreland, Kenneth
Sent: Wednesday, December 31, 2014 12:01 PM
To: Scott, W Alan
Cc: paraview at paraview.org
Subject: Re: [Paraview] Gradient filters

The gradient filter works specifically on image-based data. (An AMR grid is essentially a hierarchy of image data.) It computes the gradient by taking differences in the x, y, and z directions of the grid. The unstructured gradient filter makes no such assumption about the directionality of the edges. Instead, it computes the gradients within the cells and averages the results. The intention is to get valid results on unstructured grids, but the implementation actually works on any dataset object. Thus, it will work on image-based data, but slower (and will probably give a slightly different answer).

I am guessing that the warning message you are getting is only supposed to be outputted once, but the filter is being independently executed on each block of the AMR and so gives the warning each time. Rather than fix this specific instance, it might be better to have a smarter output window that recognizes when a message is repeated and reports only once with an indicator of how many times it was raised. Now that I think about it, it would be nice if the output window also cleaned up all messages to hide some of the diagnostic information that comes with every message (like file location). That would make warnings/errors more helpful in general.
-Ken

Sent from my iPad so blame autocorrect.

On Dec 24, 2014, at 6:50 PM, Scott, W Alan <wascott at sandia.gov<mailto:wascott at sandia.gov>> wrote:
What is the difference between the Gradient and Gradient Of Unstructured Dataset filters?  The Gradient filter puts out a few million lines of warning with a structured (CTH AMR) dataset, but the Gradient of Unstructured Dataset filter seems to work fine with structured data (once again, CTH AMR data).

Thanks,

Alan

--------------------------------------------------------
W. Alan Scott
ParaView Support Manager

SAIC
Sandia National Laboratories, MS 0822
Org 9326 - Building 880 A1-C
(505) 284-0932   FAX (505) 284-5619
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