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<div>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). </div>
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<div>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. <br>
<br>
<div>-Ken</div>
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Sent from my iPad so blame autocorrect.</div>
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On Dec 24, 2014, at 6:50 PM, Scott, W Alan <<a href="mailto:wascott@sandia.gov">wascott@sandia.gov</a>> wrote:<br>
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<div>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).</div>
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<div>Thanks,</div>
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<div>Alan</div>
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<div><font size="2"><span style="font-size:10pt;">--------------------------------------------------------</span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;">W. Alan Scott</span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;">ParaView Support Manager</span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;"> </span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;">SAIC</span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;">Sandia National Laboratories, MS 0822</span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;">Org 9326 - Building 880 A1-C</span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;">(505) 284-0932 FAX (505) 284-5619</span></font></div>
<div><font face="Arial" size="2"><span style="font-size:10pt;">---------------------------------------------------------</span></font></div>
<div> </div>
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