I think using Find Data would be the easiest (Edit->Find Data). Assuming Gradients is the name of the field data that you created from your first Gradient of Unstructured Data Set filter and that you're using Point Data, set values according to the the attached image. You probably can't set the gradient magnitude exactly to 0 as the gradients at the points will probably not be exactly 0 (that's why I set it to 1). Then do similar operations for the second derivatives to get rid of the local minima and saddle points. You can then extract that selection if you want to reduce your data set size.<br>
<br>Alternatively you can use the contour filter for gradients (you'll have to use the calculator filter to get the magnitude of the gradient) to get places where the gradient is 0 but not at a point.<br><br>Andy<br><br>
<div class="gmail_quote">On Tue, Feb 28, 2012 at 3:11 AM, Thomas Witkowski <span dir="ltr"><<a href="mailto:thomas.witkowski@tu-dresden.de">thomas.witkowski@tu-dresden.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
What is the simplest way to extract all local maxima of a 2D vtu data file? Okay, the first and second derivations can be easily computed with the Gradient Filter. But what's the simplest way to traverse the data and to extract all points that fulfill the corresponding conditions?<br>
<br>
Thomas<br>
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