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List:       paraview
Subject:    Re: [Paraview] contour programmable filter
From:       "Favre  Jean" <jfavre () cscs ! ch>
Date:       2010-09-25 6:28:23
Message-ID: AB48A31C4EC97E498F4235B7CEF74A194D33AAABD7 () MBX00 ! d ! ethz ! ch
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Using the maximum value of any scalar field as the threshold for an isosurface will \
always give a null object. In fact, the smallest isosurface you could ever construct \
is a single triangle, intersecting 3 edges connecting one vertex greater than your \
threshold, and three other vertices below your threshold.

this is the second case in this figure: \
http://en.wikipedia.org/wiki/File:MarchingCubes.svg

you should rethink your strategy of using the maximum value as input threshold.

That being said, there is a much faster way to get the range (the min and maximum) of \
a scalar field from within the Pogrammable Filter. Simply use GetRange()

max = temperature.GetRange()[1]

-----------------
Jean M. Favre
Swiss National Supercomputing Center
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