[Paraview] contour programmable filter

[Favre Jean]

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]

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Jean M. Favre
Swiss National Supercomputing Center