Add the ability to select cells crossing a contour value
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
Given a contour value, we would like the ability to select all cells whose scalar ranges cross a contour value---equivalently, the cells containing the iso-surface.
The proposed solution is to provide the functionality in the threshold filter. Currently, threshold filter has the ability to choose cells whose vertices fall in a threshold range. We will extend it---by providing a boolean option---so that it can choose cells whose scalar ranges are intersected by the threshold range. The user can then get the desired output by
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Turning off the "AllScalars" option, which means that rather than requiring the entire cell scalar range to be contained in the threshold, only intersection is required
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Turning on the "Use Continuous Cell Range Option", which means cells will be considered as continous intervals, rather than discrete set.
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Setting the lower and upper threshold to be equal to the desired contour value