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
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
Turning on the "Use Continuous Cell Range Option", which means cells will be considered as continous intervals, rather than discrete set.
Setting the lower and upper threshold to be equal to the desired contour value