Range 'Smart regions' option in FLAC GUI

When specifying material properties or some initial conditions, you may choose to use the ‘region’ option,
however, in some models, the attach/interface lines can introduce discontinuities for the regions.
If the same material properties or condition are to be assigned across those lines, then
‘Range smart regions’ option in the FILE/Preference settings should be checked, as shown below.


Otherwise, if same material properties or initial conditions are different across those lines, this option should be unchecked.