smesh/doc/examples/grouping_elements_ex07.py

# Cut of groups

from mechanic import *

# Criterion : AREA > 20
aFilter = smesh_builder.GetFilter(SMESH.FACE, SMESH.FT_Area, SMESH.FT_MoreThan, 20.)

anIds = mesh.GetIdsFromFilter(aFilter)

print("Criterion: Area > 20, Nb = ", len(anIds)) 

# create a group by adding elements with area > 20
aGroupMain = mesh.MakeGroupByIds("Area > 20", SMESH.FACE, anIds)

# Criterion : AREA < 60
aFilter = smesh_builder.GetFilter(SMESH.FACE, SMESH.FT_Area, SMESH.FT_LessThan, 60.)

anIds = mesh.GetIdsFromFilter(aFilter)

print("Criterion: Area < 60, Nb = ", len(anIds)) 

# create a group by adding elements with area < 60
aGroupTool = mesh.MakeGroupByIds("Area < 60", SMESH.FACE, anIds)
 
# create a cut of groups : area >= 60
aGroupRes = mesh.CutGroups(aGroupMain, aGroupTool, "Area >= 60")
print("Criterion: Area >= 60, Nb = ", len(aGroupRes.GetListOfID()))
# Please note that also there is CutListOfGroups() method which works with lists of groups of any lengths