-section "Step 5 : openclose"
-option "openclose" - "Final OpenClose" flag off
-option "opencloseRadius" - "Final OpenClose radius" int no default="1"
+section "Step 5 : [optional] openclose"
+option "openclose" - "Perform an OpenClose operation" flag off
+option "opencloseRadius" - "OpenClose radius" int no default="1"
+
+section "Step 6 : fill holes"
+option "doNotFillHoles" - "Do not fill holes if set" flag on
+option "dir" d "Directions (axes) to perform filling (defaults to 2,1,0)" int multiple no
+