+# Belong to Plane
+
+# create mesh
+from mechanic import *
+
+# create plane
+plane_1 = geom_builder.MakePlane(p3,seg1,2000)
+geom_builder.addToStudy(plane_1, "plane_1")
+
+# get all nodes which lie on the plane \a plane_1
+filter = smesh_builder.GetFilter(SMESH.NODE, SMESH.FT_BelongToPlane, plane_1)
+ids = mesh.GetIdsFromFilter(filter)
+print("Number of nodes which lie on the plane plane_1:", len(ids))
