--- /dev/null
+# Belong to Plane
+
+# create mesh
+from SMESH_mechanic import *
+# create plane
+import geompy
+plane_1 = geompy.MakePlane(p3,seg1,2000)
+geompy.addToStudy(plane_1, "plane_1")
+# get all nodes which lie on the plane \a plane_1
+filter = smesh.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)