IPAL54306: IMACS Support: Section of a mesh with a plane

1) add an example
2) fix a bug

doc/salome/examples/ex_MakePolyLine.py

@@ -0,0 +1,34 @@
+import salome
+salome.salome_init()
+
+### create geometry
+
+from salome.geom import geomBuilder
+geompy = geomBuilder.New(salome.myStudy)
+
+Box_1 = geompy.MakeBoxDXDYDZ(200, 200, 200)
+geompy.addToStudy( Box_1, 'Box_1' )
+
+### create a mesh
+
+import SMESH
+from salome.smesh import smeshBuilder
+smesh = smeshBuilder.New(salome.myStudy)
+
+Mesh_1 = smesh.Mesh( Box_1 )
+Mesh_1.Segment().NumberOfSegments(15)
+Mesh_1.Triangle()
+Mesh_1.Compute()
+
+# define arguments for MakePolyLine
+
+segments = []
+segments.append( SMESH.PolySegment( 20, 0, 1, 0, smesh.MakeDirStruct(0,0,0) ))
+segments.append( SMESH.PolySegment( 1, 0, 200, 0, smesh.MakeDirStruct(0,0,0) ))
+segments.append( SMESH.PolySegment( 200, 0, 578, 577, smesh.MakeDirStruct(1,1,1) ))
+
+Mesh_1.MakePolyLine( segments, "1D group")
+
+
+if salome.sg.hasDesktop():
+  salome.sg.updateObjBrowser(True)

src/SMESH/SMESH_MeshEditor.cxx

@@ -12921,8 +12921,7 @@ namespace // utils for MakePolyLine
     {
       ok = ( myDot1 != myDot2 );
       if ( ok && myFace )
-        ok = ( myFace->GetNodeIndex( myNode1._node ) < 0 &&
+        ok = ( myFace->GetNodeIndex(( myDot1 == 0 ? myNode1 : myNode2 )._node ) < 0 );
-               myFace->GetNodeIndex( myNode2._node ) < 0 );
     }
     if ( ok )
     {