Merge branch 'FixMultipleDegeneratedEdgesOnSameVertex' into 'master'

Fix multiple degenerated edges on same vertex

See merge request !97

Mesh/HighOrder.cpp

@@ -271,7 +271,7 @@ static void getEdgeVertices(GEdge *ge, MElement *ele, std::vector<MVertex*> &ve,
     else
       edgeVertices[p].insert(edgeVertices[p].end(), veEdge.rbegin(), veEdge.rend());
   }
-  else {  // Vertices already exist
+  else if (p.first != p.second) { // Vertices already exist and edge is not a degenerated edge
     Msg::Error("Edges from different entities share vertices: create a finer mesh");
   }
   ve.insert(ve.end(), veEdge.begin(), veEdge.end());

benchmarks/occ/duplicate_degenerated_edges.geo

+SetFactory("OpenCASCADE");
+
+a() = ShapeFromFile("full_sphere.brep");
+
+Mesh.Algorithm = 2;
+Mesh.Algorithm3D = 2;
+Mesh.ElementOrder = 2;
+
+lc = 5;
+Mesh.CharacteristicLengthMin = lc;
+Mesh.CharacteristicLengthMax = lc;
+Mesh 3;
+
+nbtets = Mesh.NbTetrahedra;
+If(nbtets == 0)
+  Error("No tetrahedral elements created!");
+EndIf