diff --git a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
index 36d6849595..4cb598c575 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
@@ -782,8 +782,8 @@ void ViewProviderFEMMeshBuilder::createMesh(const App::Property* prop,
                 BndBox.Add(facesHelper[i++].set(4, aFace, aFace->GetID(), 0, aFace->GetNode(0), aFace->GetNode(1), aFace->GetNode(2), aFace->GetNode(3)));
                 break;
             case 6:
-                //tria6 face = N1, N2, N3, N4, N5, N6
-                BndBox.Add(facesHelper[i++].set(6, aFace, aFace->GetID(), 0, aFace->GetNode(0), aFace->GetNode(1), aFace->GetNode(2), aFace->GetNode(3), aFace->GetNode(4), aFace->GetNode(5)));
+                //tria6 face = N1, N4, N2, N5, N3, N6
+                BndBox.Add(facesHelper[i++].set(6, aFace, aFace->GetID(), 0, aFace->GetNode(0), aFace->GetNode(3), aFace->GetNode(1), aFace->GetNode(4), aFace->GetNode(2), aFace->GetNode(5)));
                 break;
             case 8:
                 //quad8 face = N1, N2, N3, N4, N5, N6, N7, N8
@@ -1221,50 +1221,51 @@ void ViewProviderFEMMeshBuilder::createMesh(const App::Property* prop,
                     break;
                 // 6 nodes
                 case 6:
+                    // tria6 face
                     Base::Console().Log("    %f: Start build up triangle vector for 6 nodes object\n",Base::TimeInfo::diffTimeF(Start,Base::TimeInfo()));
                     Base::Console().Log("    NumNodes:%i\n",facesHelper[l].Element->NbNodes());
                     switch (facesHelper[l].FaceNo){
-                        case 0: { // tria6 face
+                        case 0: { // tria6 face, 6-node triangle
                             Base::Console().Log("    %f: Start build up triangle vector for tria6 face\n",Base::TimeInfo::diffTimeF(Start,Base::TimeInfo()));
                             Base::Console().Log("    NumNodes:%i\n",facesHelper[l].Element->NbNodes());
                             // prefeche all node indexes of this face
                             int nIdx0 = mapNodeIndex[facesHelper[l].Element->GetNode(0)];
-                            int nIdx1 = mapNodeIndex[facesHelper[l].Element->GetNode(1)];
-                            int nIdx2 = mapNodeIndex[facesHelper[l].Element->GetNode(2)];
-                            int nIdx3 = mapNodeIndex[facesHelper[l].Element->GetNode(3)];
-                            int nIdx4 = mapNodeIndex[facesHelper[l].Element->GetNode(4)];
+                            int nIdx1 = mapNodeIndex[facesHelper[l].Element->GetNode(3)];
+                            int nIdx2 = mapNodeIndex[facesHelper[l].Element->GetNode(1)];
+                            int nIdx3 = mapNodeIndex[facesHelper[l].Element->GetNode(4)];
+                            int nIdx4 = mapNodeIndex[facesHelper[l].Element->GetNode(2)];
                             int nIdx5 = mapNodeIndex[facesHelper[l].Element->GetNode(5)];
                             // create triangle number 1 ----------------------------------------------
                             // fill in the node indexes in CLOCKWISE order
-                            indices[index++] = nIdx0;
-                            indices[index++] = nIdx3;
                             indices[index++] = nIdx5;
+                            indices[index++] = nIdx0;
+                            indices[index++] = nIdx1;
                             indices[index++] = SO_END_FACE_INDEX;
                             // add the two edge segments for that triangle
-                            insEdgeVec(EdgeMap, nIdx0, nIdx3);
-                            insEdgeVec(EdgeMap, nIdx0, nIdx5);
+                            insEdgeVec(EdgeMap, nIdx5, nIdx0);
+                            insEdgeVec(EdgeMap, nIdx0, nIdx1);
                             // rember the element and face number for that triangle
-                            vFaceElementIdx[indexIdx++] = ElemFold(facesHelper[l].ElementNumber, 0);
+                            vFaceElementIdx[indexIdx++] = ElemFold(facesHelper[l].ElementNumber,0);
                             // create triangle number 2 ----------------------------------------------
-                            indices[index++] = nIdx3;
                             indices[index++] = nIdx1;
-                            indices[index++] = nIdx4;
-                            indices[index++] = SO_END_FACE_INDEX;
-                            insEdgeVec(EdgeMap, nIdx3, nIdx1);
-                            insEdgeVec(EdgeMap, nIdx1, nIdx4);
-                            vFaceElementIdx[indexIdx++] = ElemFold(facesHelper[l].ElementNumber, 0);
-                            // create triangle number 3 ----------------------------------------------
-                            indices[index++] = nIdx4;
                             indices[index++] = nIdx2;
-                            indices[index++] = nIdx5;
+                            indices[index++] = nIdx3;
                             indices[index++] = SO_END_FACE_INDEX;
-                            insEdgeVec(EdgeMap, nIdx4, nIdx2);
-                            insEdgeVec(EdgeMap, nIdx2, nIdx5);
-                            vFaceElementIdx[indexIdx++] = ElemFold(facesHelper[l].ElementNumber, 0);
-                            // create triangle number 4 ----------------------------------------------
-                            indices[index++] = nIdx5;
+                            insEdgeVec(EdgeMap, nIdx1, nIdx2);
+                            insEdgeVec(EdgeMap, nIdx2, nIdx3);
+                            vFaceElementIdx[indexIdx++] = ElemFold(facesHelper[l].ElementNumber,0);
+                            // create triangle number 3 ----------------------------------------------
                             indices[index++] = nIdx3;
                             indices[index++] = nIdx4;
+                            indices[index++] = nIdx5;
+                            indices[index++] = SO_END_FACE_INDEX;
+                            insEdgeVec(EdgeMap, nIdx3, nIdx4);
+                            insEdgeVec(EdgeMap, nIdx4, nIdx5);
+                            vFaceElementIdx[indexIdx++] = ElemFold(facesHelper[l].ElementNumber,0);
+                            // create triangle number 4 ----------------------------------------------
+                            indices[index++] = nIdx1;
+                            indices[index++] = nIdx3;
+                            indices[index++] = nIdx5;
                             indices[index++] = SO_END_FACE_INDEX;
                             // this triangle has no edge (inner triangle).
                             break;    }