Fix node ordering

Corrected pyramid node ordering
Added calculation of node ordering for tetrahedron.

Source/Mesh/mesh.cpp

@@ -1420,13 +1420,13 @@ namespace INMOST
 				}
 				ElementArray<Node> base_nodes = quad->getNodes();
 				if( quad->BackCell() == c )
-					for(ElementArray<Node>::iterator it = base_nodes.begin(); it != base_nodes.end(); it++)
+					for(ElementArray<Node>::reverse_iterator it = base_nodes.rbegin(); it != base_nodes.rend(); it++)
 					{
 						ret.push_back(*it);
 						it->SetPrivateMarker(mrk);
 					}
 				else
-					for(ElementArray<Node>::reverse_iterator it = base_nodes.rbegin(); it != base_nodes.rend(); it++)
+					for(ElementArray<Node>::iterator it = base_nodes.begin(); it != base_nodes.end(); it++)
 					{
 						ret.push_back(*it);
 						it->SetPrivateMarker(mrk);
@@ -1445,6 +1445,43 @@ namespace INMOST
 				ReleasePrivateMarker(mrk);
 				break;
 			}
+			/*
+			  3
+			 2
+			 0 1
+			 */
+			case Element::Tet:
+			{
+				ret.reserve(4);
+				MarkerType mrk = CreatePrivateMarker();
+				ElementArray<Face> faces = c->getFaces();
+				ElementArray<Node> base_nodes = faces[0]->getNodes();
+				if( faces[0]->BackCell() == c )
+					for(ElementArray<Node>::reverse_iterator it = base_nodes.rbegin(); it != base_nodes.rend(); it++)
+					{
+						ret.push_back(*it);
+						it->SetPrivateMarker(mrk);
+					}
+				else
+					for(ElementArray<Node>::iterator it = base_nodes.begin(); it != base_nodes.end(); it++)
+					{
+						ret.push_back(*it);
+						it->SetPrivateMarker(mrk);
+					}
+				ElementArray<Node> tri_nodes = faces[1]->getNodes();
+				for(ElementArray<Node>::iterator it = tri_nodes.begin(); it != tri_nodes.end(); it++)
+				{
+					if( !it->GetPrivateMarker(mrk) )
+					{
+						ret.push_back(*it);
+						break;
+					}
+				}
+				for(ElementArray<Node>::iterator it = ret.begin(); it != ret.end(); it++)
+					it->RemPrivateMarker(mrk);
+				ReleasePrivateMarker(mrk);
+				break;
+			}
 			default: //Tet, MultiPolygon, Polyhedron
 			{
 				MarkerType mrk = CreatePrivateMarker();