UGGridRenumberer: Add faceEdgeDUNEtoUG and faceVertexDUNEtoUG

dune/grid/uggrid/uggridrenumberer.hh

@@ -412,6 +412,46 @@ namespace Dune {
       return i;
     }
 
+    /** \brief For a given element side, renumber subvertex numbers
+     * from Dune numbering to UG numbering
+     */
+    static int faceVertexDUNEtoUG(GeometryType element, int side, int subVertex)
+    {
+      const auto refElement = referenceElement<double,3>(element);
+
+      const auto sideType = refElement.type(facesUGtoDUNE(side,element),1);
+
+      if (sideType.isTriangle())
+        return subVertex;
+
+      // If it's not a triangle it must be a quadrilateral
+      const int renumbering[4] = {0, 1, 3, 2};
+      return renumbering[subVertex];
+
+    }
+
+
+    /** \brief For a given element side, renumber subedge numbers
+     * from Dune numbering to UG numbering
+     */
+    static int faceEdgeDUNEtoUG(GeometryType element, int side, int subEdge)
+    {
+      const auto refElement = referenceElement<double,3>(element);
+
+      const auto sideType = refElement.type(facesUGtoDUNE(side,element),1);
+
+      if (sideType.isTriangle())
+      {
+        constexpr int renumbering[3] = {0, 2, 1};
+        return renumbering[subEdge];
+      }
+
+      // If it's not a triangle it must be a quadrilateral
+      constexpr int renumbering[4] = {2, 1, 3, 0};
+      return renumbering[subEdge];
+
+    }
+
   };
 }