added FaceFauxBorder function

vcg/complex/algorithms/update/flag.h

@@ -393,6 +393,24 @@ public:
     }
   }
 
+  /// \brief Marks feature edges according to border flag.
+  /// Actually it marks as fauxedges all the non border edges,
+  ///
+  static void FaceFauxBorder(MeshType &m)
+  {
+    RequirePerFaceFlags(m);
+    RequireFFAdjacency(m);
+    //initially Nothing is faux (e.g all crease)
+    FaceClearF(m);
+    // Then mark faux only if the signed angle is the range.
+    for(FaceIterator fi=m.face.begin();fi!=m.face.end();++fi) if(!(*fi).IsD())
+    {
+      for(int z=0;z<(*fi).VN();++z)
+      {
+        if(!face::IsBorder(*fi,z) ) (*fi).SetF(z);
+      }
+    }
+  }
 
   /// \brief Marks feature edges according to a given angle
   /// Actually it marks as fauxedges all the non feature edges,