Added FaceFauxSignedCrease that Marks feature edges according to two signed dihedral angles.

vcg/complex/algorithms/update/flag.h

@@ -358,11 +358,44 @@ public:
           }
       }
   }
-  //
+
+
+  /// \brief Marks feature edges according to two signed dihedral angles.
+  /// Actually it marks as fauxedges all the non feature edges,
+  /// e.g. the edge such that the signed dihedral angle between the normal of two faces sharing it, is between the two given thresholds.
+  /// In this way all the near planar edges are marked as Faux Edges (e.g. edges to be ignored)
+  /// Note that it uses the signed dihedral angle convention (negative for concave edges and positive for convex ones);
+  static void FaceFauxSignedCrease(MeshType &m, float AngleRadNeg, float AngleRadPos )
+  {
+    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) )
+        {
+          ScalarType angle = DihedralAngleRad(*fi,z);
+          if(angle>AngleRadNeg && angle<AngleRadPos)
+            (*fi).SetF(z);
+        }
+      }
+    }
+  }
+
+
+  /// \brief Marks feature edges according to a given angle
+  /// Actually it marks as fauxedges all the non feature edges,
+  /// e.g. the edge such that the angle between the normal of two faces sharing it is less than the given threshold.
+  /// In this way all the near planar edges are marked as Faux Edges (e.g. edges to be ignored)
   static void FaceFauxCrease(MeshType &m,float AngleRad)
   {
     RequirePerFaceFlags(m);
     RequireFFAdjacency(m);
+    RequirePerFaceNormal(m);
 
     typename MeshType::FaceIterator f;