diff --git a/vcg/complex/trimesh/nring.h b/vcg/complex/trimesh/nring.h
new file mode 100644
index 00000000..73b0743b
--- /dev/null
+++ b/vcg/complex/trimesh/nring.h
@@ -0,0 +1,160 @@
+#ifndef RINGWALKER_H
+#define RINGWALKER_H
+
+/****************************************************************************
+ * VCGLib                                                            o o     *
+ * Visual and Computer Graphics Library                            o     o   *
+ *                                                                _   O  _   *
+ * Copyright(C) 2004                                                \/)\/    *
+ * Visual Computing Lab                                            /\/|      *
+ * ISTI - Italian National Research Council                           |      *
+ *                                                                    \      *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This program is free software; you can redistribute it and/or modify      *
+ * it under the terms of the GNU General Public License as published by      *
+ * the Free Software Foundation; either version 2 of the License, or         *
+ * (at your option) any later version.                                       *
+ *                                                                           *
+ * This program is distributed in the hope that it will be useful,           *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
+ * GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
+ * for more details.                                                         *
+ *                                                                           *
+ ****************************************************************************/
+
+#include <vcg/simplex/face/jumping_pos.h>
+#include <vcg/complex/trimesh/allocate.h>
+#include <vcg/complex/trimesh/update/flag.h>
+#include <vector>
+#include <set>
+
+using namespace std;
+
+namespace vcg
+{
+namespace tri 
+{
+		
+	/** \addtogroup trimesh */
+	/*@{*/
+	/*@{*/
+	/** Class Mesh.
+	 This is class for extracting n-ring of vertexes or faces, starting from a vertex of a mesh.
+	 */
+template <class MeshType>
+class Nring
+{
+public:
+
+    typedef typename MeshType::FaceType   FaceType;
+    typedef typename MeshType::VertexType VertexType;
+    typedef typename MeshType::ScalarType ScalarType;
+    typedef typename MeshType::FaceIterator FaceIterator;
+    typedef typename MeshType::VertexIterator VertexIterator;
+    typedef typename MeshType::CoordType CoordType;
+
+
+    vector<VertexType*> allV;
+    vector<FaceType*> allF;
+
+    vector<VertexType*> lastV;
+    vector<FaceType*> lastF;
+
+    MeshType* m;
+
+    RingWalker(VertexType* v, MeshType* m) : m(m)
+    {
+        assert((v - &*m->vert.begin()) < m->vert.size());
+        insertAndFlag(v);
+
+    }
+	
+    ~RingWalker()
+    {
+		clear();
+    }
+
+    void insertAndFlag1Ring(VertexType* v)
+    {
+        insertAndFlag(v);
+
+        typename vcg::face::Pos<FaceType> p(v->VFp(),v);
+        assert(p.V() == v);
+
+        int count = 0;
+        vcg::face::Pos<FaceType> ori = p;
+        do
+        {
+            insertAndFlag(p.F());
+            p.FlipF();
+            p.FlipE();
+            assert(count++ < 100);
+        } while (ori != p);
+
+    }
+
+    void insertAndFlag(FaceType* f)
+    {
+        if (!f->IsV())
+        {
+            allF.push_back(f);
+            lastF.push_back(f);
+            f->SetV();
+            insertAndFlag(f->V(0));
+            insertAndFlag(f->V(1));
+            insertAndFlag(f->V(2));
+        }
+    }
+
+    void insertAndFlag(VertexType* v)
+    {
+        if (!v->IsV())
+        {
+            allV.push_back(v);
+            lastV.push_back(v);
+            v->SetV();
+        }
+    }
+
+
+    static void clearFlags(MeshType* m)
+    {
+        vcg::tri::UpdateFlags<MeshType>::VertexClearV(*m);
+        vcg::tri::UpdateFlags<MeshType>::FaceClearV(*m);
+    }
+
+    void clear()
+    {
+        for(int i=0; i< allV.size(); ++i)
+            allV[i]->ClearV();
+        for(int i=0; i< allF.size(); ++i)
+            allF[i]->ClearV();
+
+        allV.clear();
+        allF.clear();
+    }
+
+    void expand()
+    {
+        vector<VertexType*> lastVtemp = lastV;
+
+        lastV.clear();
+        lastF.clear();
+
+        for(typename vector<VertexType*>::iterator it = lastVtemp.begin(); it != lastVtemp.end(); ++it)
+        {
+            insertAndFlag1Ring(*it);
+        }
+    }
+
+    void expand(int k)
+    {
+        for(int i=0;i<k;++i)
+            expand();
+    }
+};
+
+}} // end namespace NAMESPACE
+#endif // RINGWALKER_H