diff --git a/Apps/Examples/viewer.cpp b/Apps/Examples/viewer.cpp
index 2d8cd2188fe97788e20a35440857b2f3648c7a1c..f1efb9c1bfc69d2ed02124cc8ad66ecf76a151d6 100644
--- a/Apps/Examples/viewer.cpp
+++ b/Apps/Examples/viewer.cpp
@@ -309,6 +309,21 @@ void Viewer::slot_normalsSize(int i)
 	updateGL() ;
 }
 
+void Viewer::cb_keyPress(int keycode)
+{
+    switch(keycode)
+    {
+    	case 'c' :
+    		myMap.check();
+    		break;
+    	default:
+    		break;
+    }
+
+    updateGLMatrices() ;
+    updateGL();
+}
+
 /**********************************************************************************************
  *                                      MAIN FUNCTION                                         *
  **********************************************************************************************/
diff --git a/Apps/Examples/viewer.h b/Apps/Examples/viewer.h
index acf39dc619813171150158c591a929967b75d0bb..a9b477f3ce85db8c7effe408b074743cbd2618cf 100644
--- a/Apps/Examples/viewer.h
+++ b/Apps/Examples/viewer.h
@@ -117,6 +117,8 @@ public:
 	void cb_Open() ;
 	void cb_Save() ;
 
+	void cb_keyPress(int keycode);
+
 	void importMesh(std::string& filename) ;
 	void exportMesh(std::string& filename, bool askExportMode = true);
 
diff --git a/Apps/Examples/volumeExplorer.cpp b/Apps/Examples/volumeExplorer.cpp
index 5e9a5951d273a3ec66de6ad32db98646bdc606d5..d63502658e0f90beb8afc7eb52da3c37d4ae3bef 100644
--- a/Apps/Examples/volumeExplorer.cpp
+++ b/Apps/Examples/volumeExplorer.cpp
@@ -319,6 +319,18 @@ int main(int argc, char **argv)
 				position = myMap.getAttribute<PFP::VEC3>(VERTEX , attrNames[0]) ;
 		}
 
+		if(extension == std::string(".node"))
+		{
+			if(!Algo::Import::importMeshV<PFP>(myMap, argv[1], attrNames, Algo::Import::ImportVolumique::NODE))
+			{
+				std::cerr << "could not import " << argv[1] << std::endl ;
+				return 1;
+			}
+			else
+				position = myMap.getAttribute<PFP::VEC3>(VERTEX , attrNames[0]) ;
+		}
+
+
 		if(extension == std::string(".off"))
 		{
 			if(!Algo::Import::importMeshToExtrude<PFP>(myMap, argv[1], attrNames))
diff --git a/Apps/Tuto/tuto_oper2.cpp b/Apps/Tuto/tuto_oper2.cpp
index 10be95efceff872d232c617b0f5f7943e503f7d3..df155006fd89e9e7495a0c3982c0856539eedbc2 100644
--- a/Apps/Tuto/tuto_oper2.cpp
+++ b/Apps/Tuto/tuto_oper2.cpp
@@ -74,7 +74,7 @@ void MyQT::operation(int x)
 			PFP::VEC3 c1 = Algo::Geometry::faceCentroid<PFP>(myMap, m_selected, position);
 			PFP::VEC3 c2 = Algo::Geometry::faceCentroid<PFP>(myMap, m_selected2, position);
 			position[m_selected] = position[m_selected] * 0.7f + c1*0.3f;
-			position[m_selected2] = position[m_selected2] * 0.7f + c2*0.3f;
+			position[m_selected2] = position[m_sel	ected2] * 0.7f + c2*0.3f;
 			updateMap();
 		}
 		break;
diff --git a/Apps/Tuto/tuto_oper3.cpp b/Apps/Tuto/tuto_oper3.cpp
index 1fae0e5fa176c1953221b6f2796e44dc6484a5a8..22921b85d77c4498eeaf878e6bcc9a0e1a413d4a 100644
--- a/Apps/Tuto/tuto_oper3.cpp
+++ b/Apps/Tuto/tuto_oper3.cpp
@@ -27,6 +27,7 @@
 #include "Algo/Modelisation/polyhedron.h"
 #include "Algo/Modelisation/primitives3d.h"
 #include "Algo/Geometry/centroid.h"
+#include "Algo/Geometry/normal.h"
 #include "Algo/Import/import.h"
 #include "Algo/Export/export.h"
 
@@ -177,6 +178,18 @@ void MyQT::operation(int x)
 			updateMap();
 		}
 		break;
+	case 10:
+		CGoGNout <<"split vertex"<<CGoGNendl;
+		if(m_selected != NIL && m_selected2 != NIL)
+		{
+			PFP::VEC3 c1 = Algo::Geometry::faceCentroid<PFP>(myMap, myMap.findBoundaryFaceOfEdge(m_selected), position);
+			PFP::VEC3 c2 = Algo::Geometry::faceCentroid<PFP>(myMap, myMap.findBoundaryFaceOfEdge(m_selected2), position);
+			myMap.splitVertex(m_selected, m_selected2);
+			position[m_selected] = position[m_selected] * 0.7f + c1*0.3f;
+			position[m_selected2] = position[m_selected2] * 0.7f + c2*0.3f;
+			updateMap();
+		}
+		break;
 	default:
 		break;
 	}
diff --git a/Apps/Tuto/tuto_oper3.ui b/Apps/Tuto/tuto_oper3.ui
index 769ec884f7a2b7d50e0531fa388e26c51ddb4bc1..67ff27fff4689833b26b150f63ec823bef663056 100644
--- a/Apps/Tuto/tuto_oper3.ui
+++ b/Apps/Tuto/tuto_oper3.ui
@@ -99,6 +99,11 @@
           <string>collapseVolume</string>
          </property>
         </item>
+        <item>
+         <property name="text">
+          <string>splitVertex</string>
+         </property>
+        </item>
        </widget>
       </item>
       <item>
diff --git a/include/Topology/map/embeddedMap3.h b/include/Topology/map/embeddedMap3.h
index e1d816b3fb31fc655bb5262b4eecb4bc6ad95c25..bac9463e34e5fcc23ab141828b23e3f88b275e50 100644
--- a/include/Topology/map/embeddedMap3.h
+++ b/include/Topology/map/embeddedMap3.h
@@ -37,6 +37,12 @@ class EmbeddedMap3 : public Map3
 public:
 	typedef Map3 TOPO_MAP;
 
+	//!
+	/*!
+	 *
+	 */
+	virtual void splitVertex(Dart d, Dart e);
+
 	//!
 	/*!
 	 */
diff --git a/include/Topology/map/map2MR/filters_Primal.h b/include/Topology/map/map2MR/filters_Primal.h
index 306a83c26eb8038182e9cafb57bafce6c503597a..b59e2ec9db935322a8dc6371a92fa03c8e456ef2 100644
--- a/include/Topology/map/map2MR/filters_Primal.h
+++ b/include/Topology/map/map2MR/filters_Primal.h
@@ -546,6 +546,31 @@ public:
 	}
 } ;
 
+/*********************************************************************************
+ *                           PROGRESSIVE MESHES FUNCTORS
+ *********************************************************************************/
+template <typename PFP>
+class pipoPMAnalysisFilter
+{
+protected:
+	typename PFP::MAP& m_map;
+	typename PFP::TVEC3& m_position;
+	//Algo::PMesh::ProgressiveMesh<PFP> *m_pmesh;
+
+public:
+	pipoPMAnalysisFilter(typename PFP::MAP& m, typename PFP::TVEC3& p) : m_map(m), m_position(p)
+	{}
+
+	bool operator() ()
+	{
+		for(Dart dit = m_map.begin() ; dit != m_map.end() ; dit = m_map.next())
+		{
+			return false;
+		}
+	}
+};
+
+
 } // namespace Multiresolution
 
 } // namespace CGoGN
diff --git a/include/Topology/map/map2MR/map2MR_PM.h b/include/Topology/map/map2MR/map2MR_PM.h
index 7bf470c2302da4b85d0e5bd2b4f36fdf43f5dd16..da37650c45f8da1cccd1ae43a1ff22ee6ff2f78d 100644
--- a/include/Topology/map/map2MR/map2MR_PM.h
+++ b/include/Topology/map/map2MR/map2MR_PM.h
@@ -60,6 +60,8 @@ public:
 	Map2MR_PM() ;
 
 	virtual std::string mapTypeName() const { return "Map2MR_PM" ; }
+
+	//add a coarse level
 	void addNewLevel(bool embedNewVertices = true) ;
 
 	void addSynthesisFilter(Multiresolution::MRFilter* f) { synthesisFilters.push_back(f) ; }
diff --git a/include/Topology/map/map3.h b/include/Topology/map/map3.h
index bc6375c52663af274721dadb58409b04948e86f6..138302538e1b8507e89689113dc4b6c9df7ef555 100644
--- a/include/Topology/map/map3.h
+++ b/include/Topology/map/map3.h
@@ -137,6 +137,15 @@ public:
 	 *************************************************************************/
 
 	//@{
+	//! Split the vertex
+	/*! \per Darts d & e MUST belong to the same vertex
+	 * 	\per Darts d & e MUST belong to different volumes
+	 *  \per Works only on the boundary
+	 *  @param d first dart in vertex v
+	 *	@param e second dart in vertex v
+	 */
+	virtual void splitVertex(Dart d, Dart e);
+
 	//! Delete the vertex of d
 	/*! All the volumes around the vertex are merged into one volume
 	 *  @param d a dart of the vertex to delete
diff --git a/src/Topology/map/embeddedMap3.cpp b/src/Topology/map/embeddedMap3.cpp
index e87a738559725d0d4926b22c0761972d1ff473c6..775b70dc613575f44a26fab0e081a207d5e49dab 100644
--- a/src/Topology/map/embeddedMap3.cpp
+++ b/src/Topology/map/embeddedMap3.cpp
@@ -27,6 +27,30 @@
 namespace CGoGN
 {
 
+void EmbeddedMap3::splitVertex(Dart d, Dart e)
+{
+
+	Map3::splitVertex(d, e);
+
+	if(isOrbitEmbedded(VERTEX))
+	{
+		embedOrbit(VERTEX, d, getEmbedding(VERTEX, d));
+		embedNewCell(VERTEX, phi2(phi1(phi2(d))));
+		copyCell(VERTEX, phi2(phi1(phi2(d))), d);
+	}
+
+	if(isOrbitEmbedded(EDGE))
+	{
+
+	}
+
+	if(isOrbitEmbedded(VOLUME))
+	{
+		embedOrbit(VOLUME, d, getEmbedding(VOLUME, d)) ;
+		embedOrbit(VOLUME, e, getEmbedding(VOLUME, e)) ;
+	}
+}
+
 Dart EmbeddedMap3::deleteVertex(Dart d)
 {
 	Dart v = Map3::deleteVertex(d) ;
diff --git a/src/Topology/map/map2.cpp b/src/Topology/map/map2.cpp
index 11131528c4e67ea6036ca23cf3e97ef310356d43..70d93791a2b84775b7ccf8c45b980495ed74526b 100644
--- a/src/Topology/map/map2.cpp
+++ b/src/Topology/map/map2.cpp
@@ -196,7 +196,7 @@ void Map2::fillHole(Dart d)
 
 void Map2::splitVertex(Dart d, Dart e)
 {
-	assert(sameOrientedVertex(d, e)) ;
+	assert(sameVertex(d, e)) ;
 	Dart d2 = phi2(d) ; assert(d != d2) ;
 	Dart e2 = phi2(e) ; assert(e != e2) ;
 	Dart nd = Map1::cutEdge(d2) ;	// Cut the edge of dd (make a new half edge)
diff --git a/src/Topology/map/map3.cpp b/src/Topology/map/map3.cpp
index c1b8c36ca5d46fbeb9963d5c9c40c6b31f6399ed..6f789361ca797adb84069c5a948039860498f4bb 100644
--- a/src/Topology/map/map3.cpp
+++ b/src/Topology/map/map3.cpp
@@ -129,6 +129,30 @@ void Map3::fillHole(Dart d)
  *  Topological operations on 3-maps
  *************************************************************************/
 
+void Map3::splitVertex(Dart d, Dart e)
+{
+	assert(sameVertex(d,e));
+	assert(!sameVolume(d,e));
+
+	if(isBoundaryVertex(d))
+	{
+		unsewVolumes(d);
+		unsewVolumes(e);
+
+		Dart dc = phi1(phi2(d));
+
+		//unsewVolumes(phi2(dc));
+		Map2::splitVertex(d, phi1(phi2(dc)));
+
+
+//		Map2::splitFace(d, phi2(dc));
+
+//		Dart ec = phi_1(phi2(e));
+//		Map2::splitVertex(e, ec);
+//		//Map2::splitFace(e, phi2(ec));
+	}
+}
+
 Dart Map3::deleteVertex(Dart d)
 {
 	if(isBoundaryVertex(d))