diff --git a/SCHNApps/CMakeLists.txt b/SCHNApps/CMakeLists.txt
index 5505de2587421e2f4907e7acd14789cfedb4058d..ca14e4a3cc8b6aad531e396b391dfca7829e71b6 100644
--- a/SCHNApps/CMakeLists.txt
+++ b/SCHNApps/CMakeLists.txt
@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 2.8)
 
 project(SCHNApps)
 
+SET( QT_USE_QTOPENGL TRUE )
 SET( QT_USE_QTXML TRUE )
 SET( QT_USE_QTDESIGNER TRUE )
 SET( QT_USE_QTGUI TRUE )
@@ -11,6 +12,7 @@ SET( QT_USE_QTPLUGIN TRUE )
 SET(CGoGN_ROOT_DIR ${CMAKE_SOURCE_DIR}/.. CACHE STRING "CGoGN root dir")
 INCLUDE(${CGoGN_ROOT_DIR}/apps_cmake.txt)
 
+find_package(Qt4 REQUIRED)
 
 #=======QGLViewer=========#
 find_package(QGLViewer REQUIRED)
diff --git a/include/Topology/generic/genericmap.hpp b/include/Topology/generic/genericmap.hpp
index 8b95811ac9b30ac4425f1366372e58d6d910f69d..1fb4425c45d5eb41ca06a9c754a03b3d624ccdfb 100644
--- a/include/Topology/generic/genericmap.hpp
+++ b/include/Topology/generic/genericmap.hpp
@@ -538,12 +538,16 @@ void GenericMap::addEmbedding()
 	m_embeddings[ORBIT] = amv ;
 
 	FunctorInitEmb<GenericMap, ORBIT> fsetemb(*this);
-	TraversorCell<GenericMap, ORBIT> t(*this, allDarts, true) ;
-	for(Dart d = t.begin(); d != t.end(); d = t.next())
+	DartMarker dm(*this);
+	for(Dart d = this->begin(); d != this->end(); this->next(d))
 	{
-		unsigned int em = newCell<ORBIT>();
-		fsetemb.changeEmb(em);
-		foreach_dart_of_orbit<ORBIT>(d, fsetemb);
+		if(!dm.isMarked(d))
+		{
+			dm.markOrbit<ORBIT>(d);
+			unsigned int em = newCell<ORBIT>();
+			fsetemb.changeEmb(em);
+			foreach_dart_of_orbit<ORBIT>(d, fsetemb);
+		}
 	}
 }
 
diff --git a/src/Topology/generic/genericmap.cpp b/src/Topology/generic/genericmap.cpp
index 6873803b8a3307d557602e61c8cac717a0730012..3567458c1d473c2509bdaa19bd7601ee1afa73d3 100644
--- a/src/Topology/generic/genericmap.cpp
+++ b/src/Topology/generic/genericmap.cpp
@@ -40,8 +40,6 @@ GenericMap::GenericMap() : m_nbThreads(1)
 {
 	if(m_attributes_registry_map == NULL)
 	{
-		std::cout << "INITIALIZE REGISTRY MAP" << std::endl;
-
 		m_attributes_registry_map = new std::map<std::string, RegisteredBaseAttribute*>;
 
 		// register all known types