diff --git a/Apps/Examples/miniTest.cpp b/Apps/Examples/miniTest.cpp
index fabf2abf50becc6bca39ab1b2e2f0ad4a717eb0c..d7d47d98e6a2a522b3ea9861fc32b3c4c134d134 100644
--- a/Apps/Examples/miniTest.cpp
+++ b/Apps/Examples/miniTest.cpp
@@ -668,6 +668,31 @@ void MyGlutWin::myKeyboard(unsigned char keycode, int x, int y)
 			break ;
 		}
 
+		case '0':
+		{
+
+			GLint t1 = glutGet(GLUT_ELAPSED_TIME) ;
+
+			Algo::Modelisation::reverseOrientation<PFP>(myMap) ;
+
+			GLint t2 = glutGet(GLUT_ELAPSED_TIME) ;
+			GLfloat seconds = (t2 - t1) / 1000.0f ;
+			std::cout << "pliant remeshing: "<< seconds << "sec" << std::endl ;
+
+			t1 = glutGet(GLUT_ELAPSED_TIME) ;
+
+			updateVBOprimitives(Algo::Render::VBO::TRIANGLES | Algo::Render::VBO::LINES | Algo::Render::VBO::POINTS) ;
+			updateVBOdata(Algo::Render::VBO::POSITIONS | Algo::Render::VBO::NORMALS) ;
+			topo_render->updateData<PFP>(myMap, position, 0.9f, 0.9f) ;
+
+			t2 = glutGet(GLUT_ELAPSED_TIME) ;
+			seconds = (t2 - t1) / 1000.0f ;
+			std::cout << "display update: "<< seconds << "sec" << std::endl ;
+
+			glutPostRedisplay() ;
+			break ;
+		}
+
 		case '9':
 		{
 			CellMarker markVisit(myMap, VERTEX_CELL) ;
diff --git a/include/Algo/Geometry/normal.hpp b/include/Algo/Geometry/normal.hpp
index e2f340d26c3730576ef265151c45d63402dfa80e..816172d214d53b24492f5087525fb434cd4ed53f 100644
--- a/include/Algo/Geometry/normal.hpp
+++ b/include/Algo/Geometry/normal.hpp
@@ -64,8 +64,8 @@ typename PFP::VEC3 faceNormal(typename PFP::MAP& map, Dart d, const typename PFP
 		do
 		{
 			VEC3 n = triangleNormal<PFP>(map, it, position) ;
-			//if(!std::isnan(n[0]))
-			if (n[0] == n[0])
+			//if(!std::isnan(n[0]) && !std::isnan(n[1]) && !std::isnan(n[2]))
+			if (n[0] == n[0] && n[1] == n[1] && n[2] == n[2])
 				N += n ;
 			it = map.phi1(it) ;
 		} while (it != d) ;
diff --git a/include/Geometry/vector_gen.hpp b/include/Geometry/vector_gen.hpp
index db3de8774a6e8de7da21cd5f4bfc066aa8806d74..fa89bb317c750b07a3c2fb4645c6fc46bdaefa8d 100644
--- a/include/Geometry/vector_gen.hpp
+++ b/include/Geometry/vector_gen.hpp
@@ -280,7 +280,7 @@ template <unsigned int DIM, typename T>
 inline bool Vector<DIM,T>::hasNan() const
 {
 	for(unsigned int i = 0 ; i < DIM ; ++i)
-		if(isnan(m_data[i]))
+		if(m_data[i] != m_data[i])
 			return true ;
 	return false ;
 }