diff --git a/include/Algo/Geometry/boundingbox.h b/include/Algo/Geometry/boundingbox.h
index b8a7d844d913c12837f60f24581da08778361a22..c953e3409524c9a1a709b3bc464de074456e2025 100644
--- a/include/Algo/Geometry/boundingbox.h
+++ b/include/Algo/Geometry/boundingbox.h
@@ -27,8 +27,10 @@
 
 #include "Geometry/basic.h"
 #include "Geometry/bounding_box.h"
+#include "Topology/generic/attributeHandler.h"
 #include "Topology/generic/traversorCell.h"
 
+
 namespace CGoGN
 {
 
diff --git a/include/Utils/drawer.h b/include/Utils/drawer.h
index 56f619687bb745466d3554ab829cf028b4228dc2..a11698700298f06cb6bb643e43caa90e8b9853ef 100644
--- a/include/Utils/drawer.h
+++ b/include/Utils/drawer.h
@@ -106,13 +106,15 @@ public:
 
 	/**
 	 * use as glVertex
+	 * @return index of position for update
 	 */
-	void vertex(const Geom::Vec3f& v);
+	unsigned int vertex(const Geom::Vec3f& v);
 
 	/**
 	 * use as glVertex
+	 * @return index of position for update
 	 */
-	void vertex3f(float x, float y, float z);
+	unsigned int vertex3f(float x, float y, float z);
 
 	/**
 	 * use as glColor
@@ -139,6 +141,22 @@ public:
 	 */
 	void pointSize(float ps);
 
+	/**
+	 * update position of VBO of drawer
+	 * @param first index of vertex to update
+	 * @param nb number of vertex tp update
+	 * @param P ptr to table of vertices
+	 */
+	void updatePositions(unsigned int first, unsigned int nb, const Geom::Vec3f* P);
+
+	/**
+	 * update position of VBO of drawer
+	 * @param first index of vertex to update
+	 * @param nb number of vertex tp update
+	 * @param P ptr to table of vertices
+	 */
+	void updatePositions(unsigned int first, unsigned int nb, const float* P);
+
 	/**
 	 * rendering in svg struct
 	 */
diff --git a/include/Utils/gl_matrices.h b/include/Utils/gl_matrices.h
index 021c11062fb33bf21961ee008bd3d8e1b8066223..3f01488089c5757ac79c5e37ff37a652ceda118a 100644
--- a/include/Utils/gl_matrices.h
+++ b/include/Utils/gl_matrices.h
@@ -52,12 +52,18 @@ public:
 
 	void popTransfo()
 	{
-			if (m_stack.empty()) return;
+		if (m_stack.empty())
+			return;
 		m_matrices[2] = m_stack.top();
 		m_stack.pop();
 	}
 
-	glm::mat4 getTransfo() const
+	const glm::mat4&  getTransfo() const
+	{
+		return m_matrices[2];
+	}
+
+	glm::mat4& getTransfo()
 	{
 		return m_matrices[2];
 	}
@@ -82,6 +88,12 @@ public:
 		m_matrices[2] = glm::scale(m_matrices[2], glm::vec3(s,s,s));
 	}
 
+	void apply (const glm::mat4& m)
+	{
+		m_matrices[2] = m * m_matrices[2];
+
+	}
+
 };
 
 
diff --git a/src/Utils/drawer.cpp b/src/Utils/drawer.cpp
index cdd2be8d6b011cb54b2409192e22499e4e53c01b..c44f65434074933b5534b30e824f192c8509496b 100644
--- a/src/Utils/drawer.cpp
+++ b/src/Utils/drawer.cpp
@@ -103,7 +103,7 @@ void Drawer::color3f(float r, float g, float b)
 	color(Geom::Vec3f(r,g,b));
 }
 
-void Drawer::vertex(const Geom::Vec3f& v)
+unsigned int Drawer::vertex(const Geom::Vec3f& v)
 {
 	if (m_dataPos.size() == m_dataCol.size())
 	{
@@ -112,13 +112,13 @@ void Drawer::vertex(const Geom::Vec3f& v)
 		else
 			m_dataCol.push_back( m_dataCol.back());
 	}
-
 	m_dataPos.push_back(v);
+	return  m_dataPos.size()-1;
 }
 
-void Drawer::vertex3f(float r, float g, float b)
+unsigned int Drawer::vertex3f(float r, float g, float b)
 {
-	vertex(Geom::Vec3f(r,g,b));
+	return vertex(Geom::Vec3f(r,g,b));
 }
 
 void Drawer::newList(GLenum comp)
@@ -152,6 +152,20 @@ void Drawer::endList()
 		callList();
 }
 
+
+void Drawer::updatePositions(unsigned int first, unsigned int nb, const Geom::Vec3f* P)
+{
+	m_vboPos->bind();
+	glBufferSubData(GL_ARRAY_BUFFER, first * sizeof(Geom::Vec3f), nb * sizeof(Geom::Vec3f), P);
+}
+
+void Drawer::updatePositions(unsigned int first, unsigned int nb, const float* P)
+{
+	m_vboPos->bind();
+	glBufferSubData(GL_ARRAY_BUFFER, first * 3 * sizeof(float), nb * 3 * sizeof(float), P);
+}
+
+
 void Drawer::callList()
 {
 	if (m_begins.empty())