diff --git a/cylinder.cpp b/cylinder.cpp
index 370b145..988b11a 100644
--- a/cylinder.cpp
+++ b/cylinder.cpp
@@ -25,7 +25,6 @@ Cylinder::Cylinder(float ep, float r, unsigned nb_fac, Color c)
 	 face_size(nb_fac * 3),
 	 side_size((nb_fac+1) * 2)
 {
-	vector<GLfloat> verts((2*face_size + side_size) * 3 * 2);
 	build_faces(verts);
 	build_side(verts);
 	vbo.create();
@@ -36,6 +35,12 @@ Cylinder::Cylinder(float ep, float r, unsigned nb_fac, Color c)
 	vbo.bind();
 	vbo.allocate(verts.data(), verts.size() * sizeof (GLfloat));
 	vbo.release();
+	qDebug() << verts;
+}
+
+
+Cylinder::~Cylinder() {
+	vbo.destroy();
 }
 
 
@@ -80,15 +85,14 @@ void Cylinder::build_side(vector<GLfloat> &verts)
 
 void Cylinder::draw(QOpenGLFunctions &f, int pos, int col)
 {
-	vbo.bind();
-	f.glEnableVertexAttribArray(pos);
+	// vbo.bind();
+	f.glBindBuffer(GL_ARRAY_BUFFER, vbo.bufferId());
 	f.glVertexAttribPointer(pos, 3, GL_FLOAT, GL_FALSE,
-							3 * sizeof (GLfloat),
-							nullptr);
-	f.glEnableVertexAttribArray(col);
+							6 * sizeof (GLfloat), verts.data());
 	f.glVertexAttribPointer(col, 3, GL_FLOAT, GL_FALSE,
-							3 * sizeof (GLfloat),
-							(void *) (3 * sizeof (GLfloat)));
+							6 * sizeof (GLfloat), verts.data() + 3);
+	f.glEnableVertexAttribArray(pos);
+	f.glEnableVertexAttribArray(col);
 	f.glDrawArrays(GL_TRIANGLES, 0, face_size);
 	f.glDrawArrays(GL_TRIANGLES, face_size, face_size);
 	f.glDrawArrays(GL_QUAD_STRIP,
@@ -96,5 +100,5 @@ void Cylinder::draw(QOpenGLFunctions &f, int pos, int col)
 				   side_size);
 	f.glDisableVertexAttribArray(pos);
 	f.glDisableVertexAttribArray(col);
-	vbo.release();
+	// vbo.release();
 }
diff --git a/cylinder.h b/cylinder.h
index 643b109..97f5119 100644
--- a/cylinder.h
+++ b/cylinder.h
@@ -30,9 +30,11 @@ struct Cylinder
 	size_t face_size;
 	size_t side_size;
 
+	std::vector<GLfloat> verts;
 	QOpenGLBuffer vbo;
 
 	Cylinder(float ep, float r, unsigned nb_fac, Color c);
+	~Cylinder();
 
 	void build_face(float z, std::vector<GLfloat> &verts);
 	void build_faces(std::vector<GLfloat> &verts);
diff --git a/glarea.cpp b/glarea.cpp
index 2356791..e7e6431 100644
--- a/glarea.cpp
+++ b/glarea.cpp
@@ -76,7 +76,7 @@ void GLArea::resizeGL(int w, int h)
 void GLArea::paintGL()
 {
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-    program->bind(); // active le shader program
+    program->bind();
 
     QMatrix4x4 matrix;
     GLfloat hr = focal_length;
diff --git a/scene.cpp b/scene.cpp
index 87a75c4..adb3ad0 100644
--- a/scene.cpp
+++ b/scene.cpp
@@ -6,86 +6,14 @@ using namespace std;
 
 
 Scene::Scene()
-	:volant(.2, .55, 8, Color(.522, .816, 1)),
-	 axe_volant(.6, .06, 6, Color(.522*.5, .816*.5, 1.5)),
-	 manivelle(.2, .115, 8, Color(.078, .718, .078)),
-	 axe_manivelle(.35, .06, 6, Color(.078*.5, .718*.5, .078*.5)),
-	 bague_bielle(.2, .14, 8, Color(.078, .718, .078)),
-	 bague_piston(.2, .115, 8, Color(.69, .11, .69)),
-	 axe_bielle_piston(.36, .06, 6, Color(.69*.5, .11*.5, .69*.5)),
-	 bielle(1.5, .05, 6, Color(.173, .824, .173)),
-	 piston(1.1, .065, 6, Color(.847, .318, .847)),
-	 cylindre(1.2, .15, 8, Color(.702, .424, .286)) {}
+	: cylindre(1, 1, 4, Color(.702, .424, .286)) {}
 
 
 void Scene::draw(QOpenGLFunctions &f, QOpenGLShaderProgram *prog, int mat_uni,
 				 float alpha, QMatrix4x4 &matrix, int pos, int col)
 {
-	float gh = .45;
-	float xh = gh*cos(alpha);
-	float yh = gh*sin(alpha);
-
-	QMatrix4x4 m, m2;
-
-	/* Volant */
-	m = matrix;
-		matrix.rotate(alpha*360/(2*M_PI), 0, 0, 1);
-		prog->setUniformValue(mat_uni, matrix);
-		volant.draw(f, pos, col);
-		m2 = matrix;
-			matrix.translate(0, 0, -axe_volant.ep/2 + .125);
-			prog->setUniformValue(mat_uni, matrix);
-			axe_volant.draw(f, pos, col);
-		matrix = m2;
-		matrix.translate(gh, 0, axe_manivelle.ep/2);
-		prog->setUniformValue(mat_uni, matrix);
-		axe_manivelle.draw(f, pos, col);
-	matrix = m;
-
-	/* Manivelle */
-	m = matrix;
-		matrix.translate(xh, yh, volant.ep/2+manivelle.ep/2);
-		prog->setUniformValue(mat_uni, matrix);
-		manivelle.draw(f, pos, col);
-	matrix = m;
-
-	float hj = bielle.ep;
-	float xj = xh - sqrtf(hj*hj - powf(gh*sin(alpha), 2));
-	float b = atanf(yh / (xj-xh < 0 ? xj-xh : -xj+xh));
-	m = matrix;
-		matrix.translate(xj, 0, volant.ep/2+manivelle.ep/2);
-		prog->setUniformValue(mat_uni, matrix);
-		bague_bielle.draw(f, pos, col);
-		/* Bielle */
-		m2 = matrix;
-			matrix.rotate(90, 0, 1, 0);
-			matrix.rotate(b*360/(2*M_PI), 1, 0, 0);
-			matrix.translate(0, 0, bielle.ep/2);
-			prog->setUniformValue(mat_uni, matrix);
-			bielle.draw(f, pos, col);
-		matrix = m2;
-		/* Piston */
-		m2 = matrix;
-			matrix.translate(0, 0, axe_bielle_piston.ep/2);
-			prog->setUniformValue(mat_uni, matrix);
-			axe_bielle_piston.draw(f, pos, col);
-			matrix.translate(0, 0, axe_bielle_piston.ep/2 - .15);
-			prog->setUniformValue(mat_uni, matrix);
-			bague_piston.draw(f, pos, col);
-			matrix.rotate(90, 0, 1, 0);
-			matrix.translate(0, 0, -piston.ep/2);
-			prog->setUniformValue(mat_uni, matrix);
-			piston.draw(f, pos, col);
-		matrix = m2;
-	matrix = m;
-
-	/* Cylindre */
-	m = matrix;
-		matrix.translate(-gh-bielle.ep - piston.ep + .3, 0, volant.ep/2
-					 + bague_bielle.ep
-					 + bague_piston.ep/2);
-		matrix.rotate(90, 0, 1, 0);
-		prog->setUniformValue(mat_uni, matrix);
-		cylindre.draw(f, pos, col);
-	matrix = m;
+	// matrix.rotate(70, 1, 0, 0);
+	// matrix.rotate(15, 0, 0, 1);
+	prog->setUniformValue(mat_uni, matrix);
+	cylindre.draw(f, pos, col);
 }
diff --git a/scene.h b/scene.h
index 6aa5687..439312e 100644
--- a/scene.h
+++ b/scene.h
@@ -15,15 +15,6 @@ public:
 			  float alpha, QMatrix4x4 &matrix, int vertices, int colors);
 
 private:
-	Cylinder volant;
-	Cylinder axe_volant;
-	Cylinder manivelle;
-	Cylinder axe_manivelle;
-	Cylinder bague_bielle;
-	Cylinder bague_piston;
-	Cylinder axe_bielle_piston;
-	Cylinder bielle;
-	Cylinder piston;
 	Cylinder cylindre;
 };