diff --git a/includes/utils.h b/includes/utils.h
index 43f0afe..286d8d5 100644
--- a/includes/utils.h
+++ b/includes/utils.h
@@ -4,6 +4,6 @@
 #include <GL4D/gl4dummies.h>
 
 // Récupère un delta-temps
-double get_dt(void);
+double get_dt(double *, GLboolean);
 
 #endif
diff --git a/src/credits.c b/src/credits.c
index 7e44251..949ab31 100644
--- a/src/credits.c
+++ b/src/credits.c
@@ -60,13 +60,11 @@ static void draw(void) {
   glClearColor(0, 0, 0, 1);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-  static Uint32 t0 = -1;
-  GLfloat t, d;
-  if ((int)t0 == -1) {
-    t0 = SDL_GetTicks();
+  static double t0 = -1;
+  if (t0 == -1) {
+    t0 = gl4dGetElapsedTime();
   }
-  t = (GLfloat)(SDL_GetTicks() - t0) / 1000.f;
-  d = -1.1f + .25f * t;
+  GLfloat dt = .25f * (GLfloat)get_dt(&t0, GL_FALSE) - 1.1f;
 
   GLfloat ratio = (GLfloat)_dims[0] / (GLfloat)_dims[1];
   gl4duBindMatrix(matrix_proj);
@@ -76,7 +74,7 @@ static void draw(void) {
   gl4duBindMatrix(matrix_modview);
   gl4duLoadIdentityf();
 
-  gl4duTranslatef(0.f, d, -2.f);
+  gl4duTranslatef(0.f, dt, -2.f);
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, _texId);
   gl4duScalef(1, 0.3f, 1);
diff --git a/src/manif.c b/src/manif.c
index 3f5d8a3..1426020 100644
--- a/src/manif.c
+++ b/src/manif.c
@@ -40,6 +40,9 @@ static void init(void) {
 }
 
 static void draw(void) {
+  static double t0 = 0;
+  double dt = get_dt(&t0, GL_TRUE);
+
   glClearColor(0.2f, 0.2f, 0.8f, 1);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glUseProgram(_pId);
@@ -47,6 +50,7 @@ static void draw(void) {
   const GLfloat couleur_plan[] = {0.3f, 0.3f, 0.3f, 1},
                 couleur_heros[] = {1, 1, 0, 1};
   GLint couleur_loc = glGetUniformLocation(_pId, "couleur");
+  static double deplacement = 0;
 
   const GLfloat lumpos[] = {1, 2, 3, 1};
   GLint lum_loc = glGetUniformLocation(_pId, "lumpos");
@@ -78,6 +82,6 @@ static void draw(void) {
   gl4duSendMatrices();
   glUniform4fv(couleur_loc, 1, couleur_heros);
   gl4dgDraw(_herosId);
-
+  deplacement += 0.4 * M_PI * dt;
   glUseProgram(0);
 }
diff --git a/src/utils.c b/src/utils.c
index e9c181c..e9cae7b 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -1,9 +1,10 @@
 #include "../includes/utils.h"
 
-double get_dt(void) {
-  static double t0 = 0.0f;
-  double t = gl4dGetElapsedTime(), dt = (t - t0) / 1000.0;
-  t0 = t;
+double get_dt(double *t0, GLboolean override_t0) {
+  double t = gl4dGetElapsedTime(), dt = (t - *t0) / 1000.0;
+  if (override_t0) {
+    *t0 = t;
+  }
 
   return dt;
 }