diff --git a/src/graphics/buffers.c b/src/graphics/buffers.c
index d74f9ea..af368e7 100644
--- a/src/graphics/buffers.c
+++ b/src/graphics/buffers.c
@@ -230,9 +230,9 @@ static bool grids_intersections (long x, long y, long z,
 
                 vertex_index += 3;
 
-                *(colors_origin  + colors_index + 0) = 1;// 3 * vx / 2;
-                *(colors_origin  + colors_index + 1) = 1;// 3 * vy / 2;
-                *(colors_origin  + colors_index + 2) = 1;// 3 * vz / 2;
+                *(colors_origin  + colors_index + 0) = 0.64f;// 3 * vx / 2;
+                *(colors_origin  + colors_index + 1) = 0.64f;// 3 * vy / 2;
+                *(colors_origin  + colors_index + 2) = 0.64f;// 3 * vz / 2;
 
                 colors_index += 3;
             };
@@ -444,13 +444,6 @@ static bool draw_line (GLuint *lines_origin, int a, int b)
     *(lines_origin + lines_index) = b; lines_index ++;
 }
 
-static bool draw_a_central_star(GLuint *lines_origin, long s, int x, int y, int z)
-{
-    draw_line (lines_origin, s + x * 12 + 0, s + x * 12 + 1);
-    draw_line (lines_origin, s + x * 12 + 2, s + x * 12 + 3);
-    draw_line (lines_origin, s + x * 12 + 4, s + x * 12 + 5);
-}
-
 static bool draw_an_arrow_0(GLuint *lines_origin, long s, int weight, int site, int x, int y, int z)
 {
 
@@ -511,22 +504,39 @@ static bool draw_an_arrow_5(GLuint *lines_origin, long s, int weight, int site,
     draw_line (lines_origin, s + site + x * 12 + 3, s + site + x * 12 + 11);
 }
 
-static bool draw_some_arrows (GLuint *lines_origin, long s, GLuint *arrows, int arrows_nb)
+static bool draw_a_central_star(GLuint *lines_origin, long n)
 {
-    draw_a_central_star(lines_origin, s + 1, 0, 0, 0);
-    draw_a_central_star(lines_origin, s + 1, 1, 0, 0);
-    draw_a_central_star(lines_origin, s + 1, 2, 0, 0);
+    draw_line (lines_origin, n + 0, n + 1);
+    draw_line (lines_origin, n + 2, n + 3);
+    draw_line (lines_origin, n + 4, n + 5);
+}
+
+static bool draw_some_arrows (GLuint *lines_origin,
+                              long s, long x, long y, long z,
+                              GLuint *arrows, int arrows_nb)
+{
+    long stx = z * y, sty = z, stz = 1;
+    long a = 0, b = 0, c = 0;
+
+    a = 0, b = 0, c = 0; draw_a_central_star(lines_origin, s + 1 + 12 * (stx * a + sty * b + stz * c));
+    a = 0, b = 0, c = 1; draw_a_central_star(lines_origin, s + 1 + 12 * (stx * a + sty * b + stz * c));
+    a = 1, b = 1, c = 1; draw_a_central_star(lines_origin, s + 1 + 12 * (stx * a + sty * b + stz * c));
+    a = 2, b = 2, c = 2; draw_a_central_star(lines_origin, s + 1 + 12 * (stx * a + sty * b + stz * c));
+
+/*
+    draw_an_arrow_0(lines_origin, s, 1, 1, 0, 0, 0);
+    draw_an_arrow_1(lines_origin, s, 1, 1, 0, 0, 0);
+    draw_an_arrow_2(lines_origin, s, 1, 1, 0, 0, 0);
+    draw_an_arrow_3(lines_origin, s, 1, 1, 0, 0, 0);
+    draw_an_arrow_4(lines_origin, s, 1, 1, 0, 0, 0);
+    draw_an_arrow_5(lines_origin, s, 1, 1, 0, 0, 0);
+
 
     draw_an_arrow_0(lines_origin, s, 1, 1, 1, 0, 0);
-    draw_an_arrow_1(lines_origin, s, 1, 1, 1, 0, 0);
-    draw_an_arrow_2(lines_origin, s, 1, 1, 1, 0, 0);
-    draw_an_arrow_3(lines_origin, s, 1, 1, 1, 0, 0);
-    draw_an_arrow_4(lines_origin, s, 1, 1, 1, 0, 0);
-    draw_an_arrow_5(lines_origin, s, 1, 1, 1, 0, 0);
+    draw_an_arrow_1(lines_origin, s, 1, 1, 1, 1, 0);
 
-    draw_an_arrow_0(lines_origin, s, 1, 1, 0, 0, 0);
-    draw_an_arrow_1(lines_origin, s, 1, 1, 2, 0, 0);
 
+*/
 }
 
 
@@ -542,6 +552,7 @@ static bool draw_some_arrows (GLuint *lines_origin, long s, GLuint *arrows, int
 
 
 
+
 static void show_user_choices(long model_size_x,
                               long model_size_y,
                               long model_size_z,
@@ -618,17 +629,11 @@ bool compute_space_and_arrows(long model_size_x, long model_size_y, long model_s
 
     long s = step_z * model_size_z + step_y * model_size_y + step_x * model_size_x;
 
-    draw_some_arrows (lines_origin, s, arrows, model_arrows_nb);
+    draw_some_arrows (lines_origin, s, model_size_x, model_size_y, model_size_z, arrows, model_arrows_nb);
 
     return 0;
 }
 
-    // OLD ARROWS (DEPRECATED)
-    /* old_arrows     (model_arrows_nb, model_size_x, model_size_y, model_size_z, arrows, */
-    /*                 pref_style_lines_planes, pref_style_mix_colors, */
-    /*                 vertex_origin, colors_origin, lines_origin, plans_origin); */
-
-
 
 
 
diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index 54d50ed..0494706 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -567,14 +567,14 @@ static void get_model_data_and_user_preferences(){
 
 
     model_space_size_x = 3;    //   0 < model_space_size_x
-    model_space_size_y = 1;    //   0 < model_space_size_y
-    model_space_size_z = 1;    //   0 < model_space_size_z
+    model_space_size_y = 3;    //   0 < model_space_size_y
+    model_space_size_z = 3;    //   0 < model_space_size_z
 
     // XXX ONLY space drawed, no arrows
     model_arrows_nb = 8; //  assert : l'emplacement des flèches est contraint
                          //  par model_space_size_x, y, z et le nombre de sites
                          //  OLD ARROWS (DEPRECATED)
-    nombre_de_cases_contenant_des_fleches = 3;  //  à calculer   TODO
+    nombre_de_cases_contenant_des_fleches = 4;  //  à calculer   TODO
 
  //   pref_1D_shown_as_3D_xor_2D_space = 0;       // 0 = 3D   1 = 2D
  //   pref_1D_shown_as_3D_xor_2D_arrows = 0;      // 0 = 3D   1 = 2D