diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index 3a2f3c6..49b8db8 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -117,7 +117,7 @@ static void graphics_debug_callback(GLenum source, GLenum type, GLuint id,
 /* -------------------------------------------------------------------------- */
 
 /*
- *  Writes values to describe a vertex at (x,y,z) into the vertex buffer
+ *  Writes values to describe a vertex at (x,y,z) intoq the vertex buffer
  *
  *  @param coords GLfloat(x,y,z)
  *
@@ -681,9 +681,9 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
     void srand(unsigned int seed);  //    printf ("Valeur max : %d\n", RAND_MAX);   min + rand() % (max+1 - min);
 
     int arbitrary = 3;
-    int space_X = 3,// + rand() % arbitrary,
+    int space_X = 2,// + rand() % arbitrary,
         space_Y = 2,// + rand() % arbitrary,
-        space_Z = 1;// + rand() % arbitrary;
+        space_Z = 2;// + rand() % arbitrary;
     int density_max = space_X * space_Y * space_Z;
     int max = fmax(space_X, space_Y); max = fmax(max, space_Z);
 
@@ -740,8 +740,8 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
     buffer_vertex_size += write_grids_on_space_faces_vertex (space_X, space_Y, space_Z);
     buffer_colors_size = buffer_vertex_size;
 
-    if (1) printf("buffer_vertex_size after writing_space_faces_vertex = %4d - 8 = %3d (x 3 = %4d)\n", buffer_vertex_size, buffer_vertex_size - 8, (buffer_vertex_size - 8) * 3);
-    if (1) printf("(space_X - 1) * 4 + (space_Y - 1) * 4 + (space_Z - 1) * 4 = %3d (x 3 = %4d)\n\n",\
+    if (1) printf("buffer_vertex_size after writing_space_faces_vertex = %4d - 8 = %3d (x 3 = %4d)\n\n", buffer_vertex_size, buffer_vertex_size - 8, (buffer_vertex_size - 8) * 3);
+    if (0) printf("(space_X - 1) * 4 + (space_Y - 1) * 4 + (space_Z - 1) * 4 = %3d (x 3 = %4d)\n\n",\
            (space_X - 1) * 4 + (space_Y - 1) * 4 + (space_Z - 1) * 4, ((space_X - 1) * 4 + (space_Y - 1) * 4 + (space_Z - 1)  * 4) * 3);
 
 
@@ -760,7 +760,7 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
         buffer_colors_size = buffer_vertex_size;
     }
 
-    if (1) printf("buffer_vertex_size after writing_arrows_vertex : %d (x 3 = %d)   (arrows_nb = %d)\n", buffer_vertex_size, buffer_vertex_size * 3, arrows_nb);
+    if (1) printf("buffer_vertex_size after writing_arrows_vertex : %d    TODO  (arrows_nb = %d)\n\n", buffer_vertex_size, arrows_nb);
 
 
     /*---------------------------------------------------------------*/
@@ -771,9 +771,13 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
 
     /*   S P A C E    */
 
-    buffer_vertex_size += write_space_ridges_lines ();
+   buffer_vertex_size += write_space_ridges_lines ();
+    if (1) printf("buffer_vertex_size after writing_space_ridges_lines : %d (x 3 = %d)\n\n", buffer_vertex_size, buffer_vertex_size * 3);
 
-    buffer_vertex_size += write_grids_on_space_faces_lines (buffer_vertex_size, space_X, space_Y, space_Z);
+    int offset_test = 14; // 10
+                          //
+    buffer_vertex_size += write_grids_on_space_faces_lines (offset_test, space_X, space_Y, space_Z);
+    if (1) printf("buffer_vertex_size after writing_space_faces_lines : %d (x 3 = %d)\n\n", buffer_vertex_size, buffer_vertex_size * 3);
 
     /*  A R R O W S  */