diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index 40ac033..7364b4e 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -151,6 +151,8 @@ void graphics_write_vertex (GLfloat x, GLfloat y, GLfloat z)
     buffer_vertex_origin[buffer_vertex_size + 1] = y;
     buffer_vertex_origin[buffer_vertex_size + 2] = z;
 
+    printf("buffer_vertex_size = %d  (%6.3f,%6.3f,%6.3f)\n", buffer_vertex_size, x, y, z);
+
     buffer_vertex_size += 3;
 }
 
@@ -676,16 +678,16 @@ 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 = 30;
-    int space_X = 1 + rand() % arbitrary,
-        space_Y = 1 + rand() % arbitrary,
-        space_Z = 1 + rand() % arbitrary;
+    int space_X = 3,//1 + rand() % arbitrary,
+        space_Y = 3,//1 + rand() % arbitrary,
+        space_Z = 3;//1 + rand() % arbitrary;
     int density_max = space_X * space_Y * space_Z;
     int max = fmax(space_X, space_Y); max = fmax(max, space_Z);
 
     int show_space_design = 0, print_arrows_data = 0;
 
     int load = 0, site = 0, x = 0, y = 0, z = 0;
-    int specif_arrows_nb = rand() % density_max / 3;
+    int specif_arrows_nb = 0;//rand() % density_max / 3;
     int arrows_nb = 0;
 
     while (arrows_nb < specif_arrows_nb){
@@ -714,9 +716,16 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
     offset_vertex += write_space_ridges_vertex (offset_vertex, offset_colors, offset_lines, space_X, space_Y, space_Z);
     offset_colors = offset_vertex;
 
+    printf("offset_vertex after writing_space_ridges_vertex : %d (x 3 = %d)\n\n", offset_vertex, offset_vertex * 3);
+
     offset_vertex += write_grids_on_space_faces_vertex (offset_vertex, offset_colors, offset_lines, space_X, space_Y, space_Z, show_space_design);
     offset_colors = offset_vertex;
 
+    printf("offset_vertex after writing_space_faces_vertex = %2d   - 8 = %d (x 3 = %d)\n", offset_vertex, offset_vertex - 8, (offset_vertex - 8) * 3);
+    printf("(space_X - 1) * 4 + (space_Y - 1) * 4 + (space_Z - 1) * 4 = %2d (x 3 = %d)\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);
+
+
     /*   A R R O W S   */
 
     for (int i = 0; i < arrows_nb; i++) {
@@ -732,6 +741,8 @@ void  __attribute__((optimize("no-unroll-loops"))) main_test_graphics (void)
         offset_colors = offset_vertex;
     }
 
+    printf("offset_vertex after writing_arrows_vertex : %d (x 3 = %d)   (arrows_nb = %d)\n", offset_vertex, offset_vertex * 3, arrows_nb);
+
 
     /*---------------------------------------------------------------*/
 
diff --git a/src/graphics/grid.c b/src/graphics/grid.c
index 696e14c..2dc8ae1 100644
--- a/src/graphics/grid.c
+++ b/src/graphics/grid.c
@@ -62,10 +62,10 @@ int write_space_ridges_lines (long offset_vertex, long offset_colors, long offse
     graphics_write_line ( 1,  5);    graphics_write_line ( 3,  5);
     graphics_write_line ( 2,  6);    graphics_write_line ( 3,  6);
 
-    return 8;
+    return 12;
 }
 
-long write_grids_on_space_faces_vertex (long offset_vertex, long offset_colors, long offset_lines, long x, long y, long z, int style)
+long write_grids_on_space_faces_vertex (long offset_vertex, long offset_colors, long offset_lines, long x, long y, long z, int design)
 {
     float i, max = fmax(x, y); max = fmax(max, z);
 
@@ -118,46 +118,48 @@ long write_grids_on_space_faces_vertex (long offset_vertex, long offset_colors,
 }
 
 
-long write_grids_on_space_faces_lines (long offset_vertex, long offset_colors, long offset_lines, long x, long y, long z, int style)
+long write_grids_on_space_faces_lines (long offset_vertex, long offset_colors, long offset_lines, long x, long y, long z, int design)
 {
     float i, max = fmax(x, y); max = fmax(max, z);
 
+    design = 1;
+
     for (i = 0; i < x - 1; i ++) {
 
-        if (style)
+        if (design)
             graphics_write_line (offset_vertex + i * 4 + 0,  offset_vertex + i * 4 + 1);
         graphics_write_line (offset_vertex + i * 4 + 1,  offset_vertex + i * 4 + 2);
         graphics_write_line (offset_vertex + i * 4 + 2,  offset_vertex + i * 4 + 3);
-        if (style)
+        if (design)
             graphics_write_line (offset_vertex + i * 4 + 3,  offset_vertex + i * 4 + 0);
     }
 
-    /* if (style) offset_lines += (x - 1) * 2; else offset_lines += (x - 1) * 4; */
+    /* if (design) offset_lines += (x - 1) * 2; else offset_lines += (x - 1) * 4; */
 
     for (i = 0; i < y - 1; i ++) {
 
-        if (style)
+        if (design)
             graphics_write_line (offset_vertex + i * 4 + 0,  offset_vertex + i * 4 + 1);
-        if (style)
+        if (design)
             graphics_write_line (offset_vertex + i * 4 + 1,  offset_vertex + i * 4 + 2);
         graphics_write_line (offset_vertex + i * 4 + 2,  offset_vertex + i * 4 + 3);
         graphics_write_line (offset_vertex + i * 4 + 3,  offset_vertex + i * 4 + 0);
     }
 
-    /* if (style) offset_lines += (y - 1) * 2; else offset_lines += (y - 1) * 4; */
+    /* if (design) offset_lines += (y - 1) * 2; else offset_lines += (y - 1) * 4; */
 
     for (i = 0; i < z - 1; i ++) {
 
         graphics_write_line (offset_vertex + i * 4 + 0,  offset_vertex + i * 4 + 1);
-        if (style)
+        if (design)
             graphics_write_line (offset_vertex + i * 4 + 1,  offset_vertex + i * 4 + 2);
-        if (style)
+        if (design)
             graphics_write_line (offset_vertex + i * 4 + 2,  offset_vertex + i * 4 + 3);
         graphics_write_line (offset_vertex + i * 4 + 3,  offset_vertex + i * 4 + 0);
     }
 
     return (x + y + z - 3) * 4;
-    /* if (style)  offset_lines += 2 * (space_X + space_Y + space_Z - 3); */
+    /* if (design)  offset_lines += 2 * (space_X + space_Y + space_Z - 3); */
     /* else        offset_lines += 4 * (space_X + space_Y + space_Z - 3); */