diff --git a/apps/demos/scenery/scenes/ingame.c b/apps/demos/scenery/scenes/ingame.c
index 29481d9..26f58ee 100644
--- a/apps/demos/scenery/scenes/ingame.c
+++ b/apps/demos/scenery/scenes/ingame.c
@@ -59,9 +59,9 @@ static float heightmap[TERRAIN_DISTANCE][TERRAIN_DISTANCE];
 #define VEHICLE_HEIGHT 1.3f
 /* spring constant */
 #define VEHICLE_SPRING_K 20000.0f
-#define VEHICLE_SPRING_GK 60000.0f
+#define VEHICLE_SPRING_GK 80000.0f
 /* damping constant */
-#define VEHICLE_SPRING_C 500.0f
+#define VEHICLE_SPRING_C 800.0f
 #define VEHICLE_SPRING_GC 100.0f
 #define VEHICLE_FRICTION_S 1000.0f
 #define VEHICLE_FRICTION_K 100.0f
@@ -147,8 +147,8 @@ static void process_vehicle(SceneIngame *scn) {
             /* wheel processing */
             if (i == 0 || i == 3 || i == 4 || i == 7) {
                 if (scn->camera_mode == 2 && input_action_pressed("player_forward")) {
-                    Vec3 const dir = i == 0 ? vec3_sub(vbp[0], vbp[1]) : vec3_sub(vbp[3], vbp[2]);
-                    Facc[i] = vec3_add(Facc[i], vec3_scale(vec3_norm(dir), 15000));
+                    Vec3 dir = i == 0 ? vec3_sub(vbp[1], vbp[0]) : vec3_sub(vbp[2], vbp[3]);
+                    Facc[i] = vec3_add(Facc[i], vec3_scale(vec3_norm(dir), 6500));
                 }
             }
 
@@ -157,36 +157,46 @@ static void process_vehicle(SceneIngame *scn) {
             float const xn = (h - p.y) * n.y;
             float const vn = vec3_dot(v, n);
             Vec3 const Fn = vec3_scale(n, -VEHICLE_SPRING_GK * xn - VEHICLE_SPRING_GC * vn);
-            draw_line_3d(vbp[i], vec3_sub(vbp[i], Fn), 1, (Color){255,255,0,255});
             Facc[i] = vec3_sub(Facc[i], Fn);
 
             /* friction force, perpendicular to normal force */
-            Vec3 const vo = vec3_sub(v, vec3_scale(n, vn));
+            /* TODO: is it right? aren't vn+vol should be = |v| */
+            Vec3 const von = vec3_norm(vec3_cross(n, vec3_cross(v, n)));
+            draw_line_3d(vbp[i], vec3_add(vbp[i], von), 1, (Color){255,255,0,255});
+            Vec3 const vo = vec3_scale(vec3_scale(von, vec3_length(v) - vn), -1);
             float const vol = vec3_length(vo);
-            Vec3 Fo = vec3_sub(Facc[i], vec3_scale(n, vec3_dot(Facc[i], n)));
+            Vec3 const Fon = vec3_norm(vec3_cross(n, vec3_cross(Facc[i], n)));
+            Vec3 Fo = vec3_scale(vec3_scale(Fon, vec3_length(Facc[i]) - vec3_dot(Facc[i], n)), -1);
+            draw_line_3d(vbp[i], vec3_add(vbp[i], Fon), 1, (Color){255,255,0,255});
             /* portion of total force along the surface */
             float const Fol = vec3_length(Fo);
             float const fkxn = VEHICLE_FRICTION_K * xn;
             /* at rest, might want to start moving */
             if (fabsf(0.0f - vol) <= 0.0001f) {
                 /* cannot overcome static friction, force along the surface is zeroed */
-                if (Fol <= VEHICLE_FRICTION_S * xn) Fo = (Vec3){0};
+                if (Fol <= VEHICLE_FRICTION_S * xn) {log_info("test 0"); Fo = vec3_scale(Fo, -1);}
                 /* resist the force by friction, while starting to move */
-                else Fo = vec3_sub(Fo, vec3_scale(vec3_norm(Fo), fkxn));
+                else {log_info("test 1"); Fo = vec3_sub(Fo, vec3_scale(von, fkxn));}
             /* not at rest, stop accelerating along the surface */
-            } else if (vol + (Fol / VEHICLE_MASS) * ctx.frame_duration <= fkxn * ctx.frame_duration) {
-                vbv[i] = vec3_sub(vbv[i], vo);
+            } else if (vol + (Fol / VEHICLE_MASS) * ctx.frame_duration <= fkxn * ctx.frame_duration * 2) {
+                /* ugh ... */
+                vbv[i] = vec3_add(vbv[i], vo);
+                log_info("test 2");
             /* just apply friction */
             } else {
-                Fo = vec3_add(Fo, vec3_scale(vec3_norm(vo), -fkxn * 1000));
+                Fo = vec3_scale(von, -fkxn * 400);
             }
             Facc[i] = vec3_add(Facc[i], Fo);
+            // Facc[i] = vec3_sub(Fo, Fn);
+            // Facc[i] = vec3_sub(Fo, Fn);
+            Vec3 vd = vec3_scale(vec3_scale(Facc[i], (1.0f / VEHICLE_MASS)), ctx.frame_duration);
+            vbv[i] = vec3_add(vbv[i], vd);
+            vbp[i] = vec3_add(vbp[i], vec3_scale(vbv[i], ctx.frame_duration));
+        } else {
+            Vec3 vd = vec3_scale(vec3_scale(Facc[i], (1.0f / VEHICLE_MASS)), ctx.frame_duration);
+            vbv[i] = vec3_add(vbv[i], vd);
+            vbp[i] = vec3_add(vbp[i], vec3_scale(vbv[i], ctx.frame_duration));
         }
-
-        /* in air */
-        Vec3 vd = vec3_scale(vec3_scale(Facc[i], (1.0f / VEHICLE_MASS)), ctx.frame_duration);
-        vbv[i] = vec3_add(vbv[i], vd);
-        vbp[i] = vec3_add(vbp[i], vec3_scale(vbv[i], ctx.frame_duration));
     }
 }
 
@@ -208,7 +218,7 @@ static void process_vehicle_mode(State *state) {
         yaws * pitchc,
     }));
 
-    Vec3 const orbit = vec3_sub(top_center, vec3_scale(looking_direction, 10));
+    Vec3 const orbit = vec3_sub(top_center, vec3_scale(looking_direction, 7.5));
 
     draw_camera(orbit, looking_direction, (Vec3){0,1,0}, (float)M_PI_2 * 0.8f, 1, TERRAIN_RADIUS * sqrtf(3));
 
@@ -345,7 +355,7 @@ static void generate_terrain(SceneIngame *scn) {
             float height = stb_perlin_noise3((float)x * TERRAIN_FREQUENCY, (float)y * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 3 - 1;
             height += stb_perlin_noise3((float)x * TERRAIN_FREQUENCY / 10, (float)y * TERRAIN_FREQUENCY / 10, 0, 0, 0, 0) * 20 - 1;
 
-            heightmap[lx][ly] = height * 0.3f;
+            heightmap[lx][ly] = height;
         }
     }
 
@@ -481,11 +491,11 @@ static void ingame_tick(State *state) {
     if (input_action_just_pressed("mouse_capture_toggle"))
         scn->mouse_captured = !scn->mouse_captured;
 
-    process_vehicle(scn);
-
     ctx.mouse_capture = scn->mouse_captured;
 
     generate_terrain(scn);
+    process_vehicle(scn);
+
     draw_terrain(scn);
     draw_vehicle(scn);