diff --git a/a.out b/a.out
index 8d7c1d1..84cebc7 100755
Binary files a/a.out and b/a.out differ
diff --git a/display.cmi b/display.cmi
index 4301f53..950a000 100644
Binary files a/display.cmi and b/display.cmi differ
diff --git a/display.cmx b/display.cmx
index c9a6f01..1c6d686 100644
Binary files a/display.cmx and b/display.cmx differ
diff --git a/display.ml b/display.ml
index 46317e0..1f209b6 100644
--- a/display.ml
+++ b/display.ml
@@ -25,21 +25,37 @@ let chunk_size = 6 ;;
 let chunk_size_f = float_of_int chunk_size ;;
 
 (* between 0 (empty) and 100 (full) *)
-let density = 50 ;;
+let density = 35 ;;
 
-let speed_multiplier = 0.15 ;;
+let speed_multiplier = 0.1 ;;
 
 (* money money money *)
 let coins = ref 0 ;;
 
 (* player has a cube hitbox with 2*this_value as length *)
-let collison_leniency = (float_of_int cube_size) /. 10. ;;
+let collison_leniency = (float_of_int cube_size) /. 6. ;;
 
 (* hitbox for coins *)
 let coin_magnet_dist = 1. ;;
 
 (* -------------------------------------------------------------------------------------------------------- *)
 
+(* m/sœ *)
+let gravity = 0.98 ;;
+
+(* should be bigger then collision_leniency *)
+let gravity_leniency = (float_of_int cube_size) /. 6. ;;
+
+let vx = ref 0.0 
+and vy = ref 0.0
+and vz = ref 0.0 ;;
+
+let ax = ref 0.0 
+and ay = ref 0.0
+and az = ref 0.0 ;;
+
+(* -------------------------------------------------------------------------------------------------------- *)
+
 (* avg number of chunk generation required before encountering a structure of type 1 *)
 let structure_1_frequency = 2500 ;;
 
@@ -1042,6 +1058,17 @@ let is_collision_cube_bis (cam_coords : pt_3d) (cuube : coloredCube) =
     cuube.cube.(6).y +. collison_leniency >= (-. cam_coords.y) &&
     cuube.cube.(6).z +. collison_leniency >= cam_coords.z ;;
 
+let is_collision_cube_G (cam_coords : pt_3d) (cuube : coloredCube) = 
+  if is_string_integer cuube.flag then
+    false
+  else
+    cuube.cube.(0).x -. gravity_leniency <= (-. cam_coords.x) &&
+    cuube.cube.(0).y -. gravity_leniency <= (-. cam_coords.y) &&
+    cuube.cube.(0).z -. gravity_leniency <= cam_coords.z &&
+    cuube.cube.(6).x +. gravity_leniency >= (-. cam_coords.x) &&
+    cuube.cube.(6).y +. gravity_leniency >= (-. cam_coords.y) &&
+    cuube.cube.(6).z +. gravity_leniency >= cam_coords.z ;;
+
 let is_collision (cam_coords : pt_3d) (cubes : pt_3d array array) = 
   let res = ref false in
   let n = !n_walls in
@@ -1127,6 +1154,51 @@ let is_collision_hash_2 (cam_coords : pt_3d) (rcubes : (coloredCube dynamic) opt
     !res
   end ;;
 
+let is_collision_hash_G (cam_coords : pt_3d) (rcubes : (coloredCube dynamic) option) = match rcubes with
+  | None -> false
+  | Some cubes -> begin
+    let res = ref false in
+    let n = cubes.len in
+    
+    let distances = Array.make n 0. in
+    
+    for i = 0 to n-1 do
+      distances.(i) <- cube_dist cubes.tab.(i).cube;
+    done ;
+
+    let to_be_removed = ref [] in
+    let rem_len = ref 0 in
+
+    for i = 0 to n-1 do
+      if is_string_integer cubes.tab.(i).flag then begin (* coin *)
+        if is_collision_coin cam_coords cubes.tab.(i).cube then begin
+          let valc = str_to_int cubes.tab.(i).flag in
+          coins := !coins + valc;
+          to_be_removed := (i - !rem_len)::(!to_be_removed);
+          incr rem_len;
+          (*Printf.printf "%d" valc;
+          Stdlib.print_endline " "*)
+        end
+      end
+      else if (String.length cubes.tab.(i).flag) = 1 then begin (* ore *)
+        if is_collision_coin cam_coords cubes.tab.(i).cube then begin
+          add_ore_to_inventory cubes.tab.(i).flag;
+          to_be_removed := (i - !rem_len)::(!to_be_removed);
+          incr rem_len;
+          (*Printf.printf "%d" valc;
+          Stdlib.print_endline " "*)
+        end
+      end
+      else if not !res && distances.(i) < chunk_size_f then
+        (*res := is_collision_cube cam_coords cubes.tab.(i).cube*)
+        res := is_collision_cube_G cam_coords cubes.tab.(i)
+    done;
+
+    indent_list cubes !to_be_removed;
+
+    !res
+  end ;;
+
 let convert_laby laby =
   let width = Array.length laby
   and height = Array.length laby.(0)
@@ -1215,77 +1287,64 @@ let cheesify (laby : tile array array array) =
     done
   done;;
 
+let is_collision_global_2 hash cx cy cz =
+  (* O(n³) goes brrr *)
+  let boo = ref false in
+  for i = -1 to 1 do
+    for j = -1 to 1 do
+      for k = -1 to 1 do
+        boo := !boo || is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx+i,cy+j,cz+k))
+      done
+    done
+  done;
+  !boo ;;
+
+let is_collision_global_G hash cx cy cz =
+  let boo = ref false in
+  for i = -1 to 1 do
+    for j = -1 to 1 do
+      for k = -1 to 1 do
+        boo := !boo || is_collision_hash_G camera_xyz (Hashtbl.find_opt hash (cx+i,cy+j,cz+k))
+      done
+    done
+  done;
+  !boo ;;
+
 let rec move_cam_hash_2 hash cx cy cz b c =(* Printf.printf "[%b]" b; Stdlib.print_endline " " ; *)match c with
   | 'z' -> 
     camera_xyz.z <- camera_xyz.z +. speed_multiplier *. Float.cos ((float_of_int !camera_angle_y) *. 3.1415926535 /. 180.);
     camera_xyz.x <- camera_xyz.x +. speed_multiplier *. Float.sin ((float_of_int !camera_angle_y) *. 3.1415926535 /. 180.);
     if b && (
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx+1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx-1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy+1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy-1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz+1))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz-1)))
+      is_collision_global_2 hash cx cy cz
     ) then move_cam_hash_2 hash cx cy cz false 's'
   | 'q' -> 
     camera_xyz.z <- camera_xyz.z +. speed_multiplier *. Float.cos (((float_of_int !camera_angle_y) +. 90.) *. 3.1415926535 /. 180.);
     camera_xyz.x <- camera_xyz.x +. speed_multiplier *. Float.sin (((float_of_int !camera_angle_y) +. 90.) *. 3.1415926535 /. 180.);
     if b && (
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx+1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx-1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy+1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy-1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz+1))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz-1)))
+      is_collision_global_2 hash cx cy cz
     ) then move_cam_hash_2 hash cx cy cz false 'd'
   | 's' -> 
     camera_xyz.z <- camera_xyz.z -. speed_multiplier *. Float.cos ((float_of_int !camera_angle_y) *. 3.1415926535 /. 180.);
     camera_xyz.x <- camera_xyz.x -. speed_multiplier *. Float.sin ((float_of_int !camera_angle_y) *. 3.1415926535 /. 180.);
     if b && (
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx+1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx-1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy+1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy-1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz+1))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz-1)))
+      is_collision_global_2 hash cx cy cz
     ) then move_cam_hash_2 hash cx cy cz false 'z'
   | 'd' -> 
     camera_xyz.z <- camera_xyz.z +. speed_multiplier *. Float.cos (((float_of_int !camera_angle_y) -. 90.) *. 3.1415926535 /. 180.);
     camera_xyz.x <- camera_xyz.x +. speed_multiplier *. Float.sin (((float_of_int !camera_angle_y) -. 90.) *. 3.1415926535 /. 180.);
     if b && (
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx+1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx-1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy+1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy-1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz+1))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz-1)))
+      is_collision_global_2 hash cx cy cz
     ) then move_cam_hash_2 hash cx cy cz false 'q'
   | 'p' -> 
     camera_xyz.y <- camera_xyz.y -. speed_multiplier ;
     if b && (
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx+1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx-1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy+1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy-1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz+1))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz-1)))
-    ) then move_cam_hash_2 hash cx cy cz false 'm'
+      is_collision_global_2 hash cx cy cz
+    ) then begin Stdlib.print_endline "Nope (p)" ; move_cam_hash_2 hash cx cy cz false 'm' end
   | 'm' -> 
     camera_xyz.y <- camera_xyz.y +. speed_multiplier ;
     if b && (
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx+1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx-1,cy,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy+1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy-1,cz))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz+1))) ||
-      (is_collision_hash_2 camera_xyz (Hashtbl.find_opt hash (cx,cy,cz-1)))
-    ) then move_cam_hash_2 hash cx cy cz false 'p'
+      is_collision_global_2 hash cx cy cz
+    ) then begin Stdlib.print_endline "Nope (m)" ; move_cam_hash_2 hash cx cy cz false 'p' end
   | 'a' -> camera_angle_y := !camera_angle_y + 1
   | 'e' -> camera_angle_y := !camera_angle_y - 1
   | _ -> () ;;
@@ -1617,6 +1676,34 @@ let draw_inventories () =
     draw_integer_alignedleft 40 (__height__ - (240 + 50 * (Array.length playerOreInventory -1 -i))) playerOreInventory.(i) 20
   done ;;
 
+exception CannotPass ;;
+let move_auto_y hash redraw =
+  try
+    let (cx, cy, cz) = coords_to_chunk_f (-. camera_xyz.x) (-. camera_xyz.y) camera_xyz.z in
+    for i = 1 to 15 do
+      camera_xyz.y <- camera_xyz.y +. !vy /. 15.;
+      let new_cy = ctcf_one (-. camera_xyz.y) in
+      if is_collision_global_G hash cx new_cy cz then begin
+        if i <> 1 then
+          redraw := true;
+        camera_xyz.y <- camera_xyz.y -. !vy /. 15. ;
+        raise CannotPass
+      end
+      else
+        ()
+    done ;
+    redraw := true;
+    ()
+  with
+    | CannotPass -> vy := 0.; () ;;
+
+
+let update_gravity dt hash redraw =
+  vy := !vy +. gravity *. dt ;
+  Printf.printf "{%f, %f, %f}" !vx !vy !vz;
+  Stdlib.print_endline " ";
+  move_auto_y hash redraw ;;
+
 let play_dos laby =
   try
     Stdlib.print_endline "Building terrain...";
@@ -1650,6 +1737,8 @@ let play_dos laby =
     camera_xyz.z <- 2. ;
 
     while true do
+      let time_s = Unix.gettimeofday() in
+
       if !redraw then begin (* update the display *)
         auto_synchronize false;
         open_graph openstring;
@@ -1670,11 +1759,18 @@ let play_dos laby =
 
       let usr_input = get1char_plus () in 
       if usr_input <> '@' then begin
-        for i = 0 to 9 do
+        Stdlib.print_endline "EEEEE";
+        for i = 0 to 15 do
           move_cam_hash_2 hash !ch_x !ch_y !ch_z true usr_input
         done;
         redraw := true
-      end
+      end;
+      Unix.sleepf 0.001;
+
+      let time_e = Unix.gettimeofday() in
+      (*Printf.printf "[%f]" (time_e -. time_s);
+      Stdlib.print_endline " ";*)
+      update_gravity (time_e -. time_s) hash redraw
     done ;
     ()
   with
diff --git a/display.o b/display.o
index 5bc0401..b47a3cb 100644
Binary files a/display.o and b/display.o differ