diff --git a/.vscode/settings.json b/.vscode/settings.json
index 0471f99..ae64e74 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -4,6 +4,9 @@
         "stdio.h": "c",
         "math.h": "c",
         "sdl_image.h": "c",
-        "display.h": "c"
+        "display.h": "c",
+        "generation.h": "c",
+        "time.h": "c",
+        "limits": "c"
     }
 }
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 48343b4..921b2a7 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ all: bin/back
 test: bin/back
 	bin/back
 
-bin/back: obj/main.o obj/generation.o obj/display.o obj/move.o obj/base.o obj/hash.o
+bin/back: obj/main.o obj/generation.o obj/display.o obj/entities.o obj/move.o obj/base.o obj/hash.o
 	mkdir -p bin
 	$(CC) $(FLAGS) $^ $(LFLAGS) -o $@
 
@@ -18,6 +18,7 @@ obj/%.o: src/%.c
 obj/main.o: src/main.c
 obj/generation.o: src/generation.c
 obj/display.o: src/display.c
+obj/entities.o: src/entities.c
 obj/move.o: src/move.c
 obj/base.o: src/base.c
 obj/hash.o: src/hash.c
diff --git a/bin/back b/bin/back
index c7b79b5..909171d 100755
Binary files a/bin/back and b/bin/back differ
diff --git a/obj/display.o b/obj/display.o
index 8e57dc0..5dde95e 100644
Binary files a/obj/display.o and b/obj/display.o differ
diff --git a/obj/entities.o b/obj/entities.o
new file mode 100644
index 0000000..3d133c8
Binary files /dev/null and b/obj/entities.o differ
diff --git a/obj/main.o b/obj/main.o
index 7701bf7..cd9ad26 100644
Binary files a/obj/main.o and b/obj/main.o differ
diff --git a/src/display.c b/src/display.c
index 4bd6d98..db4449e 100644
--- a/src/display.c
+++ b/src/display.c
@@ -15,6 +15,7 @@
 #include "structure.h"
 #include "base.h"
 #include "move.h"
+#include "entities.h"
 #include "generation.h"
 #include "display.h"
 
diff --git a/src/entities.c b/src/entities.c
new file mode 100644
index 0000000..0c1ff1d
--- /dev/null
+++ b/src/entities.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <math.h>
+#include <stdbool.h>
+#include <ncurses.h>
+#include <unistd.h>
+#include <termios.h>
+#include <limits.h>
+#include <time.h>
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_image.h>
+
+#include "hash.h"
+#include "structure.h"
+#include "base.h"
+#include "entities.h"
+
+// ------------------------------------------------------------------------------------------------------------------------------------------------ //
+
+bool is_colliding_with_map(cube_0 cb) {
+    for(int k = 0; k < current_room->map_size; k++) {
+        for(int d = 0; d < 8; d++) {
+            if(distance_pt_cube_0_3d(cb.x+cb.w*(d%2==0), cb.y+cb.h*((d/2)%2==0), cb.z+cb.d*((d/4)%2==0), current_room->map[k]) <= 0.01) {
+                return true ;
+            }
+        }
+    }
+    return false ;
+}
+
+bool is_colliding_with_tp(cube_0 cb) {
+    for(int k = 0; k < current_room->tps_size; k++) {
+        for(int d = 0; d < 8; d++) {
+            if(distance_pt_cube_0_3d(cb.x+cb.w*(d%2==0), cb.y+cb.h*((d/2)%2==0), cb.z+cb.d*((d/4)%2==0), current_room->tps[k].hitbox) <= 0.01) {
+                return true ;
+            }
+        }
+    }
+    return false ;
+}
+
+// ------------------------------------------------------------------------------------------------------------------------------------------------ //
+
+void update_entity(entity* ent) {
+    (*ent->updatePos)(ent->pos->x, ent->pos->y, ent->pos->z, ent->pos->w, ent->pos->h, ent->pos->d, ent->pos->hz_angle, ent->pos->vt_angle, ent->pos);
+}
\ No newline at end of file
diff --git a/src/entities.h b/src/entities.h
new file mode 100644
index 0000000..7c308d1
--- /dev/null
+++ b/src/entities.h
@@ -0,0 +1,5 @@
+#ifndef ENTITIES_H
+#define ENTITIES_H
+
+
+#endif
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index f4b9257..302a558 100644
--- a/src/main.c
+++ b/src/main.c
@@ -15,9 +15,12 @@
 #include "structure.h"
 #include "base.h"
 #include "move.h"
+#include "entities.h"
 #include "display.h"
 #include "generation.h"
 
+double sim_time ;
+
 int main(int argc, char** argv) {
     srand(time(NULL));
 
@@ -44,12 +47,17 @@ int main(int argc, char** argv) {
     SDL_SetRelativeMouseMode(true) ;
 
     /* -------------------------------------------------------- */
+    int fps = 60 ;
+    int interval = 1000000/fps ;
+    double intervalf = 1.0/((double)(fps)) ;
+
     init_csts() ;
     init_hashtbl() ;
     init_draworder() ;
     parse_rooms(3);
     import_digits(rend) ;
     import_letters(rend) ;
+    sim_time = 0.0 ;
     clock_t origin = clock();
     clock_t finish = clock();
     float delta;
@@ -66,8 +74,10 @@ int main(int argc, char** argv) {
 
         delta = ((float)finish - (float)origin)/CLOCKS_PER_SEC;
         drawNumberToRenderer(rend, digits, (int)(1.0f/delta), 720, 60, 75/2, 105/2, 0);
+        drawNumberToRenderer(rend, digits, (int)(10*sim_time), 720, 110, 75/2, 105/2, 0);
         updateRenderer(rend) ;
-        usleep(1000000/60) ;
+        sim_time += delta + intervalf ;
+        usleep(interval) ;
     }
     free_digits(digits) ;
 
diff --git a/src/move.h b/src/move.h
index 84688c5..375ee1d 100644
--- a/src/move.h
+++ b/src/move.h
@@ -2,6 +2,7 @@
 #define MOVE_H
 
 void init_csts();
+bool is_colliding();
 void playerActions();
 
 #endif
\ No newline at end of file
diff --git a/src/structure.h b/src/structure.h
index d2f847e..674e4e2 100644
--- a/src/structure.h
+++ b/src/structure.h
@@ -29,6 +29,13 @@ typedef struct teleporter {
     double dest_z ;
 } teleporter ;
 
+typedef struct entity {
+    cube_0* pos ;
+    void (*updatePos)(double x, double y, double z, double w, double h, double d, double hz_angle, double vt_angle, cube_0* ret) ;    // act as velocity function
+    int damage ;
+    int hitpoints ;
+} entity ;
+
 struct room {
     // (0, 0, 0) = bottom, left and down
     int chunk_x ;
@@ -61,6 +68,8 @@ typedef hashtbl_0* hashtbl ;
 
 // ------------------------------------------------ //
 
+extern double sim_time ;
+
 extern imgs digits ;
 extern imgs letters ;