diff --git a/main.py b/main.py
index 7810307..ef99a1d 100644
--- a/main.py
+++ b/main.py
@@ -1,7 +1,9 @@
 import pygame as pg
 from math import pi
 from rigidbody import *
-from collider import LineCollider, CircleCollider
+from collider import RectCollider
+
+from tools import debug
 
 
 class Ball:
@@ -46,13 +48,14 @@ def main():
     pg.init()
     clock=pg.time.Clock()
     screen = pg.display.set_mode((500,500))
+    debug.enabled = True
+    debug._screen = screen
 
     physics = PhysicsSystem()
-
     linecollider = RectCollider((495, 1))
 
-    ball_transform = Transform(position=pg.Vector2(250,250), rotation=pi/8.0)
-    square_transform = Transform(position=pg.Vector2(250, 100))
+    ball_transform = Transform(position=pg.Vector2(250,440), rotation=pi/8.0)
+    square_transform = Transform(position=pg.Vector2(250, 460))
     #ball2_transform = Transform(position=pg.Vector2(250, 50))
 
     ball = Square(ball_transform, 20)
@@ -133,6 +136,7 @@ def main():
         physics.update(dt)
         ball.draw(screen)
         ball2.draw(screen)
+        debug.debug()
         #ball3.draw(screen)
         pg.display.flip()
         for event in pg.event.get():
diff --git a/tools.py b/tools.py
index 9eb81cc..7f6d2e9 100644
--- a/tools.py
+++ b/tools.py
@@ -1,7 +1,6 @@
 import pygame as pg
 from queue import Queue
 
-
 def _debug(fn):
     def wrapper(self: 'Debug', *args, **kwargs):
         if not self.enabled: return
@@ -48,4 +47,17 @@ class Debug:
         self._debug_queue.put(_draw_lines)
         
 
+    @_debug
+    def draw_collider(self, collider, t):
+        def _draw_collider():
+            h = collider.hull(t)
+            pg.draw.lines(
+                self._screen,
+                color=(0,255,255),
+                points=[v for v in h.vertices()],
+                closed=True
+            )
+        self._debug_queue.put(_draw_collider)
+
+
 debug = Debug()