diff --git a/src/app.py b/src/app.py
index a82ff45..4fbe8ba 100644
--- a/src/app.py
+++ b/src/app.py
@@ -6,7 +6,7 @@ class App:
 
     def __init__(self):
         self.renderer = Renderer(1280, 720)
-        self.renderer.caption = "Virtual camera"
+        self.renderer.caption = "3D Renderer"
 
     def main(self):
         obj_builder1 = ObjectBuilder()
@@ -31,7 +31,7 @@ class App:
         obj_builder1.add_vertices_connection(vd, vh)
         obj_builder1.add_vertices_connection(vc, vg)
         self.renderer.add_object(obj_builder1.build())
-
+        
         obj_builder2 = ObjectBuilder()
         wa = obj_builder2.add_vertex(-2, 0,  2)
         wb = obj_builder2.add_vertex( 2, 0,  2)
diff --git a/src/object.py b/src/object.py
index be7a3a1..f32d367 100644
--- a/src/object.py
+++ b/src/object.py
@@ -17,19 +17,23 @@ class Object:
     def draw(self):
         vertices_matrix = np.array([[v.x, v.y, v.z, 1.0] for v in self.vertices])
         vertices_matrix = vertices_matrix @ self.__renderer.camera.camera_matrix()
+        hidden_vertices = [row[0, 2] <= 0 for row in vertices_matrix]
         vertices_matrix = vertices_matrix @ self.__renderer.camera.projection_matrix()
         vertices_matrix /= vertices_matrix[:, -1].reshape(-1, 1)
         vertices_matrix = vertices_matrix @ self.__renderer.camera.screen_matrix()
         vertices_matrix = vertices_matrix[:, :2]
         vertices = {}
         for i in range(len(self.vertices)):
-            vertices[self.vertices[i]] = vertices_matrix[i].tolist()[0]
+            if not hidden_vertices[i]:
+                vertices[self.vertices[i]] = vertices_matrix[i].tolist()[0]
 
         for v in vertices.values():
             pg.draw.circle(self.__renderer.screen, pg.Color("black"), v, 2)
         for l in self.lines:
-            v1 = vertices[l[0]]
-            v2 = vertices[l[1]]
+            v1 = vertices.get(l[0])
+            v2 = vertices.get(l[1])
+            if (v1 is None or v2 is None):
+                continue
             pg.draw.line(self.__renderer.screen, pg.Color("black"), v1, v2, 1)
         
         
\ No newline at end of file