diff --git a/environments/factory/base/base_factory.py b/environments/factory/base/base_factory.py
index f788ebe..df05fa7 100644
--- a/environments/factory/base/base_factory.py
+++ b/environments/factory/base/base_factory.py
@@ -11,7 +11,6 @@ from gym import spaces
 from gym.wrappers import FrameStack
 
 from environments.factory.base.shadow_casting import Map
-from environments.factory.renderer import Renderer, RenderEntity
 from environments.helpers import Constants as c, Constants
 from environments import helpers as h
 from environments.factory.base.objects import Agent, Tile, Action
@@ -545,6 +544,8 @@ class BaseFactory(gym.Env):
 
     def render(self, mode='human'):
         if not self._renderer:  # lazy init
+            from environments.factory.renderer import Renderer, RenderEntity
+            global Renderer, RenderEntity
             height, width = self._obs_cube.shape[1:]
             self._renderer = Renderer(width, height, view_radius=self._pomdp_r, fps=5)
 
diff --git a/studies/sat_mad.py b/studies/sat_mad.py
index 000e0bc..6b3b1f6 100644
--- a/studies/sat_mad.py
+++ b/studies/sat_mad.py
@@ -1,12 +1,29 @@
 from environments.factory import make
 import salina
+import torch
 from gym.wrappers import FrameStack
 
-n_agents = 4
-env = make('DirtyFactory-v0', n_agents=n_agents)
-env = FrameStack(env, num_stack=3)
-state, *_ = env.reset()
 
-for i in range(1000):
-    state, *_ = env.step([env.unwrapped.action_space.sample() for _ in range(n_agents)])
-    env.render()
\ No newline at end of file
+class MyAgent(salina.TAgent):
+    def __init__(self):
+        super(MyAgent, self).__init__()
+
+    def forward(self, t, **kwargs):
+        self.set(('timer', t), torch.tensor([t]))
+
+
+if __name__ == '__main__':
+    n_agents = 1
+    env = make('DirtyFactory-v0', n_agents=n_agents)
+    env = FrameStack(env, num_stack=3)
+    env.reset()
+    agent = MyAgent()
+    workspace = salina.Workspace()
+    agent(workspace, t=0, n_steps=10)
+
+    print(workspace)
+
+
+    for i in range(1000):
+        state, *_ = env.step([env.unwrapped.action_space.sample() for _ in range(n_agents)])
+        #env.render()
\ No newline at end of file