Fix error

tray_sim.py

@@ -32,7 +32,8 @@ def run_tray_simulation(seed=0, num_objects=N_OBJECTS, azimuth=45, elevation=-25
     renderer = mujoco.Renderer(model, width=480, height=480) # width=640, height=640
 
     # Custom camera parameters
-    cam = renderer.cam
+    scene_option = mujoco.MjvOption()
+    cam = mujoco.MjvCamera()
     cam.type = mujoco.mjtCamera.mjCAMERA_FREE
     cam.lookat[:] = np.array([0.0, 0.0, 0.02])     # Center of the tray
     cam.distance = distance                        # Zoom
@@ -48,7 +49,7 @@ def run_tray_simulation(seed=0, num_objects=N_OBJECTS, azimuth=45, elevation=-25
             data.qvel[pusher_vel_idx:pusher_vel_idx+3] = [-0.05, 0.05, 0.0]  # toward center
 
         mujoco.mj_step(model, data)
-        renderer.update_scene(data)
+        renderer.update_scene(data, camera=cam, scene_option=scene_option)
         img = renderer.render()
 
         if t in keyframes: