Use native mujoco viewer for "human" render mode

deformable_gym/envs/mujoco/base_mjenv.py

@@ -60,6 +60,8 @@ class BaseMJEnv(gym.Env, ABC):
         The space representing possible actions that can be taken by the agent.
     """
 
+    metadata = {"render_modes": ["human", "rgb_array", "depth_array"]}
+
     def __init__(
         self,
         robot_name: str,
@@ -89,16 +91,38 @@ def __init__(
                 self.mocap = MocapControl()
         self.init_frame = init_frame
         self.max_sim_time = max_sim_time
+        if render_mode is not None:
+            assert render_mode in self.metadata["render_modes"]
         self.render_mode = render_mode
         self.camera_name = camera_name
         self.camera_id = camera_id
-        self.renderer = MujocoRenderer(
-            self.model, self.data, default_cam_config
-        )
+        self.renderer = self._get_renderer(default_cam_config)
 
         self.observation_space = self._get_observation_space()
         self.action_space = self._get_action_space()
 
+    def _get_renderer(self, default_cam_config: Dict[str, Any] | None):
+        """
+        Returns the renderer object for the environment.
+
+        Returns:
+            MujocoRenderer or mujoco.viewer: The renderer object for the environment.
+        """
+        if self.render_mode == "human":
+            renderer = mujoco.viewer.launch_passive(
+                self.model, self.data, show_left_ui=False, show_right_ui=False
+            )
+            if default_cam_config is not None:
+                for attr, value in default_cam_config.items():
+                    setattr(renderer.cam, attr, value)
+        elif (
+            self.render_mode == "rgb_array" or self.render_mode == "depth_array"
+        ):
+            renderer = MujocoRenderer(self.model, self.data, default_cam_config)
+        else:
+            renderer = None
+        return renderer
+
     def _get_action_space(self) -> spaces.Box:
         """
         Defines the action space for the environment based on the robot's control range.
@@ -220,13 +244,16 @@ def render(self) -> None:
         """
         Render a frame from the MuJoCo simulation as specified by the render_mode.
         """
-
-        return self.renderer.render(
-            self.render_mode, self.camera_id, self.camera_name
-        )
+        if self.render_mode == "human":
+            self.renderer.sync()
+        elif (
+            self.render_mode == "rgb_array" or self.render_mode == "depth_array"
+        ):
+            return self.renderer.render(self.render_mode)
 
     def close(self) -> None:
         """
         Close the environment.
         """
-        self.renderer.close()
+        if self.renderer is not None:
+            self.renderer.close()