Opendrive map support from SUMO (#744)

* sumo mpa support

* format

* add doc string

* format

metadrive/component/map/scenario_map.py

@@ -15,7 +15,7 @@ class ScenarioMap(BaseMap):
     def __init__(self, map_index, map_data, random_seed=None):
         self.map_index = map_index
         self.map_data = map_data
-        self.need_lane_localization = self.engine.global_config["need_lane_localization"]
+        self.need_lane_localization = self.engine.global_config.get("need_lane_localization", False)
         super(ScenarioMap, self).__init__(dict(id=self.map_index), random_seed=random_seed)
 
     def show_coordinates(self):

metadrive/manager/sumo_map_manager.py

@@ -0,0 +1,42 @@
+from metadrive.component.map.scenario_map import ScenarioMap
+from metadrive.manager.base_manager import BaseManager
+from metadrive.utils.sumo.map_utils import extract_map_features, RoadLaneJunctionGraph
+
+
+class SumoMapManager(BaseManager):
+    """
+    It currently only support load one map into the simulation.
+    """
+    PRIORITY = 0  # Map update has the most high priority
+
+    def __init__(self, sumo_map_path):
+        """
+        Init the map manager. It can be extended to manage more maps
+        """
+        super(SumoMapManager, self).__init__()
+        self.current_map = None
+        self.graph = RoadLaneJunctionGraph(sumo_map_path)
+        self.map_feature = extract_map_features(self.graph)
+
+    def destroy(self):
+        """
+        Delete the map manager
+        """
+        self.current_map.destroy()
+        super(SumoMapManager, self).destroy()
+        self.current_map = None
+
+    def before_reset(self):
+        """
+        Detach existing maps
+        """
+        if self.current_map:
+            self.current_map.detach_from_world()
+
+    def reset(self):
+        """
+        Rebuild the map and load it into the scene
+        """
+        if not self.current_map:
+            self.current_map = ScenarioMap(map_index=0, map_data=self.map_feature)
+        self.current_map.attach_to_world()

metadrive/tests/vis_env/vis_sumo_map.py

@@ -0,0 +1,50 @@
+"""use netconvert --opendrive-files CARLA_town01.net.xml first"""
+
+from metadrive.envs import BaseEnv
+from metadrive.obs.observation_base import DummyObservation
+import logging
+from metadrive.manager.sumo_map_manager import SumoMapManager
+from metadrive.engine.asset_loader import AssetLoader
+
+
+class MyEnv(BaseEnv):
+    def reward_function(self, agent):
+        """Dummy reward function."""
+        return 0, {}
+
+    def cost_function(self, agent):
+        """Dummy cost function."""
+        return 0, {}
+
+    def done_function(self, agent):
+        """Dummy done function."""
+        return False, {}
+
+    def get_single_observation(self):
+        """Dummy observation function."""
+        return DummyObservation()
+
+    def setup_engine(self):
+        """Register the map manager"""
+        super().setup_engine()
+        map_path = AssetLoader.file_path("carla", "CARLA_town01.net.xml", unix_style=False)
+        self.engine.register_manager("map_manager", SumoMapManager(map_path))
+
+
+if __name__ == "__main__":
+    # create env
+    env = MyEnv(
+        dict(
+            use_render=True,
+            # if you have a screen and OpenGL suppor, you can set use_render=True to use 3D rendering
+            vehicle_config={"spawn_position_heading": [(0, 0), 0]},
+            manual_control=True,  # we usually manually control the car to test environment
+            use_mesh_terrain=True,
+            log_level=logging.CRITICAL
+        )
+    )  # suppress logging message
+    env.reset()
+    for i in range(10000):
+        # step
+        obs, reward, termination, truncate, info = env.step(env.action_space.sample())
+    env.close()