Randomize quad color for each instance. Misc fixes.

rotorpy/learning/quadrotor_environments.py

@@ -37,6 +37,7 @@ class QuadrotorEnv(gym.Env):
     """
 
     metadata = {"render_modes": ["None", "3D", "console"], 
+                "render_fps": 30,
                 "control_modes": ['cmd_motor_speeds', 'cmd_motor_thrusts', 'cmd_ctbr', 'cmd_ctbm', 'cmd_vel']}
 
     def __init__(self, 
@@ -53,7 +54,8 @@ class QuadrotorEnv(gym.Env):
                  wind_profile = None,         # wind profile object, if none is supplied it will choose no wind. 
                  world        = None,         # The world object
                  sim_rate = 100,              # The update frequency of the simulator in Hz
-                 render_mode = None,          # The rendering mode
+                 render_mode = "None",          # The rendering mode
+                 ax = None,
                 ):
         super(QuadrotorEnv, self).__init__()
 
@@ -66,7 +68,6 @@ class QuadrotorEnv(gym.Env):
 
         self.sim_rate = sim_rate
         self.t_step = 1/self.sim_rate
-        self.world = world
         self.reward_fn = reward_fn
 
         # Create quadrotor from quad params and control abstraction. 
@@ -151,7 +152,7 @@ class QuadrotorEnv(gym.Env):
             self.fig = plt.figure('Visualization')
             # self.fig.clear()
             self.ax = self.fig.add_subplot(projection='3d')
-            self.quad_obj = Quadrotor(self.ax, wind=True)
+            self.quad_obj = Quadrotor(self.ax, wind=True, color=np.random.rand(3))
             self.world_artists = None
             self.title_artist = self.ax.set_title('t = {}'.format(self.t))
 
@@ -168,7 +169,7 @@ class QuadrotorEnv(gym.Env):
             # Close the plots
             plt.close('all')
     
-    def reset(self, seed=None, initial_state='random', options={'pos_bound': -2, 'vel_bound': 0}):
+    def reset(self, seed=None, initial_state='random', options={'pos_bound': 2, 'vel_bound': 0}):
         """
         Reset the environment
         Inputs:
@@ -191,6 +192,7 @@ class QuadrotorEnv(gym.Env):
                         'vel_bound': the min/max velocity region for random placement
                                 
         """
+        assert options['pos_bound'] >= 0 and options['vel_bound'] >= 0 , "Bounds must be greater than or equal to 0."
 
         super().reset(seed=seed)