CARLA_0.9.6/PythonAPI/carla/agents/navigation/carla_env.py [150:223]:
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        self.altitude = 0.5 * (max_alt + min_alt) + 0.5 * (max_alt - min_alt) * math.cos(self._t)

    def __str__(self):
        return 'Sun(alt: %.2f, azm: %.2f)' % (self.altitude, self.azimuth)


class Storm(object):
    def __init__(self, precipitation):
        self._t = precipitation if precipitation > 0.0 else -50.0
        self._increasing = True
        self.clouds = 0.0
        self.rain = 0.0
        self.wetness = 0.0
        self.puddles = 0.0
        self.wind = 0.0
        self.fog = 0.0

    def tick(self, delta_seconds):
        delta = (1.3 if self._increasing else -1.3) * delta_seconds
        self._t = clamp(delta + self._t, -250.0, 100.0)
        self.clouds = clamp(self._t + 40.0, 0.0, 60.0)
        self.rain = clamp(self._t, 0.0, 80.0)
        self.wind = 5.0 if self.clouds <= 20 else 90 if self.clouds >= 70 else 40
        if self._t == -250.0:
            self._increasing = True
        if self._t == 100.0:
            self._increasing = False

    def __str__(self):
        return 'Storm(clouds=%d%%, rain=%d%%, wind=%d%%)' % (self.clouds, self.rain, self.wind)


class Weather(object):
    def __init__(self, world, changing_weather_speed):
        self.world = world
        self.reset()
        self.weather = world.get_weather()
        self.changing_weather_speed = changing_weather_speed
        self._sun = Sun(self.weather.sun_azimuth_angle, self.weather.sun_altitude_angle)
        self._storm = Storm(self.weather.precipitation)

    def reset(self):
        weather_params = carla.WeatherParameters(sun_altitude_angle=90.)
        self.world.set_weather(weather_params)

    def tick(self):
        self._sun.tick(self.changing_weather_speed)
        self._storm.tick(self.changing_weather_speed)
        self.weather.cloudiness = self._storm.clouds
        self.weather.precipitation = self._storm.rain
        self.weather.precipitation_deposits = self._storm.puddles
        self.weather.wind_intensity = self._storm.wind
        self.weather.fog_density = self._storm.fog
        self.weather.wetness = self._storm.wetness
        self.weather.sun_azimuth_angle = self._sun.azimuth
        self.weather.sun_altitude_angle = self._sun.altitude
        self.world.set_weather(self.weather)

    def __str__(self):
        return '%s %s' % (self._sun, self._storm)


class CarlaEnv(object):

    def __init__(self,
                 render_display=0,  # 0, 1
                 record_display_images=0,  # 0, 1
                 record_rl_images=0,  # 0, 1
                 changing_weather_speed=0.0,  # [0, +inf)
                 display_text=0,  # 0, 1
                 rl_image_size=84,
                 max_episode_steps=1000,
                 frame_skip=1,
                 is_other_cars=True,
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CARLA_0.9.8/PythonAPI/carla/agents/navigation/carla_env.py [149:222]:
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        self.altitude = 0.5 * (max_alt + min_alt) + 0.5 * (max_alt - min_alt) * math.cos(self._t)

    def __str__(self):
        return 'Sun(alt: %.2f, azm: %.2f)' % (self.altitude, self.azimuth)


class Storm(object):
    def __init__(self, precipitation):
        self._t = precipitation if precipitation > 0.0 else -50.0
        self._increasing = True
        self.clouds = 0.0
        self.rain = 0.0
        self.wetness = 0.0
        self.puddles = 0.0
        self.wind = 0.0
        self.fog = 0.0

    def tick(self, delta_seconds):
        delta = (1.3 if self._increasing else -1.3) * delta_seconds
        self._t = clamp(delta + self._t, -250.0, 100.0)
        self.clouds = clamp(self._t + 40.0, 0.0, 60.0)
        self.rain = clamp(self._t, 0.0, 80.0)
        self.wind = 5.0 if self.clouds <= 20 else 90 if self.clouds >= 70 else 40
        if self._t == -250.0:
            self._increasing = True
        if self._t == 100.0:
            self._increasing = False

    def __str__(self):
        return 'Storm(clouds=%d%%, rain=%d%%, wind=%d%%)' % (self.clouds, self.rain, self.wind)


class Weather(object):
    def __init__(self, world, changing_weather_speed):
        self.world = world
        self.reset()
        self.weather = world.get_weather()
        self.changing_weather_speed = changing_weather_speed
        self._sun = Sun(self.weather.sun_azimuth_angle, self.weather.sun_altitude_angle)
        self._storm = Storm(self.weather.precipitation)

    def reset(self):
        weather_params = carla.WeatherParameters(sun_altitude_angle=90.)
        self.world.set_weather(weather_params)

    def tick(self):
        self._sun.tick(self.changing_weather_speed)
        self._storm.tick(self.changing_weather_speed)
        self.weather.cloudiness = self._storm.clouds
        self.weather.precipitation = self._storm.rain
        self.weather.precipitation_deposits = self._storm.puddles
        self.weather.wind_intensity = self._storm.wind
        self.weather.fog_density = self._storm.fog
        self.weather.wetness = self._storm.wetness
        self.weather.sun_azimuth_angle = self._sun.azimuth
        self.weather.sun_altitude_angle = self._sun.altitude
        self.world.set_weather(self.weather)

    def __str__(self):
        return '%s %s' % (self._sun, self._storm)


class CarlaEnv(object):

    def __init__(self,
                 render_display=0,  # 0, 1
                 record_display_images=0,  # 0, 1
                 record_rl_images=0,  # 0, 1
                 changing_weather_speed=0.0,  # [0, +inf)
                 display_text=0,  # 0, 1
                 rl_image_size=84,
                 max_episode_steps=1000,
                 frame_skip=1,
                 is_other_cars=True,
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