diff --git a/sim_scenes/wonders/comets_jupiter.py b/sim_scenes/wonders/comets_jupiter.py
index 89cdd4addf9690c76afd92604220f3e00d926e31..242f1b1524bebf4caac9113db7688d0a88f75dbe 100644
--- a/sim_scenes/wonders/comets_jupiter.py
+++ b/sim_scenes/wonders/comets_jupiter.py
@@ -17,9 +17,9 @@ from simulators.ursina.ursina_event import UrsinaEvent
 
 def create_comet(index, gravity_only_for):
     """
-    随机生成石头
+    随机生成石头（随机位置、随机初始速度、随机大小、随机旋转）
     @param index: 索引号
-    @param gravity_only_for: 指定一个天体，石头的引力只对该天体有效
+    @param gravity_only_for: 指定一个天体，石头只对该天体引力有效
     @return:
     """
     # 随机生成石头的位置和初始速度信息
@@ -31,11 +31,11 @@ def create_comet(index, gravity_only_for):
     # 石头随机大小
     size_scale = random.randint(600, 1200)
     # 随机创建石头
-    comet = create_rock(no=index % 8 + 1, name=f'岩石{index + 1}', mass=4.4e10,
-                        size_scale=size_scale, color=(255, 200, 0),
-                        init_position=pos, init_velocity=vel,
-                        gravity_only_for=[gravity_only_for],
-                        )
+    comet = create_rock(
+        no=index % 8 + 1, name=f'岩石{index + 1}', mass=4.4e10,
+        size_scale=size_scale, color=(255, 200, 0),
+        init_position=pos, init_velocity=vel, gravity_only_for=[gravity_only_for],
+    )
 
     # 给石头一个随机旋转的方向和值
     comet.rotation = [0, 0, 0]
@@ -64,6 +64,18 @@ if __name__ == '__main__':
         comets.append(comet)
 
 
+    def on_timer_changed(time_data: TimeData):
+        # 运行中，每时每刻都会触发
+        for comet in comets:
+            if comet.visibled:
+                # 如果是否可见，则旋转石头
+                comet.planet.rotation += comet.rotation
+                # 循环判断每个石头与木星是否相碰撞，如果相碰撞就爆炸
+                if two_bodies_colliding(comet, jupiter):
+                    # 将石头隐藏、设置引力无效后，展示爆炸效果
+                    comet.explode(jupiter)
+
+
     def on_reset():
         """
         当按键盘的 “O” 键重置后，恢复所有石头的状态（石头可见、引力有效），这样就可以反复观看
@@ -76,24 +88,12 @@ if __name__ == '__main__':
 
     def on_ready():
         # 运行前触发
-        # 创建太阳光
+        # 为了较好的立体效果，可以增加太阳光线，光线指向木星（target=jupiter）
         create_directional_light(position=(200, 0, -300), target=jupiter)
         # 摄像机看向木星
         camera_look_at(jupiter, rotation_z=0)
 
 
-    def on_timer_changed(time_data: TimeData):
-        # 运行中，每时每刻都会触发
-        for comet in comets:
-            if comet.visibled:
-                # 如果是否可见，则旋转石头
-                comet.planet.rotation += comet.rotation
-                # 循环判断每个石头与木星是否相碰撞，如果相碰撞就爆炸
-                if two_bodies_colliding(comet, jupiter):
-                    # 将石头隐藏、设置引力无效后，展示爆炸效果
-                    comet.explode(jupiter)
-
-
     # 订阅事件后，上面3个函数功能才会起作用
     # 按键盘的 “O” 重置键会触发 on_reset
     UrsinaEvent.on_reset_subscription(on_reset)
diff --git a/simulators/ursina/entities/entity_utils.py b/simulators/ursina/entities/entity_utils.py
index f43fbc69db6c17784f0100b7d450cd5ec4806140..e9e7706224866cd5034bc6c5779cd4a8d1c96254 100644
--- a/simulators/ursina/entities/entity_utils.py
+++ b/simulators/ursina/entities/entity_utils.py
@@ -171,13 +171,13 @@ def create_directional_light(position, target=None, shadows=False, light_color=N
     from ursina.shaders import lit_with_shadows_shader
     from ursina import Vec2, Vec4, Entity
 
-    shader = lit_with_shadows_shader
-    shader.default_input = {
-        'texture_scale': Vec2(1, 1),
-        'texture_offset': Vec2(0, 0),
-        'shadow_color': Vec4(0.1, 0.1, 0.1, .5),
-    }
-    Entity.default_shader = shader
+    # shader = lit_with_shadows_shader
+    # shader.default_input = {
+    #     'texture_scale': Vec2(1, 1),
+    #     'texture_offset': Vec2(0, 0),
+    #     'shadow_color': Vec4(0.1, 0.1, 0.1, .5),
+    # }
+    # Entity.default_shader = shader
 
     if shadows:
         Entity.default_shader = lit_with_shadows_shader
@@ -185,6 +185,7 @@ def create_directional_light(position, target=None, shadows=False, light_color=N
         light_color = color.white
     else:
         light_color = color.rgba(light_color[0] / 255, light_color[1] / 255, light_color[2] / 255, 1)
+
     light = DirectionalLight(position=position, intensity=10, range=10, color=light_color)
 
     if shadows: