太阳系三体模拟器

scenes/solar_system_1.py

@@ -6,8 +6,8 @@
 # link            :https://gitcode.net/pythoncr/
 # python_version  :3.8
 # ==============================================================================
-from bodies import Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Moon
-from common.consts import SECONDS_PER_WEEK, SECONDS_PER_DAY, SECONDS_PER_YEAR
+from bodies import Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Moon, Asteroids
+from common.consts import SECONDS_PER_WEEK, SECONDS_PER_DAY, SECONDS_PER_YEAR, AU
 from scenes.func import mayavi_run, ursina_run
 
 if __name__ == '__main__':
@@ -19,21 +19,24 @@ if __name__ == '__main__':
     #  =====================================================================
     #  以下展示的效果为太阳系真实的距离
     #  由于宇宙空间尺度非常大，如果按照实际的天体大小，则无法看到天体，因此需要对天体的尺寸进行放大
+    sun = Sun(name="太阳", size_scale=0.8e2)       # 太阳放大 80 倍，距离保持不变
     bodies = [
-        Sun(size_scale=0.8e2),      # 太阳放大 80 倍，距离保持不变
-        Mercury(size_scale=4e3),    # 水星放大 4000 倍，距离保持不变
-        Venus(size_scale=4e3),      # 金星放大 4000 倍，距离保持不变
-        Earth(size_scale=4e3),      # 地球放大 4000 倍，距离保持不变
-        Mars(size_scale=4e3),       # 火星放大 4000 倍，距离保持不变
-        Jupiter(size_scale=0.8e3),  # 木星放大 800 倍，距离保持不变
-        Saturn(size_scale=0.8e3),   # 土星放大 800 倍，距离保持不变
-        Uranus(size_scale=0.8e3),   # 天王星放大 800 倍，距离保持不变
-        Neptune(size_scale=1e3),    # 海王星放大 1000 倍，距离保持不变
-        Pluto(size_scale=10e3),     # 冥王星放大 10000 倍，距离保持不变(从太阳系的行星中排除)
+        sun,
+        Mercury(name="水星", size_scale=4e3),      # 水星放大 4000 倍，距离保持不变
+        Venus(name="金星", size_scale=4e3),        # 金星放大 4000 倍，距离保持不变
+        Earth(name="地球", size_scale=4e3),        # 地球放大 4000 倍，距离保持不变
+        Mars(name="火星", size_scale=4e3),         # 火星放大 4000 倍，距离保持不变
+        Asteroids(name="小行星群", size_scale=3.2e2,
+                  parent=sun),                     # 小行星群模拟(仅 ursina 模拟器支持)
+        Jupiter(name="木星", size_scale=0.8e3),    # 木星放大 800 倍，距离保持不变
+        Saturn(name="土星", size_scale=0.8e3),     # 土星放大 800 倍，距离保持不变
+        Uranus(name="天王星", size_scale=0.8e3),   # 天王星放大 800 倍，距离保持不变
+        Neptune(name="海王星", size_scale=1e3),    # 海王星放大 1000 倍，距离保持不变
+        Pluto(name="冥王星", size_scale=10e3),     # 冥王星放大 10000 倍，距离保持不变(从太阳系的行星中排除)
     ]
 
     # 使用 mayavi 查看的运行效果
     # mayavi_run(bodies, SECONDS_PER_WEEK, view_azimuth=-45)
 
     # 使用 ursina 查看的运行效果
-    ursina_run(bodies, SECONDS_PER_YEAR, position=(0, 0, 0))
+    ursina_run(bodies, SECONDS_PER_YEAR, position=(0, 5 * AU, -10 * AU))  # position=左-右+、上+下-、前+后-
\ No newline at end of file

simulators/ursina/ursina_ui.py

@@ -149,15 +149,57 @@ class UrsinaUI:
         else:
             UrsinaConfig.show_trail = False
 
+    def move_camera_to_entity(self, camera_pos: Vec3, entity_pos: Vec3, _distance: float) -> Vec3:
+        # 计算摄像机到实体的向量
+        direction = entity_pos - camera_pos
+        # 计算当前距离
+        current_distance = direction.length()
+        # 如果当前距离已经小于等于要求的距离，则直接返回实体坐标
+        if current_distance <= _distance:
+            return camera_pos
+        # 计算需要移动的距离
+        _distance = current_distance - _distance
+        # 根据需要移动的距离计算移动向量
+        move_vector = direction.normalized() * _distance
+        # 返回摄像机移动后的坐标
+        return camera_pos + move_vector
+
+    def move_camera_to_entity(self,entity,d):
+        import math
+        # print("before",camera.position, entity.position)
+        camera.position = entity.position #- Vec3(0, 0, d)  # 设置摄像机位置
+        camera.world_position = entity.position
+        # camera.rotation = (0, 0, 0)  # 重置摄像机旋转角度
+
+        # print("after",camera.position,entity.position)
+
+        # # 获取相机和实体之间的向量
+        # target_vector = entity.position - camera.position
+        # target_vector.y = 0  # 假设实体在 x-z 平面上，将 y 坐标设为 0
+        #
+        # # 计算旋转角度
+        # angle = math.degrees(math.atan2(target_vector.z, target_vector.x))
+        # camera.rotation_y = angle  # 旋转相机
+
+        # camera.look_at(entity.position)  # 对准指定实体
+
     def bodies_button_list_click(self, item):
         if item is not None:
             # TODO: 先找到位置，确定摄像机的位置
             # print("select->", item)
             # UrsinaConfig.SCALE_FACTOR
-            x = item.planet.scale_x * 10
-            camera.position = item.planet.position + Vec3(-x, 0, 0)
-            camera.look_at(item.planet)
-            camera.rotation = (0, 90, 0)
+            # import copy
+            # camera_rotation = copy.deepcopy(camera.rotation)
+            d = item.planet.scale_x * 20
+            self.move_camera_to_entity(item.planet, d)
+            # d = distance(camera.position, item.planet.position)
+            # camera.look_at(item.planet)
+            # if d > 1.5 * x:
+            #     move_to = self.move_camera_to_entity(camera.position, item.planet.position, x)
+            #     camera.position = move_to
+
+            # camera_rotation = copy.deepcopy(camera.rotation)
+            # camera.rotation = (camera_rotation[0], camera_rotation[1], 0)
             # camera.forward = (1, 0, 0)  # 设置相机的方向向量为x轴方向
 
         destroy(self.bodies_button_list)
@@ -193,11 +235,14 @@ class UrsinaUI:
                     name = f"{body.name}\t距离：{d:.4f}天文单位"
                     button_dict[name] = callback_action
                 else:
+                    if hasattr(self, "bodies_button_list"):
+                        destroy(self.bodies_button_list)
                     name = f"{body.name}\t距离太远，找不到了"
                     button_dict[name] = lambda: self.bodies_button_list_click(None)
 
             if hasattr(self, "bodies_button_list"):
                 destroy(self.bodies_button_list)
+
             self.bodies_button_list = ButtonList(button_dict, font=UrsinaConfig.CN_FONT, button_height=1.5)
             # self.bodies_button_list.input = self.bodies_button_list_input
 
@@ -235,11 +280,11 @@ class UrsinaUI:
     def on_slider_run_speed_changed(self):
         UrsinaConfig.run_speed_factor = self.slider_run_speed_factor.value
 
-    def show_text_time_scale_info(self):
-        if self.text_time_scale_info is not None:
-            self.text_time_scale_info.disable()
-        text_time_scale = "控制倍率:" + str(application.time_scale).ljust(4, " ")
-        text_time_scale_info = Text(text=text_time_scale, position=(-0.8, 0.5), origin=(-1, 1), background=True)
+    # def show_text_time_scale_info(self):
+    #     if self.text_time_scale_info is not None:
+    #         self.text_time_scale_info.disable()
+    #     text_time_scale = "控制倍率:" + str(application.time_scale).ljust(4, " ")
+    #     text_time_scale_info = Text(text=text_time_scale, position=(-0.8, 0.5), origin=(-1, 1), background=True)
 
     # def show_button(self):
     #     b = Button(scale=(0, .25), text='zzz')

simulators/ursina_simulator.py

@@ -168,6 +168,14 @@ class UrsinaSimulator(Simulator):
     def run(self, dt, **kwargs):
 
         window.title = '宇宙模拟器'
+
+        # 设置 camera 的裁剪面和位置
+        # camera.clip_plane_near = 0.00000009
+        # camera.fov = 120
+        # camera.clip_plane_far = 1000
+        # camera.position = (0, 10, -20)
+        # camera.rotation_x = -30
+
         # 设定时间间隔为0.01秒
         interval = 0.01
         self.evolve_dt = dt * interval
@@ -194,12 +202,6 @@ class UrsinaSimulator(Simulator):
             if cosmic_bg is not None and os.path.exists(cosmic_bg):
                 self.cosmic_background(cosmic_bg)
 
-        # 设置 camera 的裁剪面和位置
-        camera.clip_plane_near = 0.1
-        # camera.clip_plane_far = 1000
-        # camera.position = (0, 10, -20)
-        # camera.rotation_x = -30
-
         ui = UrsinaUI()
         EditorCamera(ignore_paused=True)
         # 防止打开中文输入法

simulators/views/ursina_view.py

@@ -47,7 +47,7 @@ class UrsinaPlayer(FirstPersonController):
             #
             # camera.add_script(SmoothFollow(targets_parent, offset=(0, 8, -20)))
         pos = np.array(position) * UrsinaConfig.SCALE_FACTOR
-        # self.position = Vec3(pos[0], pos[1], pos[2])
+        self.position = Vec3(pos[0], pos[1], pos[2])
         # 将摄像机位置设置为 x=0、y=1、z=0 的位置
         camera.position = Vec3(pos[0], pos[1], pos[2])
         # self.position = Vec3(pos[0], pos[1], pos[2])
@@ -95,7 +95,7 @@ class Planet(Entity):
 
         if hasattr(self.body_view.body, "torus_stars"):
             # 创建一个星环小天体群（主要模拟小行星群，非一个天体）
-            model = create_torus(0.86, 1.02, 64, 4)
+            model = create_torus(0.75, 1.10, 64, 1)
             rotation = (90, 0, 0)
         else:
             # 创建一个天体