Python超人-宇宙模拟器

sim_scenes/solar_system/halley_comet_sim_02.py

@@ -117,8 +117,10 @@ class HalleyCometSim:
         @return:
         """
         # 创建天空
-        UrsinaConfig.trail_type = "line"
-        UrsinaConfig.trail_length = 91
+        # UrsinaConfig.trail_type = "line"
+        # UrsinaConfig.trail_length = 91
+        UrsinaConfig.trail_type = "curve_line"
+        UrsinaConfig.trail_length = 420
         # UrsinaConfig.trail_length = 1000
         UrsinaConfig.trail_thickness_factor = 3
         # camera.clip_plane_near = 0.1

simulators/ursina/entities/entity_utils.py

@@ -118,12 +118,20 @@ def create_trails(parent):
         # # 如果拖尾在天体的内部也不要生成
         # if self_pos_distance < self.scale_x + (self.trail_scale / 2):
         #     pass
+        if UrsinaConfig.trail_type == "curve_line":
+            # 如果位置比较近，就不创建拖尾了，保证拖尾间隔一定的距离
+            # if last_pos_distance < parent.trail_scale * trail_int_scale / 5:
+            if last_pos_distance < 10:
+                return
+        else:
             # 如果位置比较近，就不创建拖尾了，保证拖尾间隔一定的距离
             if last_pos_distance < parent.trail_scale * trail_int_scale:  # 间隔距离不小于1.2倍的拖尾球体
                 return
 
     if UrsinaConfig.trail_type == "line":
         trail = create_trail_line(parent, pos)  # 拖尾为线条
+    elif UrsinaConfig.trail_type == "curve_line":
+        trail = create_trail_curve_line(parent, pos)  # 拖尾为曲线条
     else:
         trail = create_trail_sphere(parent, pos)  # 拖尾为球体
 
@@ -247,6 +255,28 @@ def create_trail_line(parent, pos):
     return trail
 
 
+def create_trail_curve_line(parent, pos):
+    """
+    在天体当前的位置创建一个拖尾球体
+    @param pos:
+    @return:
+    """
+    trail = None
+    if hasattr(parent, "trail_last_pos"):
+        trail_last_pos = parent.trail_last_pos
+        if distance(pos, trail_last_pos) > 0:
+            trail = Entity(model=Mesh(
+                vertices=((pos[0], pos[1], pos[2]), (trail_last_pos[0], trail_last_pos[1], trail_last_pos[2])),
+                mode='line',
+                thickness=UrsinaConfig.trail_thickness_factor),
+                color=parent.trail_color, alpha=0.5)
+            trail.set_light_off()
+        parent.last_trail = trail
+
+    parent.trail_last_pos = pos
+    return trail
+
+
 def create_rings(parent):
     """
     创建行星环（使用土星贴图）

simulators/ursina/ursina_config.py

@@ -42,8 +42,8 @@ class UrsinaConfig:
 
     # 拖尾球体的数量
     trail_length = 100
-    # 拖尾的类型（球体、线条）
-    trail_type = "sphere"  # trail_type="line" or trail_type="sphere"
+    # 拖尾的类型（球体、线条、曲线条）
+    trail_type = "sphere"  # line sphere curve_line
     # 默认秒数（0表示默认）
     seconds_per = 0
     # # 控制摄像机动作速度（天体越大，速度越快，天体越小，速度越慢）