Update app.py

app.py

@@ -42,6 +42,8 @@ def add_planet(name, radius, mass, distance_from_sun):
     duration=2
     end_frame = int(duration * 10)
     planet.rotation_mode = 'XYZ'
+    planet.keyframe_insert(data_path="rotation_euler", index=2, frame=start_frame)
+    
     for frame in range(start_frame, end_frame + 1):
         ##angle = (frame / end_frame) * 2 * math.pi
         ##x = radius * math.cos(angle)
@@ -51,8 +53,7 @@ def add_planet(name, radius, mass, distance_from_sun):
         ##planet.keyframe_insert(data_path="location", index=-1, frame=frame)
         angle = math.radians(frame * 18)
         planet.rotation_euler = (0, 0, angle)
-    planet.keyframe_insert(data_path="rotation_euler", index=2, frame=start_frame)
-    planet.keyframe_insert(data_path="rotation_euler", index=2, frame=end_frame)
+        planet.keyframe_insert(data_path="rotation_euler", index=-1, frame=frame)
     ##return planet
 
 def create_planet_flyby_animation(planet, radius, duration):