Update app.py

app.py

@@ -34,7 +34,25 @@ def add_planet(name, radius, mass, distance_from_sun):
     planet.name = name
     planet.data.materials.append(material)
     planet["mass"] = mass
-    return planet
+    bpy.context.view_layer.objects.active = planet
+    planet.select_set(True)
+    planet.animation_data_create()
+    planet.animation_data.action = bpy.data.actions.new(name="OrbitAction")
+    start_frame = 1
+    end_frame = int(duration * 10)
+    for frame in range(start_frame, end_frame + 1):
+        ##angle = (frame / end_frame) * 2 * math.pi
+        ##x = radius * math.cos(angle)
+        ##y = planet.location.y
+        ##z = radius * math.sin(angle)
+        ##planet.location = (x, y, z)
+        ##planet.keyframe_insert(data_path="location", index=-1, frame=frame)
+        angle = math.radians(frame * 18)
+        planet.rotation_euler = (0, 0, angle)
+        planet.rotation_mode = 'XYZ'
+        planet.keyframe_insert(data_path="rotation_euler", index=2, frame=start_frame)
+        planet.keyframe_insert(data_path="rotation_euler", index=2, frame=end_frame)
+    ##return planet
 
 def create_planet_flyby_animation(planet, radius, duration):
     bpy.context.view_layer.objects.active = planet