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# Objective The `SceneInstanceReady` event would be more ergonomic (and potentially efficient) if it could be delivered to listeners attached to the scene entities becoming ready rather than into a World-global queue. This is an evolution of @Shatur's work in #9313. ## Solution The scene spawner is changed to trigger observers on the scene entity when it is ready rather than enqueue an event with `EventWriter`. This addresses the two outstanding feature requests mentioned on #2218, that i) the events should be "scoped" in some way and ii) that the `InstanceId` should be included in the event. ## Testing Modified the `scene_spawner::tests::event` test to use the new mechanism. --- ## Changelog - Changed `SceneInstanceReady` to trigger an entity observer rather than be written to an event queue. - Changed `SceneInstanceReady` to carry the `InstanceId` of the scene. ## Migration Guide If you have a system which read `SceneInstanceReady` events: > ```fn ready_system(ready_events: EventReader<'_, '_, SceneInstanceReady>) {``` It must be rewritten as an observer: > ```commands.observe(|trigger: Trigger<SceneInstanceReady>| {``` Or, if you were expecting the event in relation to a specific entity or entities, as an entity observer: > ```commands.entity(entity).observe(|trigger: Trigger<SceneInstanceReady>| {``` |
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Bevy Scene
