rust-bevy-standards

⚠️ Bevy 0.17+ Breaking Changes

• Material handles wrapped in MeshMaterial3d<T>, not Handle<T>

• Observer pattern replaces event system (commands.trigger(), add_observer())

• Event split into Message (buffered) and Event (observers)

• EventWriter/EventReader replaced by MessageWriter/MessageReader (message.write() / messages.read())

• Observer trigger API changed:

  // Old
  commands.add_observer(|trigger: Trigger<OnAdd, Player>| {
      info!("Spawned player {}", trigger.target());
  });
  
  // New
  commands.add_observer(|add: On<Add, Player>| {
      info!("Spawned player {}", add.entity);
  });
  

• Color arithmetic removed; use component extraction instead

⚠️ Bevy 0.18+ Breaking Changes

• RenderTarget is now a required component on Camera, not a Camera field:

  // Old
  Camera { target: RenderTarget::Image(handle.into()), ..default() }
  // New
  commands.spawn((Camera3d::default(), RenderTarget::Image(handle.into())));
  

• BorderRadius is now a field on Node, not a component
• LineHeight is now a required component on Text/Text2d/TextSpan; removed from TextFont
• AmbientLight resource renamed to GlobalAmbientLight; AmbientLight is now a component on Camera
• clear_children → detach_all_children, remove_children → detach_children, remove_child → detach_child (same on EntityCommands and EntityWorldMut)
• AnimationTarget { id, player } replaced by separate AnimationTargetId(id) and AnimatedBy(player_entity) components
• next_state.set(...) now always fires OnEnter/OnExit; use set_if_neq for the old behaviour
• MaterialPlugin fields prepass_enabled/shadows_enabled replaced by Material trait methods enable_prepass()/enable_shadows()
• SimpleExecutor removed; use SingleThreadedExecutor instead
• #[reflect(...)] now only supports parentheses, not braces or brackets
• AssetLoader, AssetSaver, AssetTransformer, Process now require #[derive(TypePath)]
• ron no longer re-exported from bevy_scene or bevy_asset; add it as a direct dependency
• Feature renames: animation → gltf_animation, bevy_sprite_picking_backend → sprite_picking, bevy_ui_picking_backend → ui_picking, bevy_mesh_picking_backend → mesh_picking

General

• Never delete target binaries — Bevy rebuilds take minutes