moving code around

Next I might make each part of the editor a plugin

I know code moving is toil, but I'm kinda braindead and this is on my
todo list...

src/editor/animation.rs

@@ -0,0 +1,155 @@
+use crate::editor::prelude::*;
+
+#[derive(Debug, Component, Default)]
+pub struct AnimationWidget;
+
+#[derive(Debug, Component)]
+pub struct AnimationPlayAll;
+
+pub fn init_animations_ui(events: Query<Entity, Added<AnimationWidget>>, mut commands: Commands) {
+    events.iter().for_each(|entity| {
+        commands.entity(entity).with_children(|parent| {
+            parent.spawn((
+                AnimationPlayAll,
+                ButtonBundle {
+                    style: Style {
+                        border: UiRect::all(Val::Px(1.0)),
+                        margin: UiRect::all(Val::Px(1.0)),
+                        padding: UiRect::all(Val::Px(1.0)),
+                        ..default()
+                    },
+                    border_color: Color::BLACK.into(),
+                    ..default()
+                },
+                ui::Title {
+                    text: "Play All".into(),
+                    ..default()
+                },
+            ));
+        });
+    })
+}
+
+/// When a new scene is loaded, add any newly compatible animations
+/// TODO: Add target entity(s) too
+pub fn add_animations_ui(
+    player_spawned: Query<&Name, Added<AnimationPlayer>>,
+    widget: Query<Entity, With<AnimationWidget>>,
+    mut commands: Commands,
+    gltfs: Res<Assets<Gltf>>,
+    clips: Res<Assets<AnimationClip>>,
+) {
+    player_spawned.iter().for_each(|player_name| {
+        gltfs
+            .iter()
+            .flat_map(|(_, gltf)| gltf.named_animations.iter())
+            .filter_map(|(clip_name, handle)| {
+                clips.get(&handle).map(|clip| (clip_name, handle, clip))
+            })
+            .filter(|(_, _, clip)| clip.compatible_with(player_name))
+            .for_each(|(clip_name, handle, _)| {
+                create_asset_button(
+                    &widget,
+                    &mut commands,
+                    ui::TargetAsset {
+                        handle: handle.clone(),
+                    },
+                    clip_name.clone(),
+                    None,
+                );
+            });
+    });
+}
+
+// When a scene is de-selected, remove any outdated animation options
+pub fn remove_animations_ui(
+    mut removed_players: RemovedComponents<Handle<Scene>>,
+    current: Query<(Entity, &ui::TargetAsset<AnimationClip>)>,
+    clips: Res<Assets<AnimationClip>>,
+    targets: Query<(&AnimationPlayer, &Name)>,
+    mut commands: Commands,
+) {
+    // For each removed scene
+    removed_players.iter().for_each(|_| {
+        // Iterate over the current animation buttons
+        current
+            .iter()
+            .filter(|(_, ui::TargetAsset { handle })| {
+                // Check if this clip is compatible with any remaining entities
+                // NOTE: We are checking this is *not* compatible with any entities
+                clips
+                    .get(handle)
+                    .map(|clip| !(targets.iter().any(|(_, name)| clip.compatible_with(name))))
+                    .unwrap_or(true)
+            })
+            .for_each(|(_, ui::TargetAsset { handle })| {
+                // Destroy the buton if it is so
+                destroy_asset_button(
+                    &current,
+                    &mut commands,
+                    &ui::TargetAsset {
+                        handle: handle.clone(),
+                    },
+                );
+            });
+    });
+}
+
+pub fn play_all_animations(
+    start: Query<Entity, (With<Button>, Added<ui::Active>)>,
+    mut stop: RemovedComponents<ui::Active>,
+    play_all_btn: Query<Entity, With<AnimationPlayAll>>,
+    clip_btns: Query<Entity, With<ui::TargetAsset<AnimationClip>>>,
+    mut commands: Commands,
+) {
+    stop.iter()
+        .filter(|&entity| play_all_btn.contains(entity))
+        .for_each(|_| {
+            clip_btns.iter().for_each(|entity| {
+                commands.entity(entity).remove::<ui::Active>();
+            })
+        });
+    start
+        .iter()
+        .filter(|&entity| play_all_btn.contains(entity))
+        .for_each(|_| {
+            clip_btns.iter().for_each(|entity| {
+                commands.entity(entity).insert(ui::Active);
+            })
+        });
+}
+
+pub fn play_animation(
+    start: Query<Entity, (With<Button>, Added<ui::Active>)>,
+    mut stop: RemovedComponents<ui::Active>,
+    clip_refs: Query<&ui::TargetAsset<AnimationClip>>,
+    mut targets: Query<(&mut AnimationPlayer, &Name), With<Transform>>,
+    clips: Res<Assets<AnimationClip>>,
+) {
+    stop.iter().for_each(|entity| {
+        if let Ok(ui::TargetAsset { handle }) = clip_refs.get(entity) {
+            let clip = clips.get(&handle).expect("Load animation clip");
+            targets
+                .iter_mut()
+                .filter(|(_, name)| clip.compatible_with(name))
+                .for_each(|(mut player, _)| {
+                    player.pause();
+                })
+        }
+    });
+    start.iter().for_each(|entity| {
+        if let Ok(ui::TargetAsset { handle }) = clip_refs.get(entity) {
+            let clip = clips.get(&handle).expect("Load animation clip");
+            targets
+                .iter_mut()
+                .filter(|(_, name)| clip.compatible_with(name))
+                .for_each(|(mut player, _)| {
+                    if player.is_paused() {
+                        player.resume();
+                    } else {
+                        player.play(handle.clone()).repeat();
+                    }
+                })
+        }
+    });
+}

src/editor/asset_sync.rs

@@ -0,0 +1,55 @@
+use crate::editor::prelude::*;
+
+// This sets buttons to active when their associated handle is spawned
+pub fn sync_asset_buttons<T: Asset>(
+    events: Query<&Handle<T>, Added<Handle<T>>>,
+    buttons: Query<(Entity, &ui::TargetAsset<T>)>,
+    mut commands: Commands,
+) {
+    events.iter().for_each(|this_handle| {
+        info!("Syncing {:?}", this_handle);
+        buttons
+            .iter()
+            .find_map(|(entity, ui::TargetAsset { handle })| {
+                if handle == this_handle {
+                    Some(entity)
+                } else {
+                    None
+                }
+            })
+            .iter()
+            .for_each(|&entity| {
+                commands.entity(entity).insert(ui::Active);
+            });
+    });
+}
+
+// Remove active when handle is despawned?
+// ONLY IF there are no instances of that handle [!any(*)]
+pub fn sync_remove_asset_buttons<T: Asset>(
+    mut events: RemovedComponents<Handle<T>>,
+    asset_entities: Query<&Handle<T>>,
+    buttons: Query<(Entity, &ui::TargetAsset<T>)>,
+    mut commands: Commands,
+) {
+    events
+        .iter()
+        .find_map(|this_asset_entity| asset_entities.get(this_asset_entity).ok())
+        .iter()
+        .for_each(|this_handle| {
+            info!("Syncing removal of {:?}", this_handle);
+            buttons
+                .iter()
+                .find_map(|(entity, ui::TargetAsset { handle })| {
+                    if handle == *this_handle {
+                        Some(entity)
+                    } else {
+                        None
+                    }
+                })
+                .iter()
+                .for_each(|&entity| {
+                    commands.entity(entity).remove::<ui::Active>();
+                });
+        });
+}

src/editor/assets.rs

@@ -1,5 +1,4 @@
-use crate::ui;
-use bevy::{asset::Asset, prelude::*};
+use crate::editor::prelude::*;
 
 #[derive(Resource, Default)]
 pub struct AssetRegistry(pub Vec<HandleUntyped>);

src/editor/audio.rs

@@ -1,5 +1,5 @@
-use crate::{editor::assets::*, ui};
-use bevy::{audio::PlaybackMode, prelude::*};
+use crate::editor::prelude::*;
+use bevy::audio::PlaybackMode;
 
 #[derive(Debug, Component, Reflect, Default)]
 #[reflect(Component)]

src/editor/camera.rs

@@ -0,0 +1,66 @@
+use crate::editor::prelude::*;
+
+#[derive(Debug, Component)]
+pub struct EditorCamera;
+
+#[derive(Debug, Component, Default)]
+pub struct CameraWidget;
+
+pub fn cameras_ui(
+    mut added: Query<(Entity, &mut Camera, &Name), Added<Camera>>,
+    mut removed: RemovedComponents<Camera>,
+    editor_camera: Query<Entity, With<EditorCamera>>,
+    widget: Query<Entity, With<CameraWidget>>,
+    current: Query<(Entity, &ui::TargetEntity)>,
+    mut commands: Commands,
+) {
+    removed.iter().for_each(|entity| {
+        info!("Destroy button for {:?}", entity);
+        destroy_entity_button(&current, &mut commands, &ui::TargetEntity { entity });
+    });
+    added.iter_mut().for_each(|(entity, mut camera, name)| {
+        info!("Camera added {:?} {:?}", entity, name);
+        create_entity_button(
+            &widget,
+            &mut commands,
+            ui::TargetEntity { entity },
+            name.as_str().into(),
+        );
+        camera.is_active = entity == editor_camera.single();
+    });
+}
+
+/// Set the camera active component based on button clicks
+pub fn manage_active_camera(
+    events: Query<&ui::TargetEntity, Added<ui::Active>>,
+    mut cameras: Query<(Entity, &mut Camera)>,
+) {
+    events.iter().for_each(|ui::TargetEntity { entity }| {
+        cameras.iter_mut().for_each(|(this_entity, mut camera)| {
+            if this_entity == *entity {
+                info!("Marking {:?} as active camera", entity);
+                camera.is_active = true;
+            } else {
+                info!("Marking {:?} as inactive camera", entity);
+                camera.is_active = false;
+            }
+        });
+    });
+}
+
+// In the event that an active camera is despawned, fall back to the editor camera
+pub fn fallback_camera(
+    modified: Query<Entity, (Changed<Camera>, Without<EditorCamera>)>,
+    mut removed: RemovedComponents<Camera>,
+    other_cameras: Query<&Camera, Without<EditorCamera>>,
+    mut editor_camera: Query<&mut Camera, With<EditorCamera>>,
+) {
+    // Any time a camera is modified
+    modified.iter().chain(removed.iter()).for_each(|_| {
+        // If no other cameras are active
+        if !other_cameras.iter().any(|camera| camera.is_active) {
+            // Make the editor camera active
+            editor_camera.single_mut().is_active = true;
+        }
+    })
+}

src/editor/font.rs

@@ -1,5 +1,4 @@
-use crate::{editor::assets::*, ui};
-use bevy::prelude::*;
+use crate::editor::prelude::*;
 
 #[derive(Debug, Component, Default)]
 pub struct FontWidget;

src/editor/gltf.rs

@@ -0,0 +1,68 @@
+use crate::editor::prelude::*;
+
+#[derive(Debug, Component, Default)]
+pub struct GltfWidget;
+
+pub fn gltf_ui(
+    mut events: EventReader<AssetEvent<Gltf>>,
+    mut commands: Commands,
+    widget: Query<Entity, With<GltfWidget>>,
+    current: Query<(Entity, &ui::TargetAsset<Gltf>)>,
+    server: Res<AssetServer>,
+) {
+    events.iter().for_each(|event| match event {
+        AssetEvent::Created { handle } => {
+            info!("Asset created! {:?}", event);
+            create_asset_button(
+                &widget,
+                &mut commands,
+                ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+                get_asset_name(&server, handle.clone()),
+                None,
+            );
+        }
+        AssetEvent::Removed { handle } => {
+            info!("Asset removed! {:?}", event);
+            destroy_asset_button(
+                &current,
+                &mut commands,
+                &ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+            );
+        }
+        AssetEvent::Modified { handle } => {
+            info!("Asset modified! {:?}", event);
+            destroy_asset_button(
+                &current,
+                &mut commands,
+                &ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+            );
+            create_asset_button(
+                &widget,
+                &mut commands,
+                ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+                get_asset_name(&server, handle.clone()),
+                None,
+            );
+        }
+    });
+}
+
+pub fn control_active_gltf(
+    events: Query<Entity, (With<ui::TargetAsset<Gltf>>, Added<ui::Active>)>,
+    root: Query<Entity, With<LevelRoot>>,
+    mut commands: Commands,
+) {
+    events.iter().for_each(|_| {
+        root.iter().for_each(|entity| {
+            commands.entity(entity).despawn_descendants();
+        });
+    });
+}

src/editor/level.rs

@@ -0,0 +1,167 @@
+use crate::editor::prelude::*;
+use bevy::tasks::IoTaskPool;
+
+#[derive(Debug, Component, Reflect, Default)]
+#[reflect(Component)]
+pub struct LevelRoot;
+
+pub type Level = DynamicScene;
+
+#[derive(Debug, Component, Default)]
+pub struct LevelWidget;
+
+#[derive(Debug, Component)]
+pub struct ExportLevel;
+
+pub fn level_ui(
+    mut events: EventReader<AssetEvent<Level>>,
+    mut commands: Commands,
+    widget: Query<Entity, With<LevelWidget>>,
+    current: Query<(Entity, &ui::TargetAsset<Level>)>,
+    server: Res<AssetServer>,
+) {
+    events.iter().for_each(|event| match event {
+        AssetEvent::Created { handle } => {
+            info!("Asset created! {:?}", event);
+            create_asset_button(
+                &widget,
+                &mut commands,
+                ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+                get_asset_name(&server, handle.clone()),
+                None,
+            );
+        }
+        AssetEvent::Removed { handle } => {
+            info!("Asset removed! {:?}", event);
+            destroy_asset_button(
+                &current,
+                &mut commands,
+                &ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+            );
+        }
+        AssetEvent::Modified { handle } => {
+            info!("Asset modified! {:?}", event);
+            destroy_asset_button(
+                &current,
+                &mut commands,
+                &ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+            );
+            create_asset_button(
+                &widget,
+                &mut commands,
+                ui::TargetAsset {
+                    handle: handle.clone(),
+                },
+                get_asset_name(&server, handle.clone()),
+                None,
+            );
+        }
+    });
+}
+
+pub fn load_level(
+    events: Query<
+        &ui::TargetAsset<DynamicScene>,
+        (Added<ui::Active>, With<ui::TargetAsset<DynamicScene>>),
+    >,
+    root: Query<Entity, With<LevelRoot>>,
+    mut commands: Commands,
+) {
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        root.iter().for_each(|entity| {
+            commands.entity(entity).despawn_recursive();
+        });
+        commands.spawn(DynamicSceneBundle {
+            scene: handle.clone(),
+            ..default()
+        });
+    });
+}
+
+pub fn export_level(
+    level_root: Query<Entity, With<LevelRoot>>,
+    audio_root: Query<Entity, With<AudioRoot>>,
+    children: Query<&Children>,
+    world: &World,
+) {
+    let app_type_registry = world.resource::<AppTypeRegistry>().clone();
+    let mut builder = DynamicSceneBuilder::from_world(world.clone());
+
+    builder.deny_all_resources();
+
+    // Exclude computed visibility
+    builder.deny_all();
+
+    // Level administrivia
+    builder.allow::<LevelRoot>();
+    builder.allow::<AudioRoot>();
+
+    // TODO: Serialize Timeline
+
+    // Scene components
+    builder.allow::<Handle<Scene>>();
+
+    // Spatial components
+    builder.allow::<Transform>();
+    builder.allow::<GlobalTransform>();
+    builder.allow::<Visibility>();
+
+    // Audio components
+    builder.allow::<Handle<AudioSource>>();
+    builder.allow::<PlaybackSettings>();
+
+    // Text components
+    builder.allow::<Handle<Font>>();
+    builder.allow::<Handle<Monologue>>();
+
+    level_root.iter().for_each(|level| {
+        // Extract the level root
+        builder.extract_entity(level);
+
+        if let Ok(kids) = children.get(level) {
+            builder.extract_entities(kids.into_iter().map(|&e| e));
+        } else {
+            warn!("Level is empty!");
+        }
+    });
+
+    audio_root.iter().for_each(|audio| {
+        // Extract the level root
+        builder.extract_entity(audio);
+
+        if let Ok(kids) = children.get(audio) {
+            builder.extract_entities(kids.into_iter().map(|&e| e));
+        } else {
+            warn!("Audio is empty!");
+        }
+    });
+
+    let scene = builder.build();
+
+    let serialized = scene
+        .serialize_ron(&app_type_registry)
+        .expect("Serialize scene");
+
+    IoTaskPool::get()
+        .spawn(async move {
+            // Write the scene RON data to file
+            std::fs::write(format!("assets/output.scn.ron"), serialized.as_bytes())
+                .expect("Error while writing scene to file");
+        })
+        .detach();
+}
+
+pub fn rehydrate_level<W: Component, WO: Component + Default>(
+    events: Query<Entity, (Added<W>, Without<WO>)>,
+    mut commands: Commands,
+) {
+    events.iter().for_each(|entity| {
+        commands.entity(entity).insert(WO::default());
+    });
+}

src/editor/lighting.rs

@@ -0,0 +1,21 @@
+use crate::editor::prelude::*;
+
+pub fn spot_light_force_shadows(mut spot_lights: Query<&mut SpotLight, Added<SpotLight>>) {
+    spot_lights.iter_mut().for_each(|mut light| {
+        light.shadows_enabled = true;
+    })
+}
+
+pub fn directional_light_force_shadows(
+    mut directional_lights: Query<&mut DirectionalLight, Added<DirectionalLight>>,
+) {
+    directional_lights.iter_mut().for_each(|mut light| {
+        light.shadows_enabled = true;
+    })
+}
+
+pub fn point_light_force_shadows(mut point_lights: Query<&mut PointLight, Added<PointLight>>) {
+    point_lights.iter_mut().for_each(|mut light| {
+        light.shadows_enabled = true;
+    })
+}

src/editor/mod.rs

@@ -1,10 +1,18 @@
-pub mod audio;
-
+pub mod animation;
+pub mod asset_sync;
 pub mod assets;
-
-pub mod monologue;
-
+pub mod audio;
+pub mod camera;
 pub mod font;
+pub mod gltf;
+pub mod level;
+pub mod lighting;
+pub mod monologue;
+mod prelude;
+pub mod quit;
+pub mod reset;
+pub mod scene;
+pub mod timeline;
 
 use crate::ui;
 use bevy::{asset::Asset, prelude::*};

src/editor/monologue.rs

@@ -1,10 +1,6 @@
-use crate::{
-    editor::{assets::*, font::*},
-    ui,
-};
+use crate::editor::prelude::*;
 use bevy::{
     asset::{AssetLoader, LoadContext, LoadedAsset},
-    prelude::*,
     reflect::{TypePath, TypeUuid},
     ui::FocusPolicy,
     utils::BoxedFuture,

src/editor/prelude.rs

@@ -0,0 +1,8 @@
+pub use crate::{
+    editor::{
+        animation::*, asset_sync::*, assets::*, audio::*, camera::*, font::*, gltf::*, level::*,
+        lighting::*, monologue::*, quit::*, reset::*, scene::*, timeline::*, *,
+    },
+    ui,
+};
+pub use bevy::{gltf::Gltf, prelude::*};

src/editor/quit.rs

@@ -0,0 +1,10 @@
+use crate::editor::prelude::*;
+
+use bevy::app::AppExit;
+
+#[derive(Debug, Component, Default)]
+pub struct QuitAction;
+
+pub fn quit(mut exit: EventWriter<AppExit>) {
+    exit.send(AppExit);
+}

src/editor/reset.rs

@@ -0,0 +1,69 @@
+use crate::editor::prelude::*;
+
+#[derive(Debug, Component)]
+pub struct ClearLevel;
+
+pub fn clear_level(
+    events: Query<Entity, (With<ClearLevel>, Added<ui::Active>)>,
+    actives: Query<
+        Entity,
+        (
+            With<ui::Active>,
+            Or<(
+                With<ui::TargetEntity>,
+                With<ui::TargetAsset<Gltf>>,
+                With<ui::TargetAsset<Scene>>,
+                With<ui::TargetAsset<AnimationClip>>,
+                With<ui::TargetAsset<AudioSource>>,
+                With<ui::TargetAsset<Monologue>>,
+                With<ui::TargetAsset<Font>>,
+            )>,
+        ),
+    >,
+    root: Query<Entity, With<LevelRoot>>,
+    mut commands: Commands,
+) {
+    events.iter().for_each(|_| {
+        actives.iter().for_each(|entity| {
+            commands.entity(entity).remove::<ui::Active>();
+        });
+        root.iter().for_each(|entity| {
+            commands.entity(entity).despawn_descendants();
+        });
+    })
+}
+
+#[derive(Debug, Component)]
+pub struct ClearAssets;
+
+pub fn clear_assets(
+    asset_holders: Query<
+        Entity,
+        Or<(
+            With<ui::TargetAsset<Gltf>>,
+            With<Handle<Gltf>>,
+            With<ui::TargetAsset<Scene>>,
+            With<Handle<Scene>>,
+            With<ui::TargetAsset<AnimationClip>>,
+            With<Handle<AnimationClip>>,
+            With<ui::TargetAsset<AudioSource>>,
+            With<Handle<AudioSource>>,
+            With<ui::TargetAsset<Monologue>>,
+            With<Handle<Monologue>>,
+            With<ui::TargetAsset<Font>>,
+            With<Handle<Font>>,
+        )>,
+    >,
+    mut registry: ResMut<AssetRegistry>,
+    mut commands: Commands,
+) {
+    info!("Clearing assets");
+
+    // Clear buttons holding asset references
+    asset_holders
+        .iter()
+        .for_each(|entity| commands.entity(entity).despawn_recursive());
+
+    // Empty asset registry
+    registry.0.clear();
+}

src/editor/scene.rs

@@ -0,0 +1,93 @@
+use crate::editor::prelude::*;
+
+#[derive(Debug, Component, Default)]
+pub struct SceneWidget;
+
+pub fn add_scenes_ui(
+    gltf_selected: Query<&ui::TargetAsset<Gltf>, Added<ui::Active>>,
+    mut commands: Commands,
+    gltfs: Res<Assets<Gltf>>,
+    widget: Query<Entity, With<SceneWidget>>,
+) {
+    gltf_selected.iter().for_each(|ui::TargetAsset { handle }| {
+        if let Some(gltf) = gltfs.get(&handle.clone()) {
+            gltf.named_scenes.iter().for_each(|(name, handle)| {
+                create_asset_button(
+                    &widget,
+                    &mut commands,
+                    ui::TargetAsset {
+                        handle: handle.clone(),
+                    },
+                    name.clone(),
+                    None,
+                );
+            })
+        }
+    });
+}
+
+pub fn remove_scenes_ui(
+    mut gltf_unselected: RemovedComponents<ui::Active>,
+    target_assets: Query<&ui::TargetAsset<Gltf>>,
+    current: Query<(Entity, &ui::TargetAsset<Scene>)>,
+    gltfs: Res<Assets<Gltf>>,
+    mut commands: Commands,
+) {
+    gltf_unselected
+        .iter()
+        .filter_map(|entity| target_assets.get(entity).ok())
+        .filter_map(|ui::TargetAsset { handle }| gltfs.get(handle))
+        .for_each(|gltf| {
+            gltf.scenes.iter().for_each(|handle| {
+                destroy_asset_button(
+                    &current,
+                    &mut commands,
+                    &ui::TargetAsset {
+                        handle: handle.clone(),
+                    },
+                );
+            });
+        });
+}
+
+pub fn control_active_scenes(
+    added: Query<Entity, (With<Button>, Added<ui::Active>)>,
+    mut removed: RemovedComponents<ui::Active>,
+    scene_refs: Query<&ui::TargetAsset<Scene>>,
+    scenes: Query<(Entity, &Handle<Scene>)>,
+    level_root: Query<Entity, With<LevelRoot>>,
+    mut commands: Commands,
+) {
+    // A scene button was marked inactive
+    removed.iter().for_each(|entity| {
+        // Get the handle associated with that button
+        scene_refs
+            .get(entity)
+            .iter()
+            .for_each(|ui::TargetAsset { handle }| {
+                scenes
+                    .iter()
+                    .find_map(|(entity, this_handle)| (this_handle == handle).then_some(entity))
+                    .iter()
+                    .for_each(|&entity| {
+                        commands.entity(entity).despawn_recursive();
+                    });
+            });
+    });
+    added.iter().for_each(|entity| {
+        scene_refs
+            .get(entity)
+            .iter()
+            .for_each(|ui::TargetAsset { handle }| {
+                info!("Spawning Scene {:?}", handle);
+                commands
+                    .entity(level_root.single())
+                    .with_children(|parent| {
+                        parent.spawn(SceneBundle {
+                            scene: handle.clone(),
+                            ..default()
+                        });
+                    });
+            });
+    });
+}

src/editor/timeline.rs

@@ -0,0 +1,325 @@
+use crate::editor::prelude::*;
+
+/// Timeline widget marker
+#[derive(Debug, Component)]
+pub struct TimelineWidget;
+
+/// Add Epoch component, used on a button to trigger a new epoch addition
+#[derive(Debug, Component)]
+pub struct AddEpoch;
+
+/// Epoch ID Component
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochId {
+    id: usize,
+}
+
+/// Epoch GLTF Component
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochGltf {
+    gltf: Handle<Gltf>,
+}
+
+/// Epoch Scene Component
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochScene {
+    scene: Handle<Scene>,
+}
+
+/// Epoch Camera Component, marking the current camera
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochCamera {
+    camera: Entity,
+}
+
+/// Epoch music component, marking the opening track for this epoch
+#[derive(Debug, Reflect, Default, Component, Clone)]
+pub struct EpochMusic {
+    music: Handle<AudioSource>,
+}
+
+/// Epoch monologue, marking the dialog spoken this epoch
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochMonologue {
+    monologue: Handle<Monologue>,
+}
+
+/// Epoch font, marking the font used for this epoch's monologue
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochFont {
+    font: Handle<Font>,
+}
+
+/// A vector of audios looping this epoch as background tracks
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochSfx {
+    sfx: Vec<Handle<AudioSource>>,
+}
+
+/// Epoch animations, looping this epoch
+#[derive(Debug, Reflect, Component, Clone)]
+pub struct EpochAnimations {
+    animations: Vec<Handle<AnimationClip>>,
+}
+
+/// System for adding an epoch to the level's timeline
+/// Triggered when a button with the AddEpoch marker is Active
+pub fn add_timeline_epoch(
+    root: Query<(Entity, &Children), With<TimelineWidget>>,
+    mut commands: Commands,
+) {
+    info!("Adding timeline epoch");
+
+    root.iter().for_each(|(entity, children)| {
+        let id = children.iter().len();
+        let name = format!("{}", id);
+        commands.entity(entity).with_children(|parent| {
+            parent.spawn((
+                ButtonBundle {
+                    style: Style {
+                        border: UiRect::all(Val::Px(1.0)),
+                        margin: UiRect::all(Val::Px(1.0)),
+                        padding: UiRect::all(Val::Px(1.0)),
+                        ..default()
+                    },
+                    border_color: Color::BLACK.into(),
+                    ..default()
+                },
+                ui::Title {
+                    text: name,
+                    ..default()
+                },
+                EpochId { id },
+            ));
+        });
+    });
+}
+
+/// Set the GLTF for the current epoch
+pub fn set_epoch_gltf(
+    events: Query<&ui::TargetAsset<Gltf>, Added<ui::Active>>,
+    active_epoch: Query<Entity, (With<ui::Active>, With<EpochId>)>,
+    mut commands: Commands,
+) {
+    // Each time a GLTF is selected in the editor
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        // Iterate over all (0 or 1) active epochs
+        active_epoch.iter().for_each(|entity| {
+            // Set the GLTF (overwrite existing GLTF selections)
+            commands.entity(entity).insert(EpochGltf {
+                gltf: handle.clone(),
+            });
+
+            // TODO: Unset Scene, Camera, Animations
+        });
+    });
+}
+
+pub fn load_epoch_gltf(events: Query<Option<&EpochGltf>, (Added<ui::Active>, With<EpochId>)>) {
+    events.iter().for_each(|epoch_gltf| {
+        warn!("TODO: Load epoch GLTF!");
+    })
+}
+
+pub fn set_epoch_scene(
+    events: Query<&ui::TargetAsset<Scene>, Added<ui::Active>>,
+    active_epoch: Query<Entity, (With<ui::Active>, With<EpochId>)>,
+    mut commands: Commands,
+) {
+    // Each time a Scene is selected in the editor
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        // Iterate over all (0 or 1) active epochs
+        active_epoch.iter().for_each(|entity| {
+            // Set the Scene (overwrite existing Scene selections)
+            commands.entity(entity).insert(EpochScene {
+                scene: handle.clone(),
+            });
+        });
+    });
+}
+
+pub fn load_epoch_scene(events: Query<Option<&EpochScene>, (Added<ui::Active>, With<EpochId>)>) {
+    events.iter().for_each(|epoch_scene| {
+        warn!("TODO: Load epoch Scene!");
+    })
+}
+
+pub fn set_epoch_camera(
+    events: Query<&ui::TargetEntity, Added<ui::Active>>,
+    active_epoch: Query<Entity, (With<ui::Active>, With<EpochId>)>,
+    mut commands: Commands,
+) {
+    // Each time a Scene is selected in the editor
+    events.iter().for_each(|ui::TargetEntity { entity }| {
+        // Iterate over all (0 or 1) active epochs
+        active_epoch.iter().for_each(|this_entity| {
+            // Set the Scene (overwrite existing Scene selections)
+            commands
+                .entity(this_entity)
+                .insert(EpochCamera { camera: *entity });
+        });
+    });
+}
+
+pub fn load_epoch_camera(events: Query<Option<&EpochCamera>, (Added<ui::Active>, With<EpochId>)>) {
+    events.iter().for_each(|epoch_camera| {
+        warn!("TODO: Load epoch Camera");
+    })
+}
+
+pub fn set_epoch_music(
+    events: Query<&ui::TargetAsset<AudioSource>, Added<ui::Active>>,
+    active_epoch: Query<Entity, (With<ui::Active>, With<EpochId>)>,
+    mut commands: Commands,
+) {
+    // Each time a Scene is selected in the editor
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        info!("TODO: Select scene music");
+
+        // // Iterate over all (0 or 1) active epochs
+        // active_epoch.iter().for_each(|entity| {
+        //     // Set the Scene (overwrite existing Scene selections)
+        //     commands.entity(entity).insert(EpochMusic { music: handle.clone() });
+        // });
+    });
+}
+
+pub fn load_epoch_music(events: Query<Option<&EpochMusic>, (Added<ui::Active>, With<EpochId>)>) {
+    events.iter().for_each(|epoch_music| {
+        warn!("TODO: Load epoch music!");
+    })
+}
+
+pub fn set_epoch_monologue(
+    events: Query<&ui::TargetAsset<Monologue>, Added<ui::Active>>,
+    active_epoch: Query<Entity, (With<ui::Active>, With<EpochId>)>,
+    mut commands: Commands,
+) {
+    // Each time a Scene is selected in the editor
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        // Iterate over all (0 or 1) active epochs
+        active_epoch.iter().for_each(|entity| {
+            // Set the Scene (overwrite existing Scene selections)
+            commands.entity(entity).insert(EpochMonologue {
+                monologue: handle.clone(),
+            });
+        });
+    });
+}
+
+pub fn load_epoch_monologue(
+    events: Query<Option<&EpochMonologue>, (Added<ui::Active>, With<EpochId>)>,
+) {
+    events.iter().for_each(|epoch_monologue| {
+        warn!("TODO: unset epoch Monologue!");
+        epoch_monologue
+            .iter()
+            .for_each(|EpochMonologue { monologue }| {
+                warn!("TODO: Set level epoch");
+            });
+    });
+}
+
+pub fn set_epoch_font(
+    events: Query<&ui::TargetAsset<Font>, Added<ui::Active>>,
+    active_epoch: Query<Entity, (With<ui::Active>, With<EpochId>)>,
+    mut commands: Commands,
+) {
+    // Each time a Scene is selected in the editor
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        // Iterate over all (0 or 1) active epochs
+        active_epoch.iter().for_each(|entity| {
+            // Set the Scene (overwrite existing Scene selections)
+            commands.entity(entity).insert(EpochFont {
+                font: handle.clone(),
+            });
+        });
+    });
+}
+
+pub fn load_epoch_font(
+    events: Query<Option<&EpochFont>, (Added<ui::Active>, With<EpochId>)>,
+    mut font_info: ResMut<FontInfo>,
+) {
+    events.iter().for_each(|epoch_font| {
+        font_info.default = epoch_font.map(|EpochFont { font }| font.clone());
+    });
+}
+
+pub fn set_epoch_sfx(
+    events: Query<&ui::TargetAsset<AudioSource>, Added<ui::Active>>,
+    mut active_epoch: Query<(Entity, Option<&mut EpochSfx>), (With<ui::Active>, With<EpochId>)>,
+    mut commands: Commands,
+) {
+    // Each time a Scene is selected in the editor
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        // Iterate over all (0 or 1) active epochs
+        active_epoch.iter_mut().for_each(|(entity, maybe_sfx)| {
+            info!("Adding sfx {:?} to epoch {:?}", maybe_sfx, entity);
+            if let Some(mut epoch_sfx) = maybe_sfx {
+                epoch_sfx.sfx.push(handle.clone());
+            } else {
+                // Set the Scene (overwrite existing Scene selections)
+                commands.entity(entity).insert(EpochSfx {
+                    sfx: vec![handle.clone()],
+                });
+            }
+        });
+    });
+}
+
+pub fn load_epoch_sfx(
+    added: Query<Entity, (Added<ui::Active>, With<EpochId>)>,
+    mut removed: RemovedComponents<ui::Active>,
+    epoch_sfx: Query<&EpochSfx>,
+    mut writer: EventWriter<ControlAudio>,
+) {
+    removed.iter().for_each(|entity| {
+        epoch_sfx.get(entity).iter().for_each(|EpochSfx { sfx }| {
+            sfx.iter().for_each(|handle| {
+                writer.send(ControlAudio::Stop(handle.clone()));
+            });
+        });
+    });
+    added.iter().for_each(|entity| {
+        epoch_sfx.get(entity).iter().for_each(|EpochSfx { sfx }| {
+            sfx.iter().for_each(|handle| {
+                writer.send(ControlAudio::Loop(handle.clone()));
+            });
+        });
+    });
+}
+
+pub fn set_epoch_animations(
+    events: Query<&ui::TargetAsset<AnimationClip>, Added<ui::Active>>,
+    mut active_epoch: Query<
+        (Entity, Option<&mut EpochAnimations>),
+        (With<ui::Active>, With<EpochId>),
+    >,
+    mut commands: Commands,
+) {
+    // Each time a Scene is selected in the editor
+    events.iter().for_each(|ui::TargetAsset { handle }| {
+        // Iterate over all (0 or 1) active epochs
+        active_epoch
+            .iter_mut()
+            .for_each(|(entity, maybe_animations)| {
+                if let Some(mut epoch_animations) = maybe_animations {
+                    epoch_animations.animations.push(handle.clone());
+                } else {
+                    // Set the Scene (overwrite existing Scene selections)
+                    commands.entity(entity).insert(EpochAnimations {
+                        animations: vec![handle.clone()],
+                    });
+                }
+            });
+    });
+}
+
+pub fn load_epoch_animations(
+    events: Query<Option<&EpochAnimations>, (Added<ui::Active>, With<EpochId>)>,
+) {
+    events.iter().for_each(|epoch_animations| {
+        warn!("TODO: Load epoch Animations!");
+    })
+}