particles: fade out transparency over time

CHANGELOG.md

@@ -1,3 +1,7 @@
+# v0.11.1
+
+- Fixed radio stations
+
 # v0.11.0
 
 - Upgrade to Bevy 0.14.2, Rust 1.81

doc/gamedesign.md

@@ -46,6 +46,8 @@ We are not quite there yet, but this is what I'm aiming for:
     - No anxiety-causing features
     - No DRM
     - No paid features
+    - All source code and assets are ["free" as defined by the FSF](https://www.gnu.org/licenses/license-list.html)
+    - Obviously, space as a whole is not exactly wholesome. Space is a death trap. This should still be felt by the player, it's a space simulation after all.
 - Non-addictiveness
     - No features that manipulate the player into neglecting their life responsibilities in favor of the game
     - No artificially long game progression

src/actor.rs

@@ -599,8 +599,9 @@ fn handle_wants_maxvelocity(
 }
 
 fn handle_wants_lookat(
-    mut query: Query<(&Position, &mut Rotation, &Transform, &WantsToLookAt)>,
+    mut query: Query<(&Position, &mut Rotation, &Transform, &WantsToLookAt), Without<Camera>>,
     q_playercam: Query<&Position, With<PlayerCamera>>,
+    q_cam: Query<&Transform, With<Camera>>,
     id2pos: Res<game::Id2Pos>,
 ) {
     let player_pos = if let Ok(player_pos) = q_playercam.get_single() {
@@ -608,17 +609,22 @@ fn handle_wants_lookat(
     } else {
         return;
     };
+    let cam_pos = if let Ok(cam_trans) = q_cam.get_single() {
+        cam_trans.translation.as_dvec3() + player_pos.0
+    } else {
+        return;
+    };
 
     // TODO: use ExternalTorque rather than hard-resetting the rotation
     for (pos, mut rot, trans, target_id) in &mut query {
-        let target_pos = if target_id.0 == cmd::ID_SPECIAL_PLAYERCAM {
-            player_pos
+        let target_pos: DVec3 = if target_id.0 == cmd::ID_SPECIAL_PLAYERCAM {
+            cam_pos
         } else if let Some(target_pos) = id2pos.0.get(&target_id.0) {
-            target_pos
+            *target_pos
         } else {
             continue;
         };
-        rot.0 = look_at_quat(**pos, *target_pos, trans.up().as_dvec3());
+        rot.0 = look_at_quat(**pos, target_pos, trans.up().as_dvec3());
     }
 }
 

src/camera.rs

@@ -430,6 +430,7 @@ pub fn apply_input_to_player(
         (&Position, &LinearVelocity),
         (
             Without<hud::IsTargeted>,
+            Without<visual::IsEffect>,
             Without<actor::PlayerCamera>,
             Without<actor::Player>,
             Without<actor::PlayerDrivesThis>,
@@ -447,6 +448,7 @@ pub fn apply_input_to_player(
         ),
         (With<actor::PlayerCamera>, Without<Camera>),
     >,
+    mut ew_effect: EventWriter<visual::SpawnEffectEvent>,
 ) {
     if settings.map_active || !settings.in_control() {
         return;
@@ -564,6 +566,16 @@ pub fn apply_input_to_player(
             engine.current_warmup =
                 (engine.current_warmup + dt / engine.warmup_seconds).clamp(0.0, 1.0);
             play_thruster_sound = true;
+
+            // Visual effect
+            if acceleration_total.length_squared() > 1e-4 {
+                let thruster_direction = acceleration_total.normalize();
+                let thruster_v = v.0 - 10.0 * thruster_direction;
+                ew_effect.send(visual::SpawnEffectEvent {
+                    duration: 2.0,
+                    class: visual::Effects::ThrusterParticle(pos.clone(), LinearVelocity::from(thruster_v)),
+                });
+            }
         } else {
             engine.current_warmup =
                 (engine.current_warmup - dt / engine.warmup_seconds).clamp(0.0, 1.0);

src/common.rs

@@ -110,6 +110,10 @@ pub fn in_shadow(
 
 pub fn look_at_quat(from: DVec3, to: DVec3, up: DVec3) -> DQuat {
     let direction = (to - from).normalize();
+    let direction_len = direction.length_squared();
+    if direction_len < 1e-4 || direction_len.is_nan() {
+        return DQuat::IDENTITY;
+    }
     let right = up.cross(direction).normalize();
     let corrected_up = direction.cross(right);
 

src/game.rs

@@ -12,7 +12,6 @@
 
 use crate::prelude::*;
 use bevy::color::palettes::css;
-use bevy::pbr::ExtendedMaterial;
 use bevy::prelude::*;
 use bevy::scene::SceneInstance;
 use bevy::window::{PrimaryWindow, Window, WindowMode};
@@ -471,22 +470,23 @@ fn update_id2v(mut id2v: ResMut<Id2V>, q_id: Query<(&LinearVelocity, &actor::Ide
 fn debug(
     settings: Res<var::Settings>,
     keyboard_input: Res<ButtonInput<KeyCode>>,
-    mut commands: Commands,
-    mut extended_materials: ResMut<
-        Assets<ExtendedMaterial<StandardMaterial, load::AsteroidSurface>>,
-    >,
+    // mut commands: Commands,
+    // mut extended_materials: ResMut<
+        // Assets<bevy::pbr::ExtendedMaterial<StandardMaterial, load::AsteroidSurface>>,
+    // >,
     mut achievement_tracker: ResMut<var::AchievementTracker>,
     vars: Res<var::GameVars>,
-    materials: Query<(Entity, Option<&Name>, &Handle<Mesh>)>,
+    // materials: Query<(Entity, Option<&Name>, &Handle<Mesh>)>,
 ) {
     if settings.dev_mode && keyboard_input.just_pressed(KeyCode::KeyP) {
-        for (entity, _name, mesh) in &materials {
-            dbg!(mesh);
-            let mut entity = commands.entity(entity);
-            entity.remove::<Handle<StandardMaterial>>();
-            let material = extended_materials.add(load::AsteroidSurface::material());
-            entity.insert(material);
-        }
+
+        // for (entity, _name, mesh) in &materials {
+            // dbg!(mesh);
+            // let mut entity = commands.entity(entity);
+            // entity.remove::<Handle<StandardMaterial>>();
+            // let material = extended_materials.add(load::AsteroidSurface::material());
+            // entity.insert(material);
+        // }
     }
     if settings.dev_mode && keyboard_input.just_pressed(KeyCode::KeyN) {
         achievement_tracker.achieve_all();

src/menu.rs

@@ -475,7 +475,7 @@ pub fn update_menu(
                         } else {
                             &settings.radio_modes[0]
                         };
-                    text.sections[i].value = format!("Radio: {station}\n");
+                    text.sections[i].value = format!("Speakers: {station}\n");
                 }
                 MenuAction::ToggleAR => {
                     let onoff = bool2string(settings.hud_active);

src/var.rs

@@ -177,6 +177,7 @@ impl Default for Settings {
             radio_modes: vec![
                 // see also: settings.is_radio_playing()
                 "Off".to_string(),
+                "Space Wave Radio".to_string(),
                 "Amplify outside recordings".to_string(),
             ],
             volume_sfx: 100,

src/visual.rs

@@ -12,6 +12,7 @@
 
 use crate::prelude::*;
 use bevy::prelude::*;
+use bevy_xpbd_3d::prelude::*;
 use std::time::Duration;
 
 pub struct VisualPlugin;
@@ -26,6 +27,8 @@ impl Plugin for VisualPlugin {
         app.add_systems(Update, spawn_effects);
         app.add_systems(Update, update_fadein);
         app.add_systems(Update, update_fadeout);
+        app.add_systems(Update, update_fade_material);
+        app.add_systems(Update, update_grow);
         app.add_systems(Update, play_animations);
         // Blackout disabled for now
         //app.add_systems(Update, update_blackout);
@@ -37,15 +40,32 @@ impl Plugin for VisualPlugin {
 pub enum Effects {
     FadeIn(Color),
     FadeOut(Color),
+    ThrusterParticle(Position, LinearVelocity),
 }
 
 // Blackout disabled for now
 //#[derive(Component)] pub struct BlackOutOverlay;
 
 #[derive(Component)]
-pub struct FadeIn;
+pub struct IsEffect;
 #[derive(Component)]
-pub struct FadeOut;
+pub struct FadeInSprite;
+#[derive(Component)]
+pub struct FadeOutSprite;
+#[derive(Component)]
+pub struct FadeMaterial {
+    pub start_time: f64,
+    pub duration: f64,
+    pub value_start: f32,
+    pub value_end: f32,
+}
+#[derive(Component)]
+pub struct Grow3DObject {
+    pub start_time: f64,
+    pub duration: f64,
+    pub scale_start: f32,
+    pub scale_end: f32,
+}
 #[derive(Component)]
 pub struct Effect {
     pub class: Effects,
@@ -109,6 +129,9 @@ pub fn setup(
 pub fn spawn_effects(
     mut commands: Commands,
     mut er_effect: EventReader<SpawnEffectEvent>,
+    mut materials: ResMut<Assets<StandardMaterial>>,
+    mut meshes: ResMut<Assets<Mesh>>,
+    asset_server: Res<AssetServer>,
     time: Res<Time>,
 ) {
     let now = time.elapsed_seconds_f64();
@@ -116,12 +139,13 @@ pub fn spawn_effects(
         match effect.class {
             Effects::FadeIn(color) => {
                 commands.spawn((
+                    IsEffect,
                     Effect {
                         class: effect.class.clone(),
                         duration: effect.duration,
                         start_time: now,
                     },
-                    FadeIn,
+                    FadeInSprite,
                     NodeBundle {
                         style: style_fullscreen(),
                         background_color: color.into(),
@@ -131,12 +155,13 @@ pub fn spawn_effects(
             }
             Effects::FadeOut(color) => {
                 commands.spawn((
+                    IsEffect,
                     Effect {
                         class: effect.class.clone(),
                         duration: effect.duration,
                         start_time: now,
                     },
-                    FadeOut,
+                    FadeOutSprite,
                     NodeBundle {
                         style: style_fullscreen(),
                         background_color: color.with_alpha(0.0).into(),
@@ -144,13 +169,49 @@ pub fn spawn_effects(
                     },
                 ));
             }
+            Effects::ThrusterParticle(pos, v) => {
+                let texture = asset_server.load("textures/exhaust.png");
+                commands.spawn((
+                    IsEffect,
+                    RigidBody::Kinematic,
+                    bevy::pbr::NotShadowCaster,
+                    pos,
+                    v,
+                    Grow3DObject {
+                        start_time: now,
+                        duration: effect.duration,
+                        scale_start: 1.0,
+                        scale_end: 20.0,
+                    },
+                    FadeMaterial {
+                        start_time: now,
+                        duration: effect.duration,
+                        value_start: 0.1,
+                        value_end: 0.0,
+                    },
+                    world::DespawnAt(now + effect.duration),
+                    world::DespawnOnPlayerDeath,
+                    actor::WantsToLookAt(cmd::ID_SPECIAL_PLAYERCAM.into()),
+                    PbrBundle {
+                        mesh: meshes.add(Mesh::from(Rectangle::new(0.2, 0.2))),
+                        material: materials.add(StandardMaterial {
+                            base_color_texture: Some(texture),
+                            perceptual_roughness: 1.0,
+                            metallic: 0.5,
+                            alpha_mode: AlphaMode::Blend,
+                            ..Default::default()
+                        }),
+                        ..default()
+                    },
+                ));
+            }
         }
     }
 }
 
 pub fn update_fadein(
     mut commands: Commands,
-    mut q_effect: Query<(Entity, &Effect, &mut BackgroundColor), With<FadeIn>>,
+    mut q_effect: Query<(Entity, &Effect, &mut BackgroundColor), With<FadeInSprite>>,
     time: Res<Time>,
 ) {
     for (entity, effect, mut bgcolor) in &mut q_effect {
@@ -166,7 +227,7 @@ pub fn update_fadein(
 
 pub fn update_fadeout(
     mut commands: Commands,
-    mut q_effect: Query<(Entity, &Effect, &mut BackgroundColor), With<FadeOut>>,
+    mut q_effect: Query<(Entity, &Effect, &mut BackgroundColor), With<FadeOutSprite>>,
     time: Res<Time>,
 ) {
     for (entity, effect, mut bgcolor) in &mut q_effect {
@@ -180,6 +241,54 @@ pub fn update_fadeout(
     }
 }
 
+pub fn update_fade_material(
+    mut commands: Commands,
+    mut q_object: Query<(Entity, &Handle<StandardMaterial>, &FadeMaterial)>,
+    time: Res<Time>,
+    mut materials: ResMut<Assets<StandardMaterial>>,
+) {
+    let now = time.elapsed_seconds_f64();
+    for (entity, material_handle, data) in q_object.iter_mut() {
+        let end_time = data.start_time + data.duration;
+        let material = materials.get_mut(material_handle).unwrap();
+        if now > end_time {
+            material.base_color.set_alpha(data.value_end);
+            commands.entity(entity).remove::<FadeMaterial>();
+        }
+        else if now < data.start_time {
+            material.base_color.set_alpha(data.value_start);
+        }
+        else {
+            let progress = ((now - data.start_time) / data.duration) as f32;
+            let value = data.value_start + progress * (data.value_end - data.value_start);
+            material.base_color.set_alpha(value);
+        }
+    }
+}
+
+pub fn update_grow(
+    mut commands: Commands,
+    mut q_object: Query<(Entity, &mut Transform, &Grow3DObject)>,
+    time: Res<Time>,
+) {
+    let now = time.elapsed_seconds_f64();
+    for (entity, mut trans, data) in q_object.iter_mut() {
+        let end_time = data.start_time + data.duration;
+        if now > end_time {
+            trans.scale = Vec3::splat(data.scale_end);
+            commands.entity(entity).remove::<Grow3DObject>();
+        }
+        else if now < data.start_time {
+            trans.scale = Vec3::splat(data.scale_start);
+        }
+        else {
+            let progress = ((now - data.start_time) / data.duration) as f32;
+            let scale = data.scale_start + progress * (data.scale_end - data.scale_start);
+            trans.scale = Vec3::splat(scale);
+        }
+    }
+}
+
 fn play_animations(
     mut commands: Commands,
     mut players: Query<(Entity, &mut AnimationPlayer), Added<AnimationPlayer>>,

src/world.rs

@@ -38,6 +38,7 @@ impl Plugin for WorldPlugin {
     fn build(&self, app: &mut App) {
         app.add_systems(Startup, setup);
         app.add_systems(Update, handle_respawn.run_if(on_event::<RespawnEvent>()));
+        app.add_systems(Update, handle_despawn_at.run_if(any_with_component::<DespawnAt>));
         app.add_plugins(PhysicsPlugins::default());
         //app.add_plugins(PhysicsDebugPlugin::default());
         app.insert_resource(Gravity(DVec3::splat(0.0)));
@@ -65,6 +66,8 @@ struct Asteroid;
 pub struct Star;
 #[derive(Component)]
 pub struct DespawnOnPlayerDeath;
+#[derive(Component)]
+pub struct DespawnAt(pub f64);
 #[derive(Event)]
 pub struct RespawnEvent;
 
@@ -360,6 +363,19 @@ fn handle_despawn_asteroids(
     }
 }
 
+fn handle_despawn_at(
+    mut commands: Commands,
+    q_entity: Query<(Entity, &DespawnAt)>,
+    time: Res<Time>,
+) {
+    let now = time.elapsed_seconds_f64();
+    for (entity, despawn_at) in &q_entity {
+        if despawn_at.0 < now {
+            commands.entity(entity).despawn();
+        }
+    }
+}
+
 pub fn handle_respawn(
     ew_spawn: EventWriter<cmd::SpawnEvent>,
     mut achievement_tracker: ResMut<var::AchievementTracker>,