Implement particle groups, enabling simple particle trails.

Cargo.toml

@@ -144,6 +144,10 @@ required-features = [ "bevy/bevy_winit", "bevy/bevy_pbr", "bevy/png", "3d" ]
 name = "2d"
 required-features = [ "bevy/bevy_winit", "bevy/bevy_sprite", "2d" ]
 
+[[example]]
+name = "worms"
+required-features = [ "bevy/bevy_winit", "bevy/bevy_pbr", "3d" ]
+
 [workspace]
 resolver = "2"
 members = ["."]

examples/2d.rs

@@ -115,7 +115,7 @@ fn setup(
     // By default the asset spawns the particles at Z=0.
     let spawner = Spawner::rate(30.0.into());
     let effect = effects.add(
-        EffectAsset::new(4096, spawner, writer.finish())
+        EffectAsset::new(vec![4096], spawner, writer.finish())
             .with_name("2d")
             .init(init_pos)
             .init(init_vel)

examples/activate.rs

@@ -11,10 +11,7 @@ use bevy::{
     log::LogPlugin,
     prelude::*,
     render::{
-        camera::{Projection, ScalingMode},
-        render_resource::WgpuFeatures,
-        settings::WgpuSettings,
-        RenderPlugin,
+        camera::ScalingMode, render_resource::WgpuFeatures, settings::WgpuSettings, RenderPlugin,
     },
 };
 #[cfg(feature = "examples_world_inspector")]
@@ -136,7 +133,7 @@ fn setup(
     };
 
     let effect = effects.add(
-        EffectAsset::new(32768, spawner, writer.finish())
+        EffectAsset::new(vec![32768], spawner, writer.finish())
             .with_name("activate")
             .init(init_pos)
             .init(init_vel)

examples/billboard.rs

@@ -150,7 +150,7 @@ fn setup(
     let rotation_attr = writer.attr(Attribute::F32_0).expr();
 
     let effect = effects.add(
-        EffectAsset::new(32768, Spawner::rate(64.0.into()), writer.finish())
+        EffectAsset::new(vec![32768], Spawner::rate(64.0.into()), writer.finish())
             .with_name("billboard")
             .with_alpha_mode(bevy_hanabi::AlphaMode::Mask(alpha_cutoff))
             .init(init_pos)

examples/circle.rs

@@ -145,7 +145,7 @@ fn setup(
 
     let effect = effects.add(
         EffectAsset::new(
-            32768,
+            vec![32768],
             Spawner::burst(32.0.into(), 8.0.into()),
             writer.finish(),
         )

examples/expr.rs

@@ -104,7 +104,7 @@ fn setup(mut commands: Commands, mut effects: ResMut<Assets<EffectAsset>>) {
     };
 
     let effect = effects.add(
-        EffectAsset::new(32768, Spawner::rate(500.0.into()), writer.finish())
+        EffectAsset::new(vec![32768], Spawner::rate(500.0.into()), writer.finish())
             .with_name("whirlwind")
             .init(init_pos)
             .init(init_age)

examples/firework.rs

@@ -110,7 +110,7 @@ fn setup(mut commands: Commands, mut effects: ResMut<Assets<EffectAsset>>) {
     };
 
     let effect = EffectAsset::new(
-        32768,
+        vec![32768],
         Spawner::burst(2500.0.into(), 2.0.into()),
         writer.finish(),
     )

examples/force_field.rs

@@ -18,9 +18,7 @@ use bevy::{
     core_pipeline::tonemapping::Tonemapping,
     log::LogPlugin,
     prelude::*,
-    render::{
-        camera::Projection, render_resource::WgpuFeatures, settings::WgpuSettings, RenderPlugin,
-    },
+    render::{render_resource::WgpuFeatures, settings::WgpuSettings, RenderPlugin},
 };
 #[cfg(feature = "examples_world_inspector")]
 use bevy_inspector_egui::quick::WorldInspectorPlugin;
@@ -80,12 +78,7 @@ struct RepulsorMarker(pub bool);
 
 #[cfg(feature = "examples_world_inspector")]
 mod inspector {
-    use bevy::{
-        ecs::system::{Local, Resource},
-        prelude::*,
-        reflect::Reflect,
-        window::PrimaryWindow,
-    };
+    use bevy::{ecs::system::Resource, prelude::*, reflect::Reflect, window::PrimaryWindow};
     use bevy_egui::EguiContext;
     use bevy_hanabi::EffectProperties;
     use bevy_inspector_egui::{inspector_options::std_options::NumberDisplay, prelude::*};
@@ -338,7 +331,7 @@ fn setup(
 
     // Force field effects
     let effect = effects.add(
-        EffectAsset::new(32768, spawner, writer.finish())
+        EffectAsset::new(vec![32768], spawner, writer.finish())
             .with_name("force_field")
             .with_property("repulsor_position", Value::Vector(REPULSOR_POS.into()))
             .with_property("attraction_accel", Value::Scalar(20.0.into()))

examples/gradient.rs

@@ -102,7 +102,7 @@ fn setup(
     };
 
     let effect = effects.add(
-        EffectAsset::new(32768, Spawner::rate(1000.0.into()), writer.finish())
+        EffectAsset::new(vec![32768], Spawner::rate(1000.0.into()), writer.finish())
             .with_name("gradient")
             .init(init_pos)
             .init(init_vel)

examples/init.rs

@@ -72,15 +72,19 @@ where
 
     let init = make_modifier(&writer);
 
-    EffectAsset::new(32768, Spawner::once(COUNT.into(), true), writer.finish())
-        .with_name(name)
-        .with_simulation_space(SimulationSpace::Local)
-        .init(init)
-        .render(OrientModifier::new(OrientMode::FaceCameraPosition))
-        .render(SetColorModifier {
-            color: COLOR.into(),
-        })
-        .render(SetSizeModifier { size: SIZE.into() })
+    EffectAsset::new(
+        vec![32768],
+        Spawner::once(COUNT.into(), true),
+        writer.finish(),
+    )
+    .with_name(name)
+    .with_simulation_space(SimulationSpace::Local)
+    .init(init)
+    .render(OrientModifier::new(OrientMode::FaceCameraPosition))
+    .render(SetColorModifier {
+        color: COLOR.into(),
+    })
+    .render(SetSizeModifier { size: SIZE.into() })
 }
 
 fn spawn_effect(

examples/instancing.rs

@@ -253,7 +253,7 @@ fn setup(
     };
 
     let effect = effects.add(
-        EffectAsset::new(512, Spawner::rate(50.0.into()), writer.finish())
+        EffectAsset::new(vec![512], Spawner::rate(50.0.into()), writer.finish())
             .with_name("instancing")
             .init(init_pos)
             .init(init_vel)

examples/lifetime.rs

@@ -117,7 +117,7 @@ fn setup(
     };
     let effect1 = effects.add(
         EffectAsset::new(
-            512,
+            vec![512],
             Spawner::burst(50.0.into(), period.into()),
             writer1.finish(),
         )
@@ -172,7 +172,7 @@ fn setup(
     };
     let effect2 = effects.add(
         EffectAsset::new(
-            512,
+            vec![512],
             Spawner::burst(50.0.into(), period.into()),
             writer2.finish(),
         )
@@ -227,7 +227,7 @@ fn setup(
     };
     let effect3 = effects.add(
         EffectAsset::new(
-            512,
+            vec![512],
             Spawner::burst(50.0.into(), period.into()),
             writer3.finish(),
         )

examples/multicam.rs

@@ -83,7 +83,7 @@ fn make_effect(color: Color) -> EffectAsset {
         speed: writer.lit(6.).expr(),
     };
 
-    EffectAsset::new(32768, Spawner::rate(5.0.into()), writer.finish())
+    EffectAsset::new(vec![32768], Spawner::rate(5.0.into()), writer.finish())
         .with_name("effect")
         .init(init_pos)
         .init(init_vel)

examples/portal.rs

@@ -99,7 +99,7 @@ fn setup(mut commands: Commands, mut effects: ResMut<Assets<EffectAsset>>) {
     let tangent_accel = TangentAccelModifier::constant(&mut module, Vec3::ZERO, Vec3::Z, 30.);
 
     let effect1 = effects.add(
-        EffectAsset::new(32768, Spawner::rate(5000.0.into()), module)
+        EffectAsset::new(vec![16384, 16384], Spawner::rate(5000.0.into()), module)
             .with_name("portal")
             .init(init_pos)
             .init(init_age)

examples/random.rs

@@ -107,7 +107,7 @@ fn setup(
 
     let effect = effects.add(
         EffectAsset::new(
-            32768,
+            vec![32768],
             Spawner::burst(CpuValue::Uniform((1., 100.)), CpuValue::Uniform((1., 4.))),
             writer.finish(),
         )

examples/spawn.rs

@@ -135,7 +135,7 @@ fn setup(
     };
 
     let effect1 = effects.add(
-        EffectAsset::new(32768, Spawner::rate(500.0.into()), writer1.finish())
+        EffectAsset::new(vec![32768], Spawner::rate(500.0.into()), writer1.finish())
             .with_name("emit:rate")
             .with_property("my_accel", Vec3::new(0., -3., 0.).into())
             .init(init_pos1)
@@ -198,15 +198,19 @@ fn setup(
         speed: writer2.lit(2.).expr(),
     };
     let effect2 = effects.add(
-        EffectAsset::new(32768, Spawner::once(1000.0.into(), true), writer2.finish())
-            .with_name("emit:once")
-            .init(init_pos2)
-            .init(init_vel2)
-            .init(init_age2)
-            .init(init_lifetime2)
-            .render(ColorOverLifetimeModifier {
-                gradient: gradient2,
-            }),
+        EffectAsset::new(
+            vec![32768],
+            Spawner::once(1000.0.into(), true),
+            writer2.finish(),
+        )
+        .with_name("emit:once")
+        .init(init_pos2)
+        .init(init_vel2)
+        .init(init_age2)
+        .init(init_lifetime2)
+        .render(ColorOverLifetimeModifier {
+            gradient: gradient2,
+        }),
     );
 
     commands
@@ -266,7 +270,7 @@ fn setup(
 
     let effect3 = effects.add(
         EffectAsset::new(
-            32768,
+            vec![32768],
             Spawner::burst(400.0.into(), 3.0.into()),
             writer3.finish(),
         )

examples/spawn_on_command.rs

@@ -168,7 +168,7 @@ fn setup(
     let init_vel = SetAttributeModifier::new(Attribute::VELOCITY, velocity.expr());
 
     let effect = effects.add(
-        EffectAsset::new(32768, spawner, writer.finish())
+        EffectAsset::new(vec![32768], spawner, writer.finish())
             .with_name("spawn_on_command")
             .with_property("spawn_color", 0xFFFFFFFFu32.into())
             .with_property("normal", Vec3::ZERO.into())

examples/visibility.rs

@@ -119,7 +119,7 @@ fn setup(
     };
 
     let mut asset = EffectAsset::new(
-        4096,
+        vec![4096],
         Spawner::burst(50.0.into(), 15.0.into()),
         writer.finish(),
     )