diff --git a/content/effects.toml b/content/effects.toml
index 9414148..d0004d3 100644
--- a/content/effects.toml
+++ b/content/effects.toml
@@ -1,5 +1,5 @@
 [effect."small explosion"]
-sprite = "particle::explosion::small"
+sprite = "effect::explosion::small"
 lifetime = "inherit"
 inherit_velocity = "target"
 size = 8.0
@@ -11,7 +11,7 @@ fade_rng = 0.1
 
 
 [effect."large explosion"]
-sprite = "particle::explosion::large"
+sprite = "effect::explosion::large"
 lifetime = "inherit"
 inherit_velocity = "target"
 size = 25.0
@@ -23,7 +23,7 @@ fade_rng = 0.1
 
 
 [effect."huge explosion"]
-sprite = "particle::explosion::huge"
+sprite = "effect::explosion::huge"
 lifetime = "inherit"
 inherit_velocity = "target"
 size = 50.0
@@ -35,7 +35,7 @@ fade_rng = 0.1
 
 
 [effect."blue spark"]
-sprite = "particle::spark::blue"
+sprite = "effect::spark::blue"
 lifetime = 0.5
 lifetime_rng = 0.5
 inherit_velocity = "parent"
@@ -48,7 +48,7 @@ fade = 0.2
 fade_rng = 0.1
 
 [effect."yellow spark"]
-sprite = "particle::spark::yellow"
+sprite = "effect::spark::yellow"
 lifetime = "inherit"
 inherit_velocity = "parent"
 size = 4.0
@@ -60,7 +60,7 @@ fade = 0.2
 fade_rng = 0.1
 
 [effect."red spark"]
-sprite = "particle::spark::red"
+sprite = "effect::spark::red"
 lifetime = "inherit"
 inherit_velocity = "parent"
 size = 4.0
@@ -74,9 +74,9 @@ fade_rng = 0.1
 
 # Every effect has a parent, some effects have a target
 [effect."blaster impact"]
-sprite = "particle::blaster"
-lifetime = "inherit"         # number in seconds or inherit from sprite
-lifetime_rng = 0.0           # Random variation of lifetime (up to this value)
+sprite = "effect::blaster"
+lifetime = "inherit"       # number in seconds or inherit from sprite
+lifetime_rng = 0.0         # Random variation of lifetime (up to this value)
 
 size = 3.0     # sprite size, in game units
 size_rng = 1.0 # random size variation
@@ -102,6 +102,4 @@ fade_rng = 0.1
 
 # TODO:
 # effect probabilities & variants
-# multiple particles in one effect
-# document: effect vs particle
 # sprite lifetime/fps variation (and effects inherit lifetime later)
diff --git a/content/outfits.toml b/content/outfits.toml
index ebc5985..90e08ee 100644
--- a/content/outfits.toml
+++ b/content/outfits.toml
@@ -51,7 +51,7 @@ gun.projectile.collider.ball.radius = 2.0
 
 gun.projectile.impact_effect = "blaster impact"
 
-gun.projectile.expire_effect.sprite = "particle::blaster"
+gun.projectile.expire_effect.sprite = "effect::blaster"
 gun.projectile.expire_effect.lifetime = "inherit"
 gun.projectile.expire_effect.size = 3.0
 gun.projectile.expire_effect.velocity_scale_parent = 1.0
diff --git a/content/sprite.toml b/content/sprite.toml
index 6ec71e1..112b319 100644
--- a/content/sprite.toml
+++ b/content/sprite.toml
@@ -105,111 +105,111 @@ section.on.bot = "stop"
 section.on.timing.fps = 60
 section.on.frames = ["ui/planet-button-on.png"]
 
-[sprite."particle::blaster"]
+[sprite."effect::blaster"]
 timing.duration = 0.15
 frames = [
-	"particle/blaster/01.png",
-	"particle/blaster/02.png",
-	"particle/blaster/03.png",
-	"particle/blaster/04.png",
+	"effect/blaster/01.png",
+	"effect/blaster/02.png",
+	"effect/blaster/03.png",
+	"effect/blaster/04.png",
 ]
 
 
-[sprite."particle::explosion::tiny"]
+[sprite."effect::explosion::tiny"]
 timing.fps = 15
 frames = [
-	"particle/explosion-tiny/01.png",
-	"particle/explosion-tiny/02.png",
-	"particle/explosion-tiny/03.png",
-	"particle/explosion-tiny/04.png",
-	"particle/explosion-tiny/05.png",
-	"particle/explosion-tiny/06.png",
+	"effect/explosion-tiny/01.png",
+	"effect/explosion-tiny/02.png",
+	"effect/explosion-tiny/03.png",
+	"effect/explosion-tiny/04.png",
+	"effect/explosion-tiny/05.png",
+	"effect/explosion-tiny/06.png",
 ]
 
-[sprite."particle::explosion::small"]
+[sprite."effect::explosion::small"]
 timing.fps = 15
 frames = [
-	"particle/explosion-small/01.png",
-	"particle/explosion-small/02.png",
-	"particle/explosion-small/03.png",
-	"particle/explosion-small/04.png",
-	"particle/explosion-small/05.png",
-	"particle/explosion-small/06.png",
-	"particle/explosion-small/07.png",
+	"effect/explosion-small/01.png",
+	"effect/explosion-small/02.png",
+	"effect/explosion-small/03.png",
+	"effect/explosion-small/04.png",
+	"effect/explosion-small/05.png",
+	"effect/explosion-small/06.png",
+	"effect/explosion-small/07.png",
 ]
 
-[sprite."particle::explosion::medium"]
+[sprite."effect::explosion::medium"]
 timing.fps = 15
 frames = [
-	"particle/explosion-medium/01.png",
-	"particle/explosion-medium/02.png",
-	"particle/explosion-medium/03.png",
-	"particle/explosion-medium/04.png",
-	"particle/explosion-medium/05.png",
-	"particle/explosion-medium/06.png",
-	"particle/explosion-medium/07.png",
-	"particle/explosion-medium/08.png",
+	"effect/explosion-medium/01.png",
+	"effect/explosion-medium/02.png",
+	"effect/explosion-medium/03.png",
+	"effect/explosion-medium/04.png",
+	"effect/explosion-medium/05.png",
+	"effect/explosion-medium/06.png",
+	"effect/explosion-medium/07.png",
+	"effect/explosion-medium/08.png",
 ]
 
 
-[sprite."particle::explosion::large"]
+[sprite."effect::explosion::large"]
 timing.fps = 15
 frames = [
-	"particle/explosion-large/01.png",
-	"particle/explosion-large/02.png",
-	"particle/explosion-large/03.png",
-	"particle/explosion-large/04.png",
-	"particle/explosion-large/05.png",
-	"particle/explosion-large/06.png",
-	"particle/explosion-large/07.png",
-	"particle/explosion-large/08.png",
-	"particle/explosion-large/09.png",
+	"effect/explosion-large/01.png",
+	"effect/explosion-large/02.png",
+	"effect/explosion-large/03.png",
+	"effect/explosion-large/04.png",
+	"effect/explosion-large/05.png",
+	"effect/explosion-large/06.png",
+	"effect/explosion-large/07.png",
+	"effect/explosion-large/08.png",
+	"effect/explosion-large/09.png",
 ]
 
-[sprite."particle::explosion::huge"]
+[sprite."effect::explosion::huge"]
 timing.fps = 15
 frames = [
-	"particle/explosion-huge/01.png",
-	"particle/explosion-huge/02.png",
-	"particle/explosion-huge/03.png",
-	"particle/explosion-huge/04.png",
-	"particle/explosion-huge/05.png",
-	"particle/explosion-huge/06.png",
-	"particle/explosion-huge/07.png",
-	"particle/explosion-huge/08.png",
-	"particle/explosion-huge/09.png",
-	"particle/explosion-huge/10.png",
+	"effect/explosion-huge/01.png",
+	"effect/explosion-huge/02.png",
+	"effect/explosion-huge/03.png",
+	"effect/explosion-huge/04.png",
+	"effect/explosion-huge/05.png",
+	"effect/explosion-huge/06.png",
+	"effect/explosion-huge/07.png",
+	"effect/explosion-huge/08.png",
+	"effect/explosion-huge/09.png",
+	"effect/explosion-huge/10.png",
 ]
 
 
-[sprite."particle::spark::blue"]
+[sprite."effect::spark::blue"]
 timing.duration = 0.3
 top = "reverse"
 bot = "reverse"
 frames = [
-	"particle/spark-blue/01.png",
-	"particle/spark-blue/02.png",
-	"particle/spark-blue/03.png",
-	"particle/spark-blue/04.png",
-	"particle/spark-blue/05.png",
+	"effect/spark-blue/01.png",
+	"effect/spark-blue/02.png",
+	"effect/spark-blue/03.png",
+	"effect/spark-blue/04.png",
+	"effect/spark-blue/05.png",
 ]
 
-[sprite."particle::spark::yellow"]
+[sprite."effect::spark::yellow"]
 timing.duration = 0.3
 timing.rng = 0.2
 frames = [
-	"particle/spark-yellow/01.png",
-	"particle/spark-yellow/02.png",
-	"particle/spark-yellow/03.png",
-	"particle/spark-yellow/04.png",
-	"particle/spark-yellow/05.png",
+	"effect/spark-yellow/01.png",
+	"effect/spark-yellow/02.png",
+	"effect/spark-yellow/03.png",
+	"effect/spark-yellow/04.png",
+	"effect/spark-yellow/05.png",
 ]
 
-[sprite."particle::spark::red"]
+[sprite."effect::spark::red"]
 timing.duration = 0.3
 timing.rng = 0.2
 frames = [
-	"particle/spark-red/01.png",
-	"particle/spark-red/02.png",
-	"particle/spark-red/03.png",
+	"effect/spark-red/01.png",
+	"effect/spark-red/02.png",
+	"effect/spark-red/03.png",
 ]
diff --git a/crates/content/src/part/effect.rs b/crates/content/src/part/effect.rs
index 828b972..81dccfb 100644
--- a/crates/content/src/part/effect.rs
+++ b/crates/content/src/part/effect.rs
@@ -124,46 +124,46 @@ pub(crate) mod syntax {
 	}
 }
 
-/// The particle a projectile will spawn when it hits something
+/// The effect a projectile will spawn when it hits something
 #[derive(Debug, Clone)]
 pub struct Effect {
 	/// This effect's handle
 	pub handle: EffectHandle,
 
-	/// The sprite to use for this particle.
+	/// The sprite to use for this effect.
 	pub sprite: SpriteHandle,
 
-	/// The height of this particle, in game units.
+	/// The height of this effect, in game units.
 	pub size: f32,
 
 	/// Random size variation
 	pub size_rng: f32,
 
-	/// How many seconds this particle should live
+	/// How many seconds this effect should live
 	pub lifetime: f32,
 
 	/// Random lifetime variation
 	pub lifetime_rng: f32,
 
-	/// The angle this particle points once spawned, in radians
+	/// The angle this effect points once spawned, in radians
 	pub angle: f32,
 
 	/// Random angle variation, in radians
 	pub angle_rng: f32,
 
-	/// How fast this particle spins, in radians/sec
+	/// How fast this effect spins, in radians/sec
 	pub angvel: f32,
 
 	/// Random angvel variation
 	pub angvel_rng: f32,
 
-	/// The amount of this particle's parent's velocity to inherit
+	/// The amount of this effect's parent's velocity to inherit
 	pub velocity_scale_parent: f32,
 
 	/// Parent velocity random variation
 	pub velocity_scale_parent_rng: f32,
 
-	/// The amount of this particle's parent's target velocity to inherit.
+	/// The amount of this effect's parent's target velocity to inherit.
 	/// If there is no target, this is zero.
 	pub velocity_scale_target: f32,
 
diff --git a/crates/content/src/part/outfit.rs b/crates/content/src/part/outfit.rs
index c398759..890a06e 100644
--- a/crates/content/src/part/outfit.rs
+++ b/crates/content/src/part/outfit.rs
@@ -229,10 +229,10 @@ pub struct Projectile {
 	/// The angle variation of this projectile, in radians
 	pub angle_rng: f32,
 
-	/// The particle this projectile will spawn when it hits something
+	/// The effect this projectile will spawn when it hits something
 	pub impact_effect: Option<EffectHandle>,
 
-	/// The particle this projectile will spawn when it expires
+	/// The effect this projectile will spawn when it expires
 	pub expire_effect: Option<EffectHandle>,
 
 	/// Collider parameters for this projectile
diff --git a/crates/content/src/part/ship.rs b/crates/content/src/part/ship.rs
index 061c4e2..3c9c3a9 100644
--- a/crates/content/src/part/ship.rs
+++ b/crates/content/src/part/ship.rs
@@ -403,7 +403,7 @@ impl crate::Build for Ship {
 						// We apply this pointwise so that local points inside the collider work as we expect.
 						//
 						// If we don't, rapier2 will compute local points pre-rotation,
-						// which will break particle placement on top of ships (i.e, collapse effects)
+						// which will break effect placement on top of ships (i.e, collapse effects)
 						Rotation2::new(to_radians(-90.0))
 							* Point2::new(x[0] * (size / 2.0) * aspect, x[1] * size / 2.0)
 					})
diff --git a/crates/galactica/src/game.rs b/crates/galactica/src/game.rs
index 594266f..c9c3a5d 100644
--- a/crates/galactica/src/game.rs
+++ b/crates/galactica/src/game.rs
@@ -9,7 +9,7 @@ use std::time::Instant;
 pub struct Game {
 	// Core game data
 	ct: Content,
-	systemsim: PhysSim,
+	phys_sim: PhysSim,
 	timing: Timing,
 	start_instant: Instant,
 
@@ -22,7 +22,7 @@ unsafe impl<'a> Send for Game {}
 
 impl<'a> Game {
 	pub fn make_player(&mut self) -> PhysSimShipHandle {
-		let player = self.systemsim.add_ship(
+		let player = self.phys_sim.add_ship(
 			&self.ct,
 			ShipHandle { index: 0 },
 			FactionHandle { index: 0 },
@@ -30,7 +30,7 @@ impl<'a> Game {
 			Point2::new(0.0, 4000.0),
 		);
 
-		let s = self.systemsim.get_ship_mut(&player).unwrap();
+		let s = self.phys_sim.get_ship_mut(&player).unwrap();
 		s.add_outfits(
 			&self.ct,
 			[
@@ -44,9 +44,9 @@ impl<'a> Game {
 	}
 
 	pub fn new(ct: Content) -> Self {
-		let mut systemsim = PhysSim::new(&ct, SystemHandle { index: 0 });
+		let mut phys_sim = PhysSim::new(&ct, SystemHandle { index: 0 });
 
-		let a = systemsim.add_ship(
+		let a = phys_sim.add_ship(
 			&ct,
 			ShipHandle { index: 0 },
 			FactionHandle { index: 1 },
@@ -54,7 +54,7 @@ impl<'a> Game {
 			Point2::new(1000.0, 0.0),
 		);
 
-		let s = systemsim.get_ship_mut(&a).unwrap();
+		let s = phys_sim.get_ship_mut(&a).unwrap();
 		s.add_outfits(
 			&ct,
 			[
@@ -64,7 +64,7 @@ impl<'a> Game {
 			],
 		);
 
-		let a = systemsim.add_ship(
+		let a = phys_sim.add_ship(
 			&ct,
 			ShipHandle { index: 0 },
 			FactionHandle { index: 0 },
@@ -72,7 +72,7 @@ impl<'a> Game {
 			Point2::new(200.0, 2000.0),
 		);
 
-		let s = systemsim.get_ship_mut(&a).unwrap();
+		let s = phys_sim.get_ship_mut(&a).unwrap();
 		s.add_outfits(
 			&ct,
 			[
@@ -84,7 +84,7 @@ impl<'a> Game {
 
 		Game {
 			ct,
-			systemsim,
+			phys_sim,
 			timing: Timing::new(),
 			start_instant: Instant::now(),
 			last_update: Instant::now(),
@@ -93,12 +93,12 @@ impl<'a> Game {
 	}
 
 	pub fn update_player_controls(&mut self, player: &mut PlayerAgent) {
-		self.systemsim.update_player_controls(&self.ct, player)
+		self.phys_sim.update_player_controls(&self.ct, player)
 	}
 
 	pub fn step(&mut self, phys_img: &PhysImage) {
 		self.timing.start_frame();
-		self.systemsim.step(
+		self.phys_sim.step(
 			PhysStepResources {
 				ct: &self.ct,
 				t: self.last_update.elapsed().as_secs_f32() * self.time_scale,
@@ -112,7 +112,7 @@ impl<'a> Game {
 	}
 
 	pub fn update_image(&self, phys_img: &mut PhysImage) {
-		self.systemsim.update_image(phys_img);
+		self.phys_sim.update_image(phys_img);
 	}
 }
 
diff --git a/crates/render/shaders/object.wgsl b/crates/render/shaders/object.wgsl
index d6f5bea..3aaa152 100644
--- a/crates/render/shaders/object.wgsl
+++ b/crates/render/shaders/object.wgsl
@@ -4,6 +4,7 @@ struct InstanceInput {
 	@location(2) texture_index: vec2<u32>,
 	@location(3) texture_fade: f32,
 	@location(4) object_index: u32,
+	@location(5) color: vec4<f32>,
 };
 
 struct VertexInput {
@@ -18,6 +19,7 @@ struct VertexOutput {
 	@location(2) texture_coords_a: vec2<f32>,
 	@location(3) texture_index_b: u32,
 	@location(4) texture_coords_b: vec2<f32>,
+	@location(5) color: vec4<f32>,
 };
 
 
@@ -137,8 +139,7 @@ fn vertex_main(
 		);
 	}
 
-
-
+	out.color = instance.color;
 	out.tween = instance.texture_fade;
 
 	// Texture 0 is special, it's the empty texture
@@ -212,7 +213,7 @@ fn fragment_main(in: VertexOutput) -> @location(0) vec4<f32> {
 		texture_a,
 		texture_b,
 		in.tween
-	);
+	) * in.color;
 
 
 	return color;
diff --git a/crates/render/src/gpustate/phys.rs b/crates/render/src/gpustate/phys.rs
index c9c3db6..15d2e16 100644
--- a/crates/render/src/gpustate/phys.rs
+++ b/crates/render/src/gpustate/phys.rs
@@ -1,4 +1,4 @@
-//! GPUState routines for drawing items in a systemsim
+//! GPUState routines for drawing objects in a system
 
 use bytemuck;
 use galactica_system::data::ShipState;
@@ -88,6 +88,7 @@ impl GPUState {
 				texture_index: anim_state.texture_index(),
 				texture_fade: anim_state.fade,
 				object_index: idx as u32,
+				color: [1.0, 1.0, 1.0, 1.0],
 			});
 
 			if {
@@ -127,6 +128,7 @@ impl GPUState {
 						texture_index: anim_state.texture_index(),
 						texture_fade: anim_state.fade,
 						object_index: self.state.get_object_counter() as u32,
+						color: [1.0, 1.0, 1.0, 1.0],
 					});
 				}
 			}
@@ -189,6 +191,7 @@ impl GPUState {
 				texture_index: anim_state.texture_index(),
 				texture_fade: anim_state.fade,
 				object_index: idx as u32,
+				color: [1.0, 1.0, 1.0, 1.0],
 			});
 		}
 	}
@@ -246,6 +249,7 @@ impl GPUState {
 				texture_index: [texture_a, texture_a],
 				texture_fade: 1.0,
 				object_index: idx as u32,
+				color: [1.0, 1.0, 1.0, 1.0],
 			});
 		}
 	}
@@ -310,6 +314,7 @@ impl GPUState {
 				texture_index: anim_state.texture_index(),
 				texture_fade: anim_state.fade,
 				object_index: idx as u32,
+				color: [1.0, 1.0, 1.0, p.get_fade()],
 			});
 		}
 	}
diff --git a/crates/render/src/vertexbuffer/types.rs b/crates/render/src/vertexbuffer/types.rs
index 5703311..a4f10d5 100644
--- a/crates/render/src/vertexbuffer/types.rs
+++ b/crates/render/src/vertexbuffer/types.rs
@@ -95,6 +95,11 @@ pub struct ObjectInstance {
 
 	/// Which object this instance is for
 	pub object_index: u32,
+
+	/// This lets us color sprites dynamically:
+	/// Each fragment's color is multiplied by this value.
+	/// Fill this array with ones if no recoloring should be done.
+	pub color: [f32; 4],
 }
 
 impl BufferObject for ObjectInstance {
@@ -124,6 +129,12 @@ impl BufferObject for ObjectInstance {
 					shader_location: 4,
 					format: wgpu::VertexFormat::Uint32,
 				},
+				// Color
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 4]>() as wgpu::BufferAddress,
+					shader_location: 5,
+					format: wgpu::VertexFormat::Float32x4,
+				},
 			],
 		}
 	}
diff --git a/crates/system/src/phys/objects/effect.rs b/crates/system/src/phys/objects/effect.rs
index 7b82ac9..a905074 100644
--- a/crates/system/src/phys/objects/effect.rs
+++ b/crates/system/src/phys/objects/effect.rs
@@ -5,23 +5,23 @@ use rapier2d::dynamics::{RigidBodyBuilder, RigidBodyHandle, RigidBodyType};
 
 use crate::phys::{PhysStepResources, PhysWrapper};
 
-/// Instructions to create a new particle
+/// A single instance of an effect
 #[derive(Debug, Clone)]
 pub struct PhysEffect {
-	/// The sprite to use for this particle
+	/// The sprite to use for this effect
 	pub anim: SpriteAutomaton,
 
-	/// This particle's velocity, in world coordinates
+	/// This effect's velocity, in world coordinates
 	pub rigid_body: RigidBodyHandle,
 
-	/// This particle's lifetime, in seconds
+	/// This effect's lifetime, in seconds
 	lifetime: f32,
 
-	/// The size of this particle,
+	/// The size of this effect,
 	/// given as height in world units.
 	pub size: f32,
 
-	/// Fade this particle over this many seconds as it expires
+	/// Fade this effect over this many seconds as it expires
 	pub fade: f32,
 
 	/// If true, this effect has been destroyed,
@@ -30,7 +30,7 @@ pub struct PhysEffect {
 }
 
 impl PhysEffect {
-	/// Create a new particle inside `Wrapper`
+	/// Create a new effect inside `Wrapper`
 	pub fn new(
 		ct: &Content,
 		wrapper: &mut PhysWrapper,
@@ -104,4 +104,9 @@ impl PhysEffect {
 	pub fn is_destroyed(&self) -> bool {
 		self.is_destroyed
 	}
+
+	/// The remaining lifetime of this effect, in seconds
+	pub fn remaining_lifetime(&self) -> f32 {
+		self.lifetime
+	}
 }
diff --git a/crates/system/src/phys/objects/ship/collapse.rs b/crates/system/src/phys/objects/ship/collapse.rs
index b7f79b3..5350d0d 100644
--- a/crates/system/src/phys/objects/ship/collapse.rs
+++ b/crates/system/src/phys/objects/ship/collapse.rs
@@ -69,7 +69,7 @@ impl ShipCollapseSequence {
 		// The fraction of this collapse sequence that has been played
 		let frac_done = self.elapsed / self.total_length;
 
-		// TODO: slight random offset for event particles
+		// TODO: slight random offset for event effects
 
 		// Trigger collapse events
 		for event in &ship_content.collapse.events {
@@ -109,7 +109,7 @@ impl ShipCollapseSequence {
 
 		// Create collapse effects
 		for spawner in &ship_content.collapse.effects {
-			// Probability of adding a particle this frame.
+			// Probability of adding an effect instance this frame.
 			// The area of this function over [0, 1] should be 1.
 			let pdf = |x: f32| {
 				let f = 0.2;
diff --git a/crates/system/src/phys/objects/ship/ship.rs b/crates/system/src/phys/objects/ship/ship.rs
index 59036fd..75c1c4e 100644
--- a/crates/system/src/phys/objects/ship/ship.rs
+++ b/crates/system/src/phys/objects/ship/ship.rs
@@ -416,7 +416,7 @@ impl PhysShip {
 		}
 	}
 
-	/// Spawn this frame's particles
+	/// Spawn this frame's effects
 	fn step_effects(
 		&mut self,
 		res: &mut PhysStepResources,
diff --git a/crates/system/src/phys/physimage.rs b/crates/system/src/phys/physimage.rs
index 56a8f88..ecab455 100644
--- a/crates/system/src/phys/physimage.rs
+++ b/crates/system/src/phys/physimage.rs
@@ -93,3 +93,12 @@ pub struct PhysEffectImage {
 	/// The effect's rigidbody
 	pub rigidbody: RigidBody,
 }
+
+impl PhysEffectImage {
+	/// Get this effect's fade value
+	pub fn get_fade(&self) -> f32 {
+		let f = self.effect.fade;
+		let l = self.effect.remaining_lifetime();
+		return 1f32.min(l / f);
+	}
+}
diff --git a/crates/system/src/phys/physsim.rs b/crates/system/src/phys/physsim.rs
index 3a293c5..9ed54b2 100644
--- a/crates/system/src/phys/physsim.rs
+++ b/crates/system/src/phys/physsim.rs
@@ -365,8 +365,8 @@ impl PhysSim {
 		self.projectiles.values()
 	}
 
-	/// Iterate over all particles in this physics system
-	pub fn iter_particles(&self) -> impl Iterator<Item = &PhysEffect> + '_ {
+	/// Iterate over all effects in this physics system
+	pub fn iter_effects(&self) -> impl Iterator<Item = &PhysEffect> + '_ {
 		self.effects.iter()
 	}
 }