diff --git a/crates/content/src/part/outfitspace.rs b/crates/content/src/part/outfitspace.rs
index c12aaf5..790febf 100644
--- a/crates/content/src/part/outfitspace.rs
+++ b/crates/content/src/part/outfitspace.rs
@@ -1,3 +1,5 @@
+use std::ops::{Add, AddAssign, Sub, SubAssign};
+
 pub(crate) mod syntax {
 	use serde::Deserialize;
 
@@ -9,6 +11,8 @@ pub(crate) mod syntax {
 	}
 }
 
+// TODO: user-defined space values
+
 /// Represents outfit space, either that available in a ship
 /// or that used by an outfit.
 #[derive(Debug, Clone, Copy)]
@@ -25,7 +29,7 @@ pub struct OutfitSpace {
 }
 
 impl OutfitSpace {
-	/// Make a new, zero OutfitSpace
+	/// Make a new, zeroed OutfitSpace
 	pub fn new() -> Self {
 		Self {
 			outfit: 0,
@@ -34,28 +38,54 @@ impl OutfitSpace {
 		}
 	}
 
-	/// Does this outfit contain `smaller`?
+	/// Can this outfit contain `smaller`?
 	pub fn can_contain(&self, smaller: &Self) -> bool {
-		self.outfit >= (smaller.outfit + smaller.weapon + smaller.engine)
+		self.outfit >= smaller.outfit
 			&& self.weapon >= smaller.weapon
 			&& self.engine >= smaller.engine
 	}
+}
 
-	/// Free outfit space
-	pub fn free(&mut self, rhs: &Self) {
-		self.outfit += rhs.outfit + rhs.weapon + rhs.engine;
-		self.weapon += rhs.weapon;
-		self.engine += rhs.engine;
+impl Sub for OutfitSpace {
+	type Output = Self;
+
+	fn sub(self, rhs: Self) -> Self::Output {
+		OutfitSpace {
+			outfit: self.outfit - rhs.outfit,
+			weapon: self.weapon - rhs.weapon,
+			engine: self.engine - rhs.engine,
+		}
 	}
+}
 
-	/// Occupy outfit space
-	pub fn occupy(&mut self, rhs: &Self) {
-		self.outfit -= rhs.outfit + rhs.weapon + rhs.engine;
+impl SubAssign for OutfitSpace {
+	fn sub_assign(&mut self, rhs: Self) {
+		self.outfit -= rhs.outfit;
 		self.weapon -= rhs.weapon;
 		self.engine -= rhs.engine;
 	}
 }
 
+impl Add for OutfitSpace {
+	type Output = Self;
+
+	fn add(self, rhs: Self) -> Self::Output {
+		OutfitSpace {
+			outfit: self.outfit + rhs.outfit,
+			weapon: self.weapon + rhs.weapon,
+			engine: self.engine + rhs.engine,
+		}
+	}
+}
+
+impl AddAssign for OutfitSpace {
+	fn add_assign(&mut self, rhs: Self) {
+		self.outfit += rhs.outfit;
+		self.weapon += rhs.weapon;
+		self.engine += rhs.engine;
+	}
+}
+
 impl From<syntax::OutfitSpace> for OutfitSpace {
 	fn from(value: syntax::OutfitSpace) -> Self {
 		Self {
diff --git a/crates/content/src/part/ship.rs b/crates/content/src/part/ship.rs
index cdd931d..4458146 100644
--- a/crates/content/src/part/ship.rs
+++ b/crates/content/src/part/ship.rs
@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std::{collections::HashMap, hash::Hash};
 
 use anyhow::{bail, Context, Result};
 use cgmath::Point2;
@@ -160,11 +160,28 @@ pub struct EnginePoint {
 /// A gun point on a ship.
 #[derive(Debug, Clone)]
 pub struct GunPoint {
+	/// This gun point's index in this ship
+	pub idx: u32,
+
 	/// This gun point's position, in game units,
 	/// relative to the ship's center.
 	pub pos: Point2<f32>,
 }
 
+impl Eq for GunPoint {}
+impl PartialEq for GunPoint {
+	fn eq(&self, other: &Self) -> bool {
+		self.idx == other.idx
+	}
+}
+
+// We use a hashmap of these in OutfitSet
+impl Hash for GunPoint {
+	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+		self.idx.hash(state);
+	}
+}
+
 /// Parameters for a ship's collapse sequence
 #[derive(Debug, Clone)]
 pub struct ShipCollapse {
@@ -345,6 +362,18 @@ impl crate::Build for Ship {
 				}
 			};
 
+			// TODO: document this
+			let mut guns = Vec::new();
+			for g in ship.guns {
+				guns.push(GunPoint {
+					idx: guns.len() as u32,
+					pos: Point2 {
+						x: g.x * size * aspect / 2.0,
+						y: g.y * size / 2.0,
+					},
+				})
+			}
+
 			ct.ships.push(Self {
 				aspect,
 				collapse,
@@ -370,16 +399,7 @@ impl crate::Build for Ship {
 					})
 					.collect(),
 
-				guns: ship
-					.guns
-					.iter()
-					.map(|e| GunPoint {
-						pos: Point2 {
-							x: e.x * size * aspect / 2.0,
-							y: e.y * size / 2.0,
-						},
-					})
-					.collect(),
+				guns,
 
 				collision: Collision {
 					indices: (0..ship.collision.len())
diff --git a/crates/gameobject/src/lib.rs b/crates/gameobject/src/lib.rs
index 17a5192..003dfcd 100644
--- a/crates/gameobject/src/lib.rs
+++ b/crates/gameobject/src/lib.rs
@@ -4,14 +4,10 @@
 //! of every ship in the game, but it has no understanding of physics.
 //! That is done in `galactica_world`.
 
-mod outfits;
 mod projectile;
 mod ship;
 mod system;
-mod systemobject;
 
-pub use outfits::{OutfitSet, OutfitStatSum, ShipGun};
 pub use projectile::Projectile;
 pub use ship::Ship;
-pub use system::System;
-pub use systemobject::SystemObject;
+pub use system::{System, SystemObject};
diff --git a/crates/gameobject/src/outfits.rs b/crates/gameobject/src/outfits.rs
deleted file mode 100644
index e48f88f..0000000
--- a/crates/gameobject/src/outfits.rs
+++ /dev/null
@@ -1,203 +0,0 @@
-use content::{EnginePoint, OutfitHandle, SpriteHandle};
-use galactica_content as content;
-
-/// Represents a gun attached to a specific ship at a certain gunpoint.
-#[derive(Debug)]
-pub struct ShipGun {
-	/// The kind of gun this is
-	pub kind: content::Gun,
-
-	/// How many seconds we must wait before this gun can fire
-	pub cooldown: f32,
-
-	/// Index of the gunpoint this gun is attached to
-	pub point: usize,
-}
-
-impl ShipGun {
-	/// Make a new shipgun
-	pub fn new(kind: &content::Gun, point: usize) -> Self {
-		Self {
-			kind: kind.clone(),
-			point,
-			cooldown: 0.0,
-		}
-	}
-}
-
-/// This struct keeps track of the combined stats of a set of outfits.
-/// It does NOT check for sanity (e.g, removing an outfit that was never added)
-/// That is handled by ShipOutfits.
-#[derive(Debug)]
-pub struct OutfitStatSum {
-	pub engine_thrust: f32,
-	pub steer_power: f32,
-	pub engine_flare_sprites: Vec<content::SpriteHandle>,
-	pub shield_strength: f32,
-
-	// Delay, generation
-	pub shield_generators: Vec<(OutfitHandle, f32, f32)>,
-}
-
-impl OutfitStatSum {
-	pub fn new() -> Self {
-		Self {
-			engine_thrust: 0.0,
-			steer_power: 0.0,
-			engine_flare_sprites: Vec::new(),
-			shield_strength: 0.0,
-			shield_generators: Vec::new(),
-		}
-	}
-
-	pub fn add(&mut self, o: &content::Outfit) {
-		self.engine_thrust += o.engine_thrust;
-		if let Some(t) = o.engine_flare_sprite {
-			self.engine_flare_sprites.push(t);
-		};
-		self.steer_power += o.steer_power;
-		self.shield_strength += o.shield_strength;
-		self.shield_generators
-			.push((o.handle, o.shield_delay, o.shield_generation));
-	}
-
-	pub fn remove(&mut self, o: &content::Outfit) {
-		self.engine_thrust -= o.engine_thrust;
-		if let Some(t) = o.engine_flare_sprite {
-			self.engine_flare_sprites.remove(
-				self.engine_flare_sprites
-					.iter()
-					.position(|x| *x == t)
-					.unwrap(),
-			);
-		}
-		self.steer_power -= o.steer_power;
-		self.shield_strength -= o.shield_strength;
-		{
-			// Assume such an index exists
-			let index = self
-				.shield_generators
-				.iter()
-				.position(|(h, _, _)| *h == o.handle)
-				.unwrap();
-			self.shield_generators.remove(index);
-		}
-	}
-}
-
-/// Represents a set of outfits attached to a ship.
-/// Keeps track of the sum of their stats, so it mustn't be re-computed every frame.
-#[derive(Debug)]
-pub struct OutfitSet {
-	/// The total sum of the stats this set of outfits provides
-	stats: OutfitStatSum,
-
-	//pub total_space: content::OutfitSpace,
-	available_space: content::OutfitSpace,
-	outfits: Vec<content::OutfitHandle>,
-	guns: Vec<ShipGun>,
-	enginepoints: Vec<content::EnginePoint>,
-	gunpoints: Vec<content::GunPoint>,
-}
-
-impl<'a> OutfitSet {
-	/// Make a new outfit array
-	pub fn new(content: &content::Ship) -> Self {
-		Self {
-			stats: OutfitStatSum::new(),
-			outfits: Vec::new(),
-			guns: Vec::new(),
-			available_space: content.space.clone(),
-			//total_space: content.space.clone(),
-			enginepoints: content.engines.clone(),
-			gunpoints: content.guns.clone(),
-		}
-	}
-
-	/// Does this outfit set contain the specified outfit?
-	pub fn contains_outfit(&self, o: content::OutfitHandle) -> bool {
-		match self.outfits.iter().position(|x| *x == o) {
-			Some(_) => true,
-			None => false,
-		}
-	}
-
-	pub fn stat_sum(&self) -> &OutfitStatSum {
-		&self.stats
-	}
-
-	/// Add an outfit to this ship.
-	/// Returns true on success, and false on failure
-	/// TODO: failure reason enum
-	pub fn add(&mut self, ct: &content::Content, o: content::OutfitHandle) -> bool {
-		let outfit = ct.get_outfit(o);
-		if !self.available_space.can_contain(&outfit.space) {
-			return false;
-		}
-		self.available_space.occupy(&outfit.space);
-		self.stats.add(&outfit);
-		self.outfits.push(o);
-		return true;
-	}
-
-	/// Remove an outfit from this set
-	pub fn remove(&mut self, ct: &content::Content, o: content::OutfitHandle) {
-		let outfit = ct.get_outfit(o);
-		let i = match self.outfits.iter().position(|x| *x == o) {
-			Some(i) => i,
-			None => panic!("removed non-existing outfit"),
-		};
-		self.available_space.free(&outfit.space);
-		self.outfits.remove(i);
-	}
-
-	/// Add a gun to this outfit set.
-	/// This automatically attaches the gun to the first available gunpoint,
-	/// and returns false (applying no changes) if no points are available.
-	pub fn add_gun(&mut self, ct: &content::Content, g: content::GunHandle) -> bool {
-		// Find first unused point
-		let mut p = None;
-		'outer: for i in 0..self.gunpoints.len() {
-			for g in &self.guns {
-				if g.point == i {
-					continue 'outer;
-				}
-			}
-			p = Some(i);
-			break;
-		}
-		let gun = ct.get_gun(g);
-
-		// All points are taken
-		if p.is_none() {
-			return false;
-		}
-
-		let sg = ShipGun::new(gun, p.unwrap());
-		self.guns.push(sg);
-		return true;
-	}
-
-	/// Iterate over all guns in this outfitset
-	pub fn iter_guns(&mut self) -> impl Iterator<Item = &mut ShipGun> {
-		self.guns.iter_mut()
-	}
-
-	/// Iterate over all guns and the gunpoints they're attached to
-	pub fn iter_guns_points(&mut self) -> impl Iterator<Item = (&mut ShipGun, &content::GunPoint)> {
-		self.guns
-			.iter_mut()
-			.map(|x| (&self.gunpoints[x.point], x))
-			.map(|(a, b)| (b, a))
-	}
-
-	// TODO: move to ship
-	/// Iterate over all ships in this physics system
-	pub fn iter_enginepoints(&self) -> impl Iterator<Item = &EnginePoint> + '_ {
-		self.enginepoints.iter()
-	}
-
-	pub fn get_flare_sprite(&self) -> Option<SpriteHandle> {
-		self.stats.engine_flare_sprites.iter().next().map(|x| *x)
-	}
-}
diff --git a/crates/gameobject/src/ship.rs b/crates/gameobject/src/ship.rs
deleted file mode 100644
index 4563ea2..0000000
--- a/crates/gameobject/src/ship.rs
+++ /dev/null
@@ -1,112 +0,0 @@
-use rand::Rng;
-use std::time::Instant;
-
-use crate::{OutfitSet, Projectile};
-use galactica_content as content;
-
-#[derive(Debug)]
-pub struct Ship {
-	pub handle: content::ShipHandle,
-	pub faction: content::FactionHandle,
-	pub outfits: OutfitSet,
-	pub last_hit: Instant,
-
-	// TODO: unified ship stats struct, like space
-	// TODO: unified outfit stats struct: check
-	pub hull: f32,
-	pub shields: f32,
-}
-
-impl Ship {
-	pub fn new(
-		ct: &content::Content,
-		handle: content::ShipHandle,
-		faction: content::FactionHandle,
-		outfits: OutfitSet,
-	) -> Self {
-		let s = ct.get_ship(handle);
-		let shields = outfits.stat_sum().shield_strength;
-		Ship {
-			handle: handle,
-			faction,
-			outfits,
-			hull: s.hull,
-			shields,
-			last_hit: Instant::now(),
-		}
-	}
-
-	pub fn is_dead(&self) -> bool {
-		self.hull <= 0.0
-	}
-
-	/// Called whenever a projectile hits this ship.
-	/// Returns true if that projectile should be destroyed and false otherwise.
-	pub fn handle_projectile_collision(&mut self, ct: &content::Content, p: &Projectile) -> bool {
-		let f = ct.get_faction(self.faction);
-		let r = f.relationships.get(&p.faction).unwrap();
-		match r {
-			content::Relationship::Hostile => {
-				let mut d = p.content.damage;
-				if self.is_dead() {
-					return true;
-				}
-				if self.shields >= d {
-					self.shields -= d
-				} else {
-					d -= self.shields;
-					self.shields = 0.0;
-					self.hull -= d;
-				}
-				self.last_hit = Instant::now();
-
-				return true;
-			}
-			_ => return false,
-		}
-	}
-
-	pub fn fire_guns(&mut self) -> Vec<(Projectile, content::GunPoint)> {
-		if self.is_dead() {
-			return vec![];
-		}
-
-		self.outfits
-			.iter_guns_points()
-			.filter(|(g, _)| g.cooldown <= 0.0)
-			.map(|(g, p)| {
-				let mut rng = rand::thread_rng();
-				g.cooldown = g.kind.rate + &rng.gen_range(-g.kind.rate_rng..=g.kind.rate_rng);
-
-				let lifetime = g.kind.projectile.lifetime
-					+ rng.gen_range(
-						-g.kind.projectile.lifetime_rng..=g.kind.projectile.lifetime_rng,
-					);
-
-				(
-					Projectile {
-						content: g.kind.projectile.clone(),
-						lifetime: 0f32.max(lifetime),
-						faction: self.faction,
-					},
-					p.clone(),
-				)
-			})
-			.collect()
-	}
-
-	pub fn step(&mut self, t: f32) {
-		let time_since = self.last_hit.elapsed().as_secs_f32();
-		if self.shields != self.outfits.stat_sum().shield_strength {
-			for (_, d, g) in &self.outfits.stat_sum().shield_generators {
-				if time_since >= *d {
-					self.shields += g * t;
-					if self.shields > self.outfits.stat_sum().shield_strength {
-						self.shields = self.outfits.stat_sum().shield_strength;
-						break;
-					}
-				}
-			}
-		}
-	}
-}
diff --git a/crates/gameobject/src/ship/mod.rs b/crates/gameobject/src/ship/mod.rs
new file mode 100644
index 0000000..9f8e1c6
--- /dev/null
+++ b/crates/gameobject/src/ship/mod.rs
@@ -0,0 +1,5 @@
+mod outfitset;
+mod ship;
+
+pub use outfitset::*;
+pub use ship::*;
diff --git a/crates/gameobject/src/ship/outfitset.rs b/crates/gameobject/src/ship/outfitset.rs
new file mode 100644
index 0000000..d614a28
--- /dev/null
+++ b/crates/gameobject/src/ship/outfitset.rs
@@ -0,0 +1,187 @@
+use std::collections::HashMap;
+
+use content::{GunPoint, OutfitHandle, OutfitSpace};
+use galactica_content as content;
+
+/// Possible outcomes when adding an outfit
+pub enum OutfitAddResult {
+	/// An outfit was successfully added
+	Ok,
+
+	/// An outfit could not be added because we don't have enough free space.
+	/// The string tells us what kind of space we need:
+	/// `outfit,` `weapon,` `engine,` etc. Note that these sometimes overlap:
+	/// outfits may need outfit AND weapon space. In these cases, this result
+	/// should name the "most specific" kind of space we lack.
+	NotEnoughSpace(String),
+}
+
+/// Possible outcomes when removing an outfit
+pub enum OutfitRemoveResult {
+	/// This outfit was successfully removed
+	Ok,
+
+	/// This outfit isn't in this set
+	NotExist,
+	// TODO:
+	// This is where we'll add non-removable outfits,
+	// outfits that provide space, etc
+}
+
+/// A simple data class, used to keep track of delayed shield generators
+#[derive(Debug)]
+pub(crate) struct ShieldGenerator {
+	pub outfit: OutfitHandle,
+	pub delay: f32,
+	pub generation: f32,
+}
+
+/// This struct keeps track of a ship's outfit loadout.
+#[derive(Debug)]
+pub struct OutfitSet {
+	/// What outfits does this statsum contain?
+	outfits: HashMap<OutfitHandle, u32>,
+
+	/// Space available in this outfitset.
+	/// set at creation and never changes.
+	total_space: OutfitSpace,
+
+	/// Space used by the outfits in this set.
+	/// This may be negative if certain outfits provide space!
+	used_space: OutfitSpace,
+
+	/// The gun points available in this ship.
+	/// If value is None, this point is free.
+	/// if value is Some, this point is taken.
+	gun_points: HashMap<GunPoint, Option<OutfitHandle>>,
+
+	// Outfit values
+	// This isn't strictly necessary, but we don't want to
+	// re-compute this on each frame.
+	engine_thrust: f32,
+	steer_power: f32,
+	shield_strength: f32,
+
+	// Delay, generation
+	// TODO: struct
+	shield_generators: Vec<ShieldGenerator>,
+}
+
+impl OutfitSet {
+	pub fn new(available_space: OutfitSpace, gun_points: &[GunPoint]) -> Self {
+		Self {
+			outfits: HashMap::new(),
+			total_space: available_space,
+			used_space: OutfitSpace::new(),
+			gun_points: gun_points.iter().map(|x| (x.clone(), None)).collect(),
+
+			engine_thrust: 0.0,
+			steer_power: 0.0,
+			shield_strength: 0.0,
+			shield_generators: Vec::new(),
+		}
+	}
+
+	pub fn add(&mut self, o: &content::Outfit) -> OutfitAddResult {
+		if !(self.total_space - self.used_space).can_contain(&o.space) {
+			return OutfitAddResult::NotEnoughSpace("TODO".to_string());
+		}
+
+		self.used_space += o.space;
+
+		self.engine_thrust += o.engine_thrust;
+		self.steer_power += o.steer_power;
+		self.shield_strength += o.shield_strength;
+		self.shield_generators.push(ShieldGenerator {
+			outfit: o.handle,
+			delay: o.shield_delay,
+			generation: o.shield_generation,
+		});
+
+		return OutfitAddResult::Ok;
+	}
+
+	pub fn remove(&mut self, o: &content::Outfit) -> OutfitRemoveResult {
+		if !self.outfits.contains_key(&o.handle) {
+			return OutfitRemoveResult::NotExist;
+		} else {
+			let n = *self.outfits.get(&o.handle).unwrap();
+			if n == 1u32 {
+				self.outfits.remove(&o.handle);
+			} else {
+				*self.outfits.get_mut(&o.handle).unwrap() -= 1;
+			}
+		}
+
+		self.used_space -= o.space;
+
+		self.engine_thrust -= o.engine_thrust;
+		self.steer_power -= o.steer_power;
+		self.shield_strength -= o.shield_strength;
+
+		{
+			// This index will exist, since we checked the hashmap
+			let index = self
+				.shield_generators
+				.iter()
+				.position(|g| g.outfit == o.handle)
+				.unwrap();
+			self.shield_generators.remove(index);
+		}
+
+		return OutfitRemoveResult::Ok;
+	}
+}
+
+// Simple getters to make sure nobody meddles with our internal state
+impl OutfitSet {
+	/// The number of outfits in this set
+	pub fn len(&self) -> u32 {
+		self.outfits.iter().map(|(_, x)| x).sum()
+	}
+
+	/// Iterate over all outfits
+	pub fn iter_outfits(&self) -> impl Iterator<Item = (&OutfitHandle, &u32)> {
+		self.outfits.iter()
+	}
+
+	/// Iterate over all gun points
+	pub fn iter_gun_points(&self) -> impl Iterator<Item = (&GunPoint, &Option<OutfitHandle>)> {
+		self.gun_points.iter()
+	}
+
+	/// Iterate over all shield generators
+	pub(crate) fn iter_shield_generators(&self) -> impl Iterator<Item = &ShieldGenerator> {
+		self.shield_generators.iter()
+	}
+
+	/// Get maximum possible shield regen
+	pub fn get_max_shield_regen(&self) -> f32 {
+		self.shield_generators.iter().map(|x| x.generation).sum()
+	}
+
+	/// Total available outfit space
+	pub fn get_total_space(&self) -> &OutfitSpace {
+		&self.total_space
+	}
+
+	/// Used outfit space
+	pub fn get_used_space(&self) -> &OutfitSpace {
+		&self.used_space
+	}
+
+	/// Total foward thrust
+	pub fn get_engine_thrust(&self) -> f32 {
+		self.engine_thrust
+	}
+
+	/// Total steer power
+	pub fn get_steer_power(&self) -> f32 {
+		self.steer_power
+	}
+
+	/// Total shield strength
+	pub fn get_shield_strength(&self) -> f32 {
+		self.shield_strength
+	}
+}
diff --git a/crates/gameobject/src/ship/ship.rs b/crates/gameobject/src/ship/ship.rs
new file mode 100644
index 0000000..5f76f08
--- /dev/null
+++ b/crates/gameobject/src/ship/ship.rs
@@ -0,0 +1,79 @@
+use std::time::Instant;
+
+use super::OutfitSet;
+use galactica_content as content;
+
+#[derive(Debug)]
+pub struct Ship {
+	// Metadata values
+	pub ct_handle: content::ShipHandle,
+	pub faction: content::FactionHandle,
+	pub outfits: OutfitSet,
+
+	// State values
+	// TODO: unified ship stats struct, like space
+	pub hull: f32,
+	pub shields: f32,
+
+	// Utility values
+	/// The last time this ship was damaged
+	pub last_hit: Instant,
+}
+
+impl Ship {
+	pub fn new(
+		ct: &content::Content,
+		ct_handle: content::ShipHandle,
+		faction: content::FactionHandle,
+		outfits: OutfitSet,
+	) -> Self {
+		let s = ct.get_ship(ct_handle);
+		let shields = outfits.get_shield_strength();
+		Ship {
+			ct_handle,
+			faction,
+			outfits,
+			last_hit: Instant::now(),
+
+			// Initial stats
+			hull: s.hull,
+			shields,
+		}
+	}
+
+	/// If this ship is dead, it will be removed from the game.
+	pub fn is_dead(&self) -> bool {
+		self.hull <= 0.0
+	}
+
+	/// Hit this ship with the given amount of damage
+	pub fn apply_damage(&mut self, mut d: f32) {
+		if self.is_dead() {
+			return;
+		}
+		if self.shields >= d {
+			self.shields -= d
+		} else {
+			d -= self.shields;
+			self.shields = 0.0;
+			self.hull = 0f32.max(self.hull - d);
+		}
+		self.last_hit = Instant::now();
+	}
+
+	/// Update this ship's state by `t` seconds
+	pub fn step(&mut self, t: f32) {
+		let time_since = self.last_hit.elapsed().as_secs_f32();
+		if self.shields != self.outfits.get_shield_strength() {
+			for g in self.outfits.iter_shield_generators() {
+				if time_since >= g.delay {
+					self.shields += g.generation * t;
+					if self.shields > self.outfits.get_shield_strength() {
+						self.shields = self.outfits.get_shield_strength();
+						break;
+					}
+				}
+			}
+		}
+	}
+}
diff --git a/crates/gameobject/src/system.rs b/crates/gameobject/src/system.rs
index 10ffebb..08348b2 100644
--- a/crates/gameobject/src/system.rs
+++ b/crates/gameobject/src/system.rs
@@ -1,6 +1,8 @@
-use crate::SystemObject;
+use cgmath::{Point3, Rad};
 use galactica_content as content;
 
+// TODO: rework
+
 pub struct System {
 	pub name: String,
 	pub bodies: Vec<SystemObject>,
@@ -25,8 +27,11 @@ impl System {
 
 		return s;
 	}
-
-	//pub fn get_sprites(&self) -> Vec<ObjectSprite> {
-	//	return self.bodies.iter().map(|x| x.get_sprite()).collect();
-	//}
+}
+
+pub struct SystemObject {
+	pub sprite: content::SpriteHandle,
+	pub pos: Point3<f32>,
+	pub size: f32,
+	pub angle: Rad<f32>,
 }
diff --git a/crates/gameobject/src/systemobject.rs b/crates/gameobject/src/systemobject.rs
deleted file mode 100644
index 5415f57..0000000
--- a/crates/gameobject/src/systemobject.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-use cgmath::{Point3, Rad};
-
-use galactica_content as content;
-
-pub struct SystemObject {
-	pub sprite: content::SpriteHandle,
-	pub pos: Point3<f32>,
-	pub size: f32,
-	pub angle: Rad<f32>,
-}