Bevy Game Engine Explained Visually | AIBodh
Bevy Game Engine<br>Bevy Game Engine Explained Visually<br>A visual tour of how Bevy helps you compose complex, emergent games from small independent systems and a data-driven architecture.<br>scroll to explore ↓
Build your game by composing systems
In Bevy, you build small independent systems and orchestrate them into complex emergent behaviors.
main.rs
App::new()<br>.add_plugins(DefaultPlugins)<br>.add_systems(Startup, spawn_player)<br>.add_systems(Startup, spawn_enemies)<br>.add_systems(Update, fire_bullet)<br>.add_systems(Update, check_collisions)<br>.run()
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Chapter 1 — Let There Be a Player
Direct your systems with Bevy's scheduler
Unlike traditional game loops that run everything every frame with if-checks scattered through your code, Bevy's scheduler decouples when a system runs.
main.rs
App::new()<br>.add_systems(OnEnter(Playing), setup)<br>.add_systems(Update, enemy_shoot<br>.run_if(player_is_alive))<br>.add_systems(OnExit(Playing), despawn_all)<br>.add_systems(OnEnter(GameOver), game_over)<br>.run()
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Chapter 4 — Let There Be Collisions
Build your game actors by composing data
Your player is a collection of data. Health, Score are plain Rust structs. Attach them to a player, an enemy, a destructible wall. The same building blocks compose any actor in your game.
main.rs
#[derive(Component)]<br>struct Health(f32);<br>#[derive(Component)]<br>struct Score(u32);<br>commands.spawn((<br>Player,<br>Health(100.),<br>Score(0),<br>));
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Chapter 7 — Let There Be Enemies
Query your game world like a database
Your game world is a database. Every actor/entity is a row, every component is a column. No more manually passing data between systems. You declare what you need, Bevy queries the world and returns every match.
system.rs
fn track_hit_player(<br>mut players: Querymut Health>,<br>enemies: QueryTransform>,<br>) {<br>dodge(&enemies);<br>shoot(&enemies, &mut players);
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Chapter 1 — Let There Be a Player
Trigger chain reactions across systems
Fire one event and Bevy broadcasts it to every system that listens. A bullet lands, health drops, score updates, sound plays, particles spawn. One signal, and the whole game responds.
events.rs
fn on_hit(<br>event: OnHitEvent>,<br>mut q: Querymut Health>,<br>) {<br>apply_damage(event, q);
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Make impossible states impossible
Rust enums make impossible states impossible. Only one variant can be active at a time, and the type system enforces it. Patrolling while attacking simply doesn't compile. A whole class of bugs disappears.
Chapter 4 — Let There Be Collisions
SCALE YOUR GAME WITH PLUGINS
As systems pile up, things get tangled fast. Plugins help organize the chaos, with each one acting as a self-contained module with its own systems, resources, and run conditions.
PARALLEL BY DEFAULT
Every system's parameters declare what it reads and writes. Bevy reads them and spreads systems across your cores. Two systems writing the same resource forces one to wait. Touching different data, they run in parallel.
And more…
Bevy ships with everything from rendering pipelines to audio entities. The ecosystem keeps growing.
Hands-on Bevy Tutorials
Build a 2D game from scratch
Start by setting up a player and watch it move. Build a procedurally generated world. Add collisions, inventory, and particle effects. Give enemies pathfinding, implement health and damage, layer in sound effects, save game states, and implement multiplayer networking.
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