Beginning work with collision detection

I'm going to grab the Rapier physics library so that I don't have to do
my own collision detection mechanism. The last time I did this, I
simplified everything into circles. This time I'd like to have convex
hulls, particularly for the player ship.

Also the last time, I ended up rolling my own quadtree impl. I'm not
particularly interested in doing that again, and I'd like to learn more
of the broader Bevy ecosystem.

Cargo.toml

@@ -6,4 +6,5 @@ edition = "2024"
 [dependencies]
 bevy = { version = "0.16", features = ["dynamic_linking"] }
 bevy-inspector-egui = "0.32.0"
+bevy_rapier2d = { version = "0.31.0", features = ["debug-render-2d"] }
 rand = "0.9.2"

src/asteroids.rs

@@ -1,3 +1,4 @@
+use bevy_rapier2d::prelude::Collider;
 use rand::{Rng, SeedableRng};
 use std::time::Duration;
 
@@ -107,8 +108,16 @@ pub fn spawn_asteroid(
             AsteroidSize::Medium => game_assets.asteroid_medium(),
             AsteroidSize::Large => game_assets.asteroid_large(),
         };
+
+        let collider_radius = match spawn.size {
+            AsteroidSize::Small => 10.0,
+            AsteroidSize::Medium => 20.0,
+            AsteroidSize::Large => 40.0,
+        };
+
         commands.spawn((
             Asteroid(AsteroidSize::Small),
+            Collider::ball(collider_radius),
             Position(spawn.pos),
             Velocity(spawn.vel),
             Rotation(0.0),

src/lib.rs

@@ -10,6 +10,7 @@ use bevy::prelude::*;
 use bevy_inspector_egui::InspectorOptions;
 use bevy_inspector_egui::prelude::ReflectInspectorOptions;
 
+use bevy_rapier2d::{plugin::{NoUserData, RapierPhysicsPlugin}, prelude::Collider, render::RapierDebugRenderPlugin};
 use config::{ASTEROID_SMALL_COLOR, SHIP_THRUSTER_COLOR_ACTIVE, SHIP_THRUSTER_COLOR_INACTIVE};
 
 pub struct AsteroidPlugin;
@@ -19,6 +20,8 @@ impl Plugin for AsteroidPlugin {
         app.add_plugins((
             title_screen::GameMenuPlugin,
             preparation_widget::preparation_widget_plugin,
+            RapierPhysicsPlugin::<NoUserData>::pixels_per_meter(10.0),
+            RapierDebugRenderPlugin::default(),
         ))
         .insert_resource(ClearColor(BACKGROUND_COLOR))
         .insert_resource(WorldSize {
@@ -176,6 +179,7 @@ fn spawn_camera(mut commands: Commands) {
 fn spawn_player(mut commands: Commands, game_assets: Res<GameAssets>) {
     commands
         .spawn((
+            Collider::ball(0.7),
             Ship,
             Wrapping,
             Position(Vec2::default()),