hot_asset_reloading/
hot_asset_reloading.rs

1//! Hot reloading allows you to modify assets files to be immediately reloaded while your game is
2//! running. This lets you immediately see the results of your changes without restarting the game.
3//! This example illustrates hot reloading mesh changes.
4//!
5//! Note that hot asset reloading requires the [`AssetWatcher`](bevy::asset::io::AssetWatcher) to be enabled
6//! for your current platform. For desktop platforms, enable the `file_watcher` cargo feature.
7
8use bevy::prelude::*;
9
10fn main() {
11    App::new()
12        .add_plugins(DefaultPlugins)
13        .add_systems(Startup, setup)
14        .run();
15}
16
17fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
18    // Load our mesh:
19    let scene_handle =
20        asset_server.load(GltfAssetLabel::Scene(0).from_asset("models/torus/torus.gltf"));
21
22    // Any changes to the mesh will be reloaded automatically! Try making a change to torus.gltf.
23    // You should see the changes immediately show up in your app.
24
25    // mesh
26    commands.spawn(SceneRoot(scene_handle));
27    // light
28    commands.spawn((
29        DirectionalLight::default(),
30        Transform::from_xyz(4.0, 5.0, 4.0).looking_at(Vec3::ZERO, Vec3::Y),
31    ));
32    // camera
33    commands.spawn((
34        Camera3d::default(),
35        Transform::from_xyz(2.0, 2.0, 6.0).looking_at(Vec3::ZERO, Vec3::Y),
36    ));
37}