Assets / Hot Reloading of Assets

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This example is running in WebGL2 and should work in most browsers. You can check the WebGPU examples here.

//! Hot reloading allows you to modify assets files to be immediately reloaded while your game is
//! running. This lets you immediately see the results of your changes without restarting the game.
//! This example illustrates hot reloading mesh changes.

use bevy::{asset::ChangeWatcher, prelude::*, utils::Duration};

fn main() {
        .add_plugins(DefaultPlugins.set(AssetPlugin {
            // Tell the asset server to watch for asset changes on disk:
            watch_for_changes: ChangeWatcher::with_delay(Duration::from_millis(200)),
        .add_systems(Startup, setup)

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    // Load our mesh:
    let scene_handle = asset_server.load("models/monkey/Monkey.gltf#Scene0");

    // Any changes to the mesh will be reloaded automatically! Try making a change to Monkey.gltf.
    // You should see the changes immediately show up in your app.

    // mesh
    commands.spawn(SceneBundle {
        scene: scene_handle,
    // light
    commands.spawn(PointLightBundle {
        transform: Transform::from_xyz(4.0, 5.0, 4.0),
    // camera
    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(2.0, 2.0, 6.0).looking_at(Vec3::ZERO, Vec3::Y),