Load a mesh with bevy_asset_loader 0.12

mesh.rs

// License: Apache-2.0 / MIT

use bevy::prelude::*;
use bevy_asset_loader::prelude::*;

fn main() {
    App::new()
        .add_loading_state(
            LoadingState::new(MyStates::AssetLoading)
                .continue_to_state(MyStates::Next)
                .with_collection::<MyAssets>(),
        )
        .add_state(MyStates::AssetLoading)
        .add_plugins(DefaultPlugins)
        .add_system_set(SystemSet::on_enter(MyStates::Next).with_system(spawn))
        .run();
}

#[derive(AssetCollection)]
struct MyAssets {
    #[asset(path = "combine.glb#Mesh0/Primitive0")]
    test: Handle<Mesh>,
}

fn spawn(
    mut commands: Commands,
    my_assets: Res<MyAssets>,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    // our mesh
    commands.spawn_bundle(PbrBundle {
        mesh: my_assets.test.clone(),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        transform: Transform::from_xyz(0.0, 0.5, 0.0),
        ..default()
    });
    // plane
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
        material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
        ..default()
    });
    // light
    commands.spawn_bundle(PointLightBundle {
        point_light: PointLight {
            intensity: 1500.0,
            shadows_enabled: true,
            ..default()
        },
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..default()
    });
    // camera
    commands.spawn_bundle(Camera3dBundle {
        transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    });
}

#[derive(Clone, Eq, PartialEq, Debug, Hash)]
enum MyStates {
    AssetLoading,
    Next,
}