bevy 0.9.0

A refreshingly simple data-driven game engine and app framework
Documentation 
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//! Uses two windows to visualize a 3D model from different angles.

use bevy::{
    prelude::*,
    render::camera::RenderTarget,
    window::{CreateWindow, PresentMode, WindowId},
};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_startup_system(setup)
        .add_system(bevy::window::close_on_esc)
        .run();
}

fn setup(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
    mut create_window_events: EventWriter<CreateWindow>,
) {
    // add entities to the world
    commands.spawn(SceneBundle {
        scene: asset_server.load("models/monkey/Monkey.gltf#Scene0"),
        ..default()
    });
    // light
    commands.spawn(PointLightBundle {
        transform: Transform::from_xyz(4.0, 5.0, 4.0),
        ..default()
    });
    // main camera
    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(0.0, 0.0, 6.0).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    });

    let window_id = WindowId::new();

    // sends out a "CreateWindow" event, which will be received by the windowing backend
    create_window_events.send(CreateWindow {
        id: window_id,
        descriptor: WindowDescriptor {
            width: 800.,
            height: 600.,
            present_mode: PresentMode::AutoNoVsync,
            title: "Second window".to_string(),
            ..default()
        },
    });

    // second window camera
    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(6.0, 0.0, 0.0).looking_at(Vec3::ZERO, Vec3::Y),
        camera: Camera {
            target: RenderTarget::Window(window_id),
            ..default()
        },
        ..default()
    });
}