bevy 0.9.0

A refreshingly simple data-driven game engine and app framework
Documentation 
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//! Showcases wireframe rendering.

use bevy::{
    pbr::wireframe::{Wireframe, WireframeConfig, WireframePlugin},
    prelude::*,
    render::{render_resource::WgpuFeatures, settings::WgpuSettings},
};

fn main() {
    App::new()
        .insert_resource(WgpuSettings {
            features: WgpuFeatures::POLYGON_MODE_LINE,
            ..default()
        })
        .add_plugins(DefaultPlugins)
        .add_plugin(WireframePlugin)
        .add_startup_system(setup)
        .run();
}

/// set up a simple 3D scene
fn setup(
    mut commands: Commands,
    mut wireframe_config: ResMut<WireframeConfig>,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    // To draw the wireframe on all entities, set this to 'true'
    wireframe_config.global = false;
    // plane
    commands.spawn(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
        material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
        ..default()
    });
    // cube
    commands.spawn((
        PbrBundle {
            mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
            material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
            transform: Transform::from_xyz(0.0, 0.5, 0.0),
            ..default()
        },
        // This enables wireframe drawing on this entity
        Wireframe,
    ));
    // light
    commands.spawn(PointLightBundle {
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..default()
    });
    // camera
    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    });
}