minimal.rs

use bevy::{prelude::*, window::PresentMode};
use bevy_mod_picking::DefaultPickingPlugins;
use bevy_transform_gizmo::TransformGizmoPlugin;

fn main() {
    App::new()
        .insert_resource(Msaa::Sample4)
        .insert_resource(ClearColor(Color::BLACK))
        .add_plugins((
            DefaultPlugins.set(WindowPlugin {
                primary_window: Some(Window {
                    present_mode: PresentMode::Immediate,
                    ..default()
                }),
                ..default()
            }),
            DefaultPickingPlugins,
            TransformGizmoPlugin::new(
                Quat::from_rotation_y(-0.2), // Align the gizmo to a different coordinate system.
                                             // Use TransformGizmoPlugin::default() to align to the
                                             // scene's coordinate system.
            ),
        ))
        .add_systems(Startup, setup)
        .run();
}

/// set up a simple 3D scene
fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    // plane
    commands.spawn((
        PbrBundle {
            mesh: meshes.add(Plane3d::default()),
            material: materials.add(Color::rgb(0.8, 0.8, 0.8)),
            transform: Transform::from_scale(Vec3::splat(5.0)),
            ..Default::default()
        },
        bevy_mod_picking::PickableBundle::default(),
        bevy_transform_gizmo::GizmoTransformable,
    ));
    // cube
    commands.spawn((
        PbrBundle {
            mesh: meshes.add(Cuboid::from_size(Vec3::splat(1.0))),
            material: materials.add(Color::rgb(0.8, 0.8, 0.8)),
            transform: Transform::from_xyz(0.0, 0.5, 0.0),
            ..Default::default()
        },
        bevy_mod_picking::PickableBundle::default(),
        bevy_transform_gizmo::GizmoTransformable,
    ));
    // light
    commands.spawn(PointLightBundle {
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..Default::default()
    });
    // camera
    commands.spawn((
        Camera3dBundle {
            transform: Transform::from_xyz(2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
            ..Default::default()
        },
        bevy_transform_gizmo::GizmoPickSource::default(),
    ));
}