ambient_light.md

Ambient Light

There are different kinds of light in Bevy. Ambient light is one of them. It is like sky light. Objects receive the light equally no matter where they are in the 3D scene.

We use resource AmbientLight to create an ambient light.

commands.insert_resource(AmbientLight {
    brightness: 2.,
    ..default()
});

We can change the brightness, which is how bright the light is. The larger the brighter.

We place a Cube at the origin, set our camera position to (2, 1, 3) and make it looking at the origin.

The full code is as follows:

use bevy::{
    app::{App, Startup},
    asset::Assets,
    core_pipeline::core_3d::Camera3dBundle,
    ecs::system::{Commands, ResMut},
    math::Vec3,
    pbr::{AmbientLight, PbrBundle, StandardMaterial},
    render::mesh::{shape::Cube, Mesh},
    transform::components::Transform,
    utils::default,
    DefaultPlugins,
};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(2., 1., 3.).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    });

    commands.spawn(PbrBundle {
        mesh: meshes.add(Cube::new(1.).into()).into(),
        material: materials.add(StandardMaterial::default()).into(),
        ..default()
    });

    commands.insert_resource(AmbientLight {
        brightness: 2.,
        ..default()
    });
}

Result:

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