Atmospheric fog bleeds sunlight through all objects

[atlv24]

Bevy version and features

• 0.17, main.

What went wrong

Atmospheric fog bleeds sunlight through all objects.

Repro:

use bevy::{
    camera_controller::free_camera::{FreeCamera, FreeCameraPlugin},
    light::CascadeShadowConfigBuilder,
    prelude::*,
};

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

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
    asset_server: Res<AssetServer>,
) {
    commands.spawn((
        DirectionalLight {
            color: Color::srgb(0.98, 0.95, 0.82),
            shadows_enabled: true,
            ..default()
        },
        Transform::IDENTITY.looking_at(Vec3::new(-0.15, -0.05, 0.25), Vec3::Y),
        CascadeShadowConfigBuilder {
            first_cascade_far_bound: 1.0,
            maximum_distance: 10.0,
            ..default()
        }
        .build(),
    ));

    commands.spawn((
        Camera3d::default(),
        FreeCamera::default(),
        Transform::from_xyz(0.0, 5.0, 0.0),
        DistanceFog {
            color: Color::srgba(0.35, 0.48, 0.66, 1.0),
            directional_light_color: Color::srgba(1.0, 0.95, 0.85, 0.5),
            directional_light_exponent: 30.0,
            falloff: FogFalloff::from_visibility_colors(
                15.0,
                Color::srgb(0.35, 0.5, 0.66),
                Color::srgb(0.8, 0.844, 1.0),
            ),
        },
    ));

    commands.spawn(SceneRoot(asset_server.load(
        GltfAssetLabel::Scene(0).from_asset("models/VolumetricFogExample/VolumetricFogExample.glb"),
    )));
}

[mate-h]

models/VolumetricFogExample/VolumetricFogExample.glb has a directional light which needs shadows enabled flag similar to the volumetric fog example.

fn tweak_scene(
    mut lights: Query<(Entity, &mut DirectionalLight), Changed<DirectionalLight>>,
) {
    for (light, mut directional_light) in lights.iter_mut() {
        directional_light.shadows_enabled = true;
    }
}