Multiples camera with RenderLayers doesn't work with Msaa::Off (solved ?)

[mirsella]

Bevy version

0.14.2

[Optional] Relevant system information

archlinux wayland kde
AdapterInfo { name: "AMD Radeon RX 7800 XT (RADV NAVI32)", vendor: 4098, device: 29822, device_type: DiscreteGpu, driver: "radv", driver_info: "Mesa 24.2.3-arch1.1", backend: Vulkan }

What you did

i have a game with a bevy ui grid, and i wanted to draw gizmo on it. It was quite hard as the documentation is hard to find.
Based off #13027 i tried the example given with 2 cameras and render layer, which works with little modification, but not on my game, the gizmo are drawing but not the ui.
after hours of pain trying different things, i found it was when i had app.insert_resource(Msaa::Off) that the ui didn't show.

use bevy::{
    color::palettes::css::{MIDNIGHT_BLUE, RED, YELLOW},
    prelude::*,
    render::view::RenderLayers,
};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .insert_gizmo_config(
            DefaultGizmoConfigGroup,
            GizmoConfig {
                render_layers: RenderLayers::layer(1),
                ..default()
            },
        )
        // .insert_resource(Msaa::Off)
        .add_systems(Startup, setup)
        .add_systems(Update, gizmos)
        .run();
}

fn setup(mut commands: Commands) {
    // "Bottom" camera
    let camera0 = commands.spawn(Camera2dBundle::default()).id();

    // "Top" camera
    let mut camera2 = Camera2dBundle::default();
    camera2.camera.order = 1;
    commands.spawn((camera2, RenderLayers::layer(1)));

    commands.spawn((
        ImageBundle {
            style: Style {
                width: Val::Percent(100.0),
                height: Val::Percent(100.0),
                ..default()
            },
            image: UiImage::solid_color(MIDNIGHT_BLUE.into()),
            ..default()
        },
        // use the default first camera for ui
        TargetCamera(camera0),
    ));
}

fn gizmos(mut gizmos: Gizmos) {
    gizmos.line_2d(Vec2::new(-25.0, 25.0), Vec2::new(25.0, 25.0), RED);
    gizmos.line_2d(Vec2::new(0.0, 0.0), Vec2::new(0.0, 50.0), YELLOW);
}

What went wrong

The gizmos are drawn, but the ui is invisible, not shown.
You can test this by un commenting the insert msaa off line in main.

thanks !

[mirsella]

the problem was fixed by setting clear_color = ClearColorConfig::None on camera2.
i don't know how I am supposed to learn about this by myself without taking time of people on discord ?

ill leave this open as it seems to be a weird behavior that msaa 1 sample the clearconfig isn't needed and with the default 4 its needed ? if there isn't anything abnormal, feel free to close this issue, my problem is solved anyway.

thanks

[mirsella]

seems to work on bevy 0.16 now

use bevy::{
    color::palettes::css::{MIDNIGHT_BLUE, RED, YELLOW},
    prelude::*,
    render::view::RenderLayers,
};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .insert_gizmo_config(
            DefaultGizmoConfigGroup,
            GizmoConfig {
                render_layers: RenderLayers::layer(1),
                ..default()
            },
        )
        .add_systems(Startup, setup)
        .add_systems(Update, gizmos)
        .run();
}

fn setup(mut commands: Commands) {
    // "Bottom" camera
    commands.spawn((Camera2d, IsDefaultUiCamera, Msaa::Off));

    // "Top" camera
    commands.spawn((
        Msaa::Off,
        Camera {
            order: 1,
            clear_color: ClearColorConfig::None,
            ..default()
        },
        Camera2d,
        RenderLayers::layer(1),
    ));

    commands.spawn((
        Node {
            width: Val::Percent(100.0),
            height: Val::Percent(100.0),
            ..default()
        },
        ImageNode {
            color: MIDNIGHT_BLUE.into(),
            ..default()
        },
    ));
}

fn gizmos(mut gizmos: Gizmos) {
    gizmos.line_2d(Vec2::new(-25.0, 25.0), Vec2::new(25.0, 25.0), RED);
    gizmos.line_2d(Vec2::new(0.0, 0.0), Vec2::new(0.0, 50.0), YELLOW);
}