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Basics for the multi_window_camera_ui example

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Tero Laxström 2025-03-13 11:08:44 +02:00
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11
Cargo.toml
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@ -3540,6 +3540,17 @@ description = "Demonstrates creating multiple windows, and rendering to them"
category = "Window" category = "Window"
wasm = false wasm = false
[[example]]
name = "multi_window_camera_ui"
path = "examples/window/multi_window_camera_ui.rs"
doc-scrape-examples = true
[package.metadata.example.multi_window_camera_ui]
name = "Multi-Window Camera UI"
description = "Demonstrates creating multiple windows with multiple cameras with different UIs"
category = "Window"
wasm = false
[[example]] [[example]]
name = "scale_factor_override" name = "scale_factor_override"
path = "examples/window/scale_factor_override.rs" path = "examples/window/scale_factor_override.rs"

217
examples/window/multi_window_camera_ui.rs Normal file
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@ -0,0 +1,217 @@
//! Uses two windows to visualize a 3D model from different angles.
use bevy::color::palettes::css::{DEEP_SKY_BLUE, LIGHT_SKY_BLUE, YELLOW};
use bevy::{prelude::*, render::camera::RenderTarget, window::WindowRef};
fn main() {
App::new()
// By default, a primary window gets spawned by `WindowPlugin`, contained in `DefaultPlugins`
.add_plugins(DefaultPlugins)
.add_systems(Startup, setup_scene)
.run();
}
fn setup_scene(mut commands: Commands, asset_server: Res<AssetServer>) {
// add entities to the world
commands.spawn(SceneRoot(
asset_server.load(GltfAssetLabel::Scene(0).from_asset("models/torus/torus.gltf")),
));
// light
commands.spawn((
DirectionalLight::default(),
Transform::from_xyz(3.0, 3.0, 3.0).looking_at(Vec3::ZERO, Vec3::Y),
));
let first_window_camera = commands
.spawn((
Camera3d::default(),
Transform::from_xyz(0.0, 0.0, 6.0).looking_at(Vec3::ZERO, Vec3::Y),
))
.id();
// Spawn a second window
let second_window = commands
.spawn(Window {
title: "Second window".to_owned(),
..default()
})
.id();
let second_window_camera = commands
.spawn((
Camera3d::default(),
Transform::from_xyz(6.0, 0.0, 0.0).looking_at(Vec3::ZERO, Vec3::Y),
Camera {
target: RenderTarget::Window(WindowRef::Entity(second_window)),
..default()
},
))
.id();
let example_nodes = [
(1., BorderRadius::all(Val::Px(20.))),
(2., BorderRadius::MAX),
(3., BorderRadius::all(Val::Px(20.))),
(4., BorderRadius::MAX),
(5., BorderRadius::all(Val::Px(20.))),
];
commands
.spawn((
Node {
flex_direction: FlexDirection::RowReverse,
align_items: AlignItems::Center,
justify_content: JustifyContent::SpaceEvenly,
width: Val::Percent(100.),
height: Val::Percent(11.),
..default()
},
BackgroundColor(Color::srgb(0.25, 0.25, 0.25)),
// Since we are using multiple cameras, we need to specify which camera UI should be rendered to
UiTargetCamera(first_window_camera),
))
.with_children(|commands| {
for (blur, border_radius) in example_nodes {
commands.spawn(box_shadow_node_bundle(blur, border_radius));
}
});
let first_font_handle = asset_server.load("fonts/FiraSans-Bold.ttf");
commands
.spawn((
Node {
position_type: PositionType::Absolute,
bottom: Val::ZERO,
left: Val::Px(200.),
width: Val::Px(100.),
..default()
},
BackgroundColor(Color::from(DEEP_SKY_BLUE)),
UiTargetCamera(first_window_camera),
))
.with_children(|command| {
command.spawn((
Text::new("First window"),
TextFont {
font: first_font_handle.clone(),
font_size: 50.0,
..default()
},
TextColor(YELLOW.into()),
));
});
commands
.spawn((
Node {
position_type: PositionType::Absolute,
bottom: Val::ZERO,
left: Val::Px(500.),
width: Val::Px(100.),
overflow: Overflow::hidden(),
..default()
},
BackgroundColor(Color::from(DEEP_SKY_BLUE)),
UiTargetCamera(first_window_camera),
))
.with_children(|command| {
command.spawn((
Text::new("xxxxxxx"),
TextFont {
font: first_font_handle.clone(),
font_size: 50.0,
..default()
},
TextColor(YELLOW.into()),
));
});
commands
.spawn((
Node {
flex_direction: FlexDirection::Column,
align_items: AlignItems::Center,
justify_content: JustifyContent::SpaceEvenly,
width: Val::Percent(7.),
height: Val::Percent(100.),
..default()
},
BackgroundColor(Color::srgb(0.25, 0.25, 0.25)),
// Since we are using multiple cameras, we need to specify which camera UI should be rendered to
UiTargetCamera(second_window_camera),
))
.with_children(|commands| {
for (blur, border_radius) in example_nodes {
commands.spawn(box_shadow_node_bundle(blur, border_radius));
}
});
let second_font_handle = asset_server.load("fonts/FiraMono-Medium.ttf");
commands
.spawn((
Node {
position_type: PositionType::Absolute,
bottom: Val::ZERO,
left: Val::Px(200.),
width: Val::Px(100.),
..default()
},
BackgroundColor(Color::from(DEEP_SKY_BLUE)),
UiTargetCamera(second_window_camera),
))
.with_children(|command| {
command.spawn((
Text::new("Second window"),
TextFont {
font: second_font_handle.clone(),
font_size: 50.0,
..default()
},
TextColor(YELLOW.into()),
));
});
commands
.spawn((
Node {
position_type: PositionType::Absolute,
bottom: Val::ZERO,
left: Val::Px(500.),
width: Val::Px(100.),
overflow: Overflow::hidden(),
..default()
},
BackgroundColor(Color::from(DEEP_SKY_BLUE)),
UiTargetCamera(second_window_camera),
))
.with_children(|command| {
command.spawn((
Text::new("xxxxxxx"),
TextFont {
font: second_font_handle.clone(),
font_size: 50.0,
..default()
},
TextColor(YELLOW.into()),
));
});
}
fn box_shadow_node_bundle(blur: f32, border_radius: BorderRadius) -> impl Bundle {
(
Node {
width: Val::Px(50.),
height: Val::Px(50.),
border: UiRect::all(Val::Px(4.)),
..default()
},
BorderColor(LIGHT_SKY_BLUE.into()),
border_radius,
BackgroundColor(DEEP_SKY_BLUE.into()),
BoxShadow::new(
Color::BLACK.with_alpha(0.8),
Val::Percent(10.),
Val::Percent(10.),
Val::Percent(10.),
Val::Px(blur),
),
)
}