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bevy/examples/3d/lighting.rs
Carter Anderson 015f2c69ca
Merge Style properties into Node. Use ComputedNode for computed properties. ()
# Objective

Continue improving the user experience of our UI Node API in the
direction specified by [Bevy's Next Generation Scene / UI
System](https://github.com/bevyengine/bevy/discussions/14437)

## Solution

As specified in the document above, merge `Style` fields into `Node`,
and move "computed Node fields" into `ComputedNode` (I chose this name
over something like `ComputedNodeLayout` because it currently contains
more than just layout info. If we want to break this up / rename these
concepts, lets do that in a separate PR). `Style` has been removed.

This accomplishes a number of goals:

## Ergonomics wins

Specifying both `Node` and `Style` is now no longer required for
non-default styles

Before:
```rust
commands.spawn((
    Node::default(),
    Style {
        width:  Val::Px(100.),
        ..default()
    },
));
```

After:

```rust
commands.spawn(Node {
    width:  Val::Px(100.),
    ..default()
});
```

## Conceptual clarity

`Style` was never a comprehensive "style sheet". It only defined "core"
style properties that all `Nodes` shared. Any "styled property" that
couldn't fit that mold had to be in a separate component. A "real" style
system would style properties _across_ components (`Node`, `Button`,
etc). We have plans to build a true style system (see the doc linked
above).

By moving the `Style` fields to `Node`, we fully embrace `Node` as the
driving concept and remove the "style system" confusion.

## Next Steps

* Consider identifying and splitting out "style properties that aren't
core to Node". This should not happen for Bevy 0.15.

---

## Migration Guide

Move any fields set on `Style` into `Node` and replace all `Style`
component usage with `Node`.

Before:
```rust
commands.spawn((
    Node::default(),
    Style {
        width:  Val::Px(100.),
        ..default()
    },
));
```

After:

```rust
commands.spawn(Node {
    width:  Val::Px(100.),
    ..default()
});
```

For any usage of the "computed node properties" that used to live on
`Node`, use `ComputedNode` instead:

Before:
```rust
fn system(nodes: Query<&Node>) {
    for node in &nodes {
        let computed_size = node.size();
    }
}
```

After:
```rust
fn system(computed_nodes: Query<&ComputedNode>) {
    for computed_node in &computed_nodes {
        let computed_size = computed_node.size();
    }
}
```
2024-10-18 22:25:33 +00:00

322 lines
9.9 KiB
Rust

//! Illustrates different lights of various types and colors, some static, some moving over
//! a simple scene.
use std::f32::consts::PI;
use bevy::{
color::palettes::css::*,
pbr::CascadeShadowConfigBuilder,
prelude::*,
render::camera::{Exposure, PhysicalCameraParameters},
};
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.insert_resource(Parameters(PhysicalCameraParameters {
aperture_f_stops: 1.0,
shutter_speed_s: 1.0 / 125.0,
sensitivity_iso: 100.0,
sensor_height: 0.01866,
}))
.add_systems(Startup, setup)
.add_systems(Update, (update_exposure, movement, animate_light_direction))
.run();
}
#[derive(Resource, Default, Deref, DerefMut)]
struct Parameters(PhysicalCameraParameters);
#[derive(Component)]
struct Movable;
/// set up a simple 3D scene
fn setup(
parameters: Res<Parameters>,
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
asset_server: Res<AssetServer>,
) {
// ground plane
commands.spawn((
Mesh3d(meshes.add(Plane3d::default().mesh().size(10.0, 10.0))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: Color::WHITE,
perceptual_roughness: 1.0,
..default()
})),
));
// left wall
let mut transform = Transform::from_xyz(2.5, 2.5, 0.0);
transform.rotate_z(PI / 2.);
commands.spawn((
Mesh3d(meshes.add(Cuboid::new(5.0, 0.15, 5.0))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: INDIGO.into(),
perceptual_roughness: 1.0,
..default()
})),
transform,
));
// back (right) wall
let mut transform = Transform::from_xyz(0.0, 2.5, -2.5);
transform.rotate_x(PI / 2.);
commands.spawn((
Mesh3d(meshes.add(Cuboid::new(5.0, 0.15, 5.0))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: INDIGO.into(),
perceptual_roughness: 1.0,
..default()
})),
transform,
));
// Bevy logo to demonstrate alpha mask shadows
let mut transform = Transform::from_xyz(-2.2, 0.5, 1.0);
transform.rotate_y(PI / 8.);
commands.spawn((
Mesh3d(meshes.add(Rectangle::new(2.0, 0.5))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color_texture: Some(asset_server.load("branding/bevy_logo_light.png")),
perceptual_roughness: 1.0,
alpha_mode: AlphaMode::Mask(0.5),
cull_mode: None,
..default()
})),
transform,
Movable,
));
// cube
commands.spawn((
Mesh3d(meshes.add(Cuboid::default())),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: DEEP_PINK.into(),
..default()
})),
Transform::from_xyz(0.0, 0.5, 0.0),
Movable,
));
// sphere
commands.spawn((
Mesh3d(meshes.add(Sphere::new(0.5).mesh().uv(32, 18))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: LIMEGREEN.into(),
..default()
})),
Transform::from_xyz(1.5, 1.0, 1.5),
Movable,
));
// ambient light
commands.insert_resource(AmbientLight {
color: ORANGE_RED.into(),
brightness: 0.02,
});
// red point light
commands
.spawn((
PointLight {
intensity: 100_000.0,
color: RED.into(),
shadows_enabled: true,
..default()
},
Transform::from_xyz(1.0, 2.0, 0.0),
))
.with_children(|builder| {
builder.spawn((
Mesh3d(meshes.add(Sphere::new(0.1).mesh().uv(32, 18))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: RED.into(),
emissive: LinearRgba::new(4.0, 0.0, 0.0, 0.0),
..default()
})),
));
});
// green spot light
commands
.spawn((
SpotLight {
intensity: 100_000.0,
color: LIME.into(),
shadows_enabled: true,
inner_angle: 0.6,
outer_angle: 0.8,
..default()
},
Transform::from_xyz(-1.0, 2.0, 0.0).looking_at(Vec3::new(-1.0, 0.0, 0.0), Vec3::Z),
))
.with_child((
Mesh3d(meshes.add(Capsule3d::new(0.1, 0.125))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: LIME.into(),
emissive: LinearRgba::new(0.0, 4.0, 0.0, 0.0),
..default()
})),
Transform::from_rotation(Quat::from_rotation_x(PI / 2.0)),
));
// blue point light
commands
.spawn((
PointLight {
intensity: 100_000.0,
color: BLUE.into(),
shadows_enabled: true,
..default()
},
Transform::from_xyz(0.0, 4.0, 0.0),
))
.with_children(|builder| {
builder.spawn((
Mesh3d(meshes.add(Sphere::new(0.1).mesh().uv(32, 18))),
MeshMaterial3d(materials.add(StandardMaterial {
base_color: BLUE.into(),
emissive: LinearRgba::new(0.0, 0.0, 713.0, 0.0),
..default()
})),
));
});
// directional 'sun' light
commands.spawn((
DirectionalLight {
illuminance: light_consts::lux::OVERCAST_DAY,
shadows_enabled: true,
..default()
},
Transform {
translation: Vec3::new(0.0, 2.0, 0.0),
rotation: Quat::from_rotation_x(-PI / 4.),
..default()
},
// The default cascade config is designed to handle large scenes.
// As this example has a much smaller world, we can tighten the shadow
// bounds for better visual quality.
CascadeShadowConfigBuilder {
first_cascade_far_bound: 4.0,
maximum_distance: 10.0,
..default()
}
.build(),
));
// example instructions
commands
.spawn((
Text::default(),
Node {
position_type: PositionType::Absolute,
top: Val::Px(12.0),
left: Val::Px(12.0),
..default()
},
))
.with_children(|p| {
p.spawn(TextSpan(format!(
"Aperture: f/{:.0}\n",
parameters.aperture_f_stops,
)));
p.spawn(TextSpan(format!(
"Shutter speed: 1/{:.0}s\n",
1.0 / parameters.shutter_speed_s
)));
p.spawn(TextSpan(format!(
"Sensitivity: ISO {:.0}\n",
parameters.sensitivity_iso
)));
p.spawn(TextSpan::new("\n\n"));
p.spawn(TextSpan::new("Controls\n"));
p.spawn(TextSpan::new("---------------\n"));
p.spawn(TextSpan::new("Arrow keys - Move objects\n"));
p.spawn(TextSpan::new("1/2 - Decrease/Increase aperture\n"));
p.spawn(TextSpan::new("Arrow keys - Move objects\n"));
p.spawn(TextSpan::new("3/4 - Decrease/Increase shutter speed\n"));
p.spawn(TextSpan::new("5/6 - Decrease/Increase sensitivity\n"));
p.spawn(TextSpan::new("R - Reset exposure"));
});
// camera
commands.spawn((
Camera3d::default(),
Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
Exposure::from_physical_camera(**parameters),
));
}
fn update_exposure(
key_input: Res<ButtonInput<KeyCode>>,
mut parameters: ResMut<Parameters>,
mut exposure: Single<&mut Exposure>,
text: Single<Entity, With<Text>>,
mut writer: TextUiWriter,
) {
// TODO: Clamp values to a reasonable range
let entity = *text;
if key_input.just_pressed(KeyCode::Digit2) {
parameters.aperture_f_stops *= 2.0;
} else if key_input.just_pressed(KeyCode::Digit1) {
parameters.aperture_f_stops *= 0.5;
}
if key_input.just_pressed(KeyCode::Digit4) {
parameters.shutter_speed_s *= 2.0;
} else if key_input.just_pressed(KeyCode::Digit3) {
parameters.shutter_speed_s *= 0.5;
}
if key_input.just_pressed(KeyCode::Digit6) {
parameters.sensitivity_iso += 100.0;
} else if key_input.just_pressed(KeyCode::Digit5) {
parameters.sensitivity_iso -= 100.0;
}
if key_input.just_pressed(KeyCode::KeyR) {
*parameters = Parameters::default();
}
*writer.text(entity, 1) = format!("Aperture: f/{:.0}\n", parameters.aperture_f_stops);
*writer.text(entity, 2) = format!(
"Shutter speed: 1/{:.0}s\n",
1.0 / parameters.shutter_speed_s
);
*writer.text(entity, 3) = format!("Sensitivity: ISO {:.0}\n", parameters.sensitivity_iso);
**exposure = Exposure::from_physical_camera(**parameters);
}
fn animate_light_direction(
time: Res<Time>,
mut query: Query<&mut Transform, With<DirectionalLight>>,
) {
for mut transform in &mut query {
transform.rotate_y(time.delta_secs() * 0.5);
}
}
fn movement(
input: Res<ButtonInput<KeyCode>>,
time: Res<Time>,
mut query: Query<&mut Transform, With<Movable>>,
) {
for mut transform in &mut query {
let mut direction = Vec3::ZERO;
if input.pressed(KeyCode::ArrowUp) {
direction.y += 1.0;
}
if input.pressed(KeyCode::ArrowDown) {
direction.y -= 1.0;
}
if input.pressed(KeyCode::ArrowLeft) {
direction.x -= 1.0;
}
if input.pressed(KeyCode::ArrowRight) {
direction.x += 1.0;
}
transform.translation += time.delta_secs() * 2.0 * direction;
}
}