dc9b486650
# Objective Fix https://github.com/bevyengine/bevy/issues/11577. ## Solution Fix the examples, add a few constants to make setting light values easier, and change the default lighting settings to be more realistic. (Now designed for an overcast day instead of an indoor environment) --- I did not include any example-related changes in here. ## Changelogs (not including breaking changes) ### bevy_pbr - Added `light_consts` module (included in prelude), which contains common lux and lumen values for lights. - Added `AmbientLight::NONE` constant, which is an ambient light with a brightness of 0. - Added non-EV100 variants for `ExposureSettings`'s EV100 constants, which allow easier construction of an `ExposureSettings` from a EV100 constant. ## Breaking changes ### bevy_pbr The several default lighting values were changed: - `PointLight`'s default `intensity` is now `2000.0` - `SpotLight`'s default `intensity` is now `2000.0` - `DirectionalLight`'s default `illuminance` is now `light_consts::lux::OVERCAST_DAY` (`1000.`) - `AmbientLight`'s default `brightness` is now `20.0`
59 lines
1.8 KiB
Rust
59 lines
1.8 KiB
Rust
//! Illustrates how to rotate an object around an axis.
|
|
|
|
use bevy::prelude::*;
|
|
|
|
use std::f32::consts::TAU;
|
|
|
|
// Define a component to designate a rotation speed to an entity.
|
|
#[derive(Component)]
|
|
struct Rotatable {
|
|
speed: f32,
|
|
}
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, rotate_cube)
|
|
.run();
|
|
}
|
|
|
|
fn setup(
|
|
mut commands: Commands,
|
|
mut meshes: ResMut<Assets<Mesh>>,
|
|
mut materials: ResMut<Assets<StandardMaterial>>,
|
|
) {
|
|
// Spawn a cube to rotate.
|
|
commands.spawn((
|
|
PbrBundle {
|
|
mesh: meshes.add(Cuboid::default()),
|
|
material: materials.add(Color::WHITE),
|
|
transform: Transform::from_translation(Vec3::ZERO),
|
|
..default()
|
|
},
|
|
Rotatable { speed: 0.3 },
|
|
));
|
|
|
|
// Spawn a camera looking at the entities to show what's happening in this example.
|
|
commands.spawn(Camera3dBundle {
|
|
transform: Transform::from_xyz(0.0, 10.0, 20.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
..default()
|
|
});
|
|
|
|
// Add a light source so we can see clearly.
|
|
commands.spawn(DirectionalLightBundle {
|
|
transform: Transform::from_xyz(3.0, 3.0, 3.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
..default()
|
|
});
|
|
}
|
|
|
|
// This system will rotate any entity in the scene with a Rotatable component around its y-axis.
|
|
fn rotate_cube(mut cubes: Query<(&mut Transform, &Rotatable)>, timer: Res<Time>) {
|
|
for (mut transform, cube) in &mut cubes {
|
|
// The speed is first multiplied by TAU which is a full rotation (360deg) in radians,
|
|
// and then multiplied by delta_seconds which is the time that passed last frame.
|
|
// In other words. Speed is equal to the amount of rotations per second.
|
|
transform.rotate_y(cube.speed * TAU * timer.delta_seconds());
|
|
}
|
|
}
|