bevy_lit is a simple and easy-to-use 2D lighting library for Bevy, designed to work seamlessly with a single camera setup. The library provides basic lighting functionalities through the types: AmbientLight2d, LightOccluder2d, and PointLight2d.
- AmbientLight2d: Provides a general light source that illuminates the entire scene uniformly.
- LightOccluder2d: Creates shadows and blocks light from
PointLight2d. - PointLight2d: Emits light from a specific point, simulating light sources like lamps or torches.
Please note that bevy_lit is in an early development stage. Users will find bugs and incomplete features. Additionally, the documentation is currently lacking. I appreciate any feedback and contributions to help improve the library.
To use it, you can clone the repository directly from GitHub - if you want to fine tune the library to your needs. Or add it to your Cargo.lock:
[dependencies]
bevy_lit = "0.1"cargo run --example basicBelow is a basic example demonstrating how to set up and use bevy_lit in your Bevy project:
use bevy::prelude::*;
use bevy_lit::prelude::*;
fn main() {
App::new()
.add_plugins((
DefaultPlugins,
Lighting2dPlugin {
ambient_light: AmbientLight2d {
brightness: 0.2,
color: Color::Srgba(Srgba::hex("#C09AFE").unwrap()),
},
shadow_softness: 32.0,
},
))
.add_systems(Startup, setup)
.run();
}
fn setup(mut commands: Commands) {
commands.spawn(Camera2dBundle::default());
commands.spawn(PointLight2dBundle {
point_light: PointLight2d {
color: Color::rgb(1.0, 1.0, 1.0),
intensity: 3.0,
radius: 200.0,
falloff: 2.0,
},
..default()
});
commands.spawn(LightOccluder2dBundle {
light_occluder: LightOccluder2d::new(Vec2::new(50.0, 50.0)),
transform: Transform::from_xyz(0.0, 200.0, 0.0),
..default()
});
}bevy_lit uses signed distance fields (SDFs) to compute the occluders' distances. To soften the shadows, a blur is applied. This approach is not ideal and might have limitations in terms of performance and visual accuracy, but it provides a starting point for basic 2D lighting effects.
This library took heavy inspiration from the work of other developers. I learned a lot about lighting and Bevy development by reading the source code of the following crates:
Contributions are welcome! Please open an issue or submit a pull request.
bevy_lit is licensed under the MIT License. See LICENSE for more details.
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