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https://github.com/tbillington/bevy_toon_shader

Toon Shader for the bevy game engine
https://github.com/tbillington/bevy_toon_shader

3d-graphics asset bevy game-assets game-development graphics rust shader

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Toon Shader for the bevy game engine

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# Bevy Toon Shader

[![Crates.io](https://img.shields.io/crates/v/bevy_toon_shader)](https://crates.io/crates/bevy_toon_shader)
[![MIT/Apache 2.0](https://img.shields.io/badge/license-MIT%2FApache-blue.svg)](https://github.com/tbillington/bevy_toon_shader#license)

A [toon shader](https://en.wikipedia.org/wiki/Cel_shading) for the [Bevy](https://github.com/bevyengine/bevy/) game engine.

bevy_toon_shader

**Features**
- "Sun" color & direction
- Specular highlight
- Light banding
- Shadow casting
- Albedo map (base color texture)

**Not supported (yet)**
- Dynamic color banding amount
- Shadow receiving
- Rim lighting

## Installation

```sh
cargo add bevy_toon_shader
```

```rust
use bevy::prelude::*;
use bevy_toon_shader::{ToonShaderMainCamera, ToonShaderMaterial, ToonShaderPlugin, ToonShaderSun};

fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_plugin(ToonShaderPlugin)
.add_systems(Startup, setup)
.run();
}

fn setup(
mut commands: Commands,
mut meshes: ResMut>,
mut toon_materials: ResMut>,
) {
// Camera
commands.spawn((
Camera3dBundle { /* ... */ },
ToonShaderMainCamera,
));

// Sun
commands.spawn((
DirectionalLightBundle { /* ... */ },
ToonShaderSun,
));

// Ambient light
commands.insert_resource(AmbientLight {
color: Color::GRAY * 0.2,
..default()
});

let material = toon_materials.add(ToonShaderMaterial::default());

// 3D object
commands.spawn(MaterialMeshBundle {
mesh: meshes.add(Mesh::try_from(shape::Torus::default()).unwrap()),
transform: Transform::from_xyz(0., 2., 0.),
material: toon_material,
..default()
});
}
```

## Running the example

```sh
git clone https://github.com/tbillington/bevy_toon_shader.git
cd bevy_toon_shader
cargo run --example scene
```

## Bevy Support Table

| bevy | bevy_toon_shader |
| -- | -- |
| 0.12 | 0.3 |
| 0.11 | 0.2 |
| 0.10 | 0.1 |

## Credit

Code initially adapted from this [excellent Unity tutorial](https://roystan.net/articles/toon-shader/) by Roystan.

## License

Except where noted, all code in this repository is dual-licensed under either:

* MIT License ([LICENSE-MIT](LICENSE-MIT) or [http://opensource.org/licenses/MIT](http://opensource.org/licenses/MIT))
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or [http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0))

at your option.
This means you can select the license you prefer!
This dual-licensing approach is the de-facto standard in the Rust ecosystem and there are [very good reasons](https://github.com/bevyengine/bevy/issues/2373) to include both.

### Your contributions

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.