generalized_atmosphere.md

---

title: "Generalized Atmospheric Scattering Media"
authors: ["@ecoskey"]
pull_requests: [20838]

---

Most of the fields on Atmosphere have been removed in favor of a handle to the new ScatteringMedium asset.

pub struct Atmosphere {
    pub bottom_radius: f32,
    pub top_radius: f32,
    pub ground_albedo: Vec3,
+   pub medium: Handle<ScatteringMedium>,
-   pub rayleigh_density_exp_scale: f32,
-   pub rayleigh_scattering: Vec3,
-   pub mie_density_exp_scale: f32,
-   pub mie_scattering: f32,
-   pub mie_absorption: f32,
-   pub mie_asymmetry: f32,
-   pub ozone_layer_altitude: f32,
-   pub ozone_layer_width: f32,
-   pub ozone_absorption: Vec3,
}

Unfortunately, this means Atmosphere no longer implements Default. Instead, you can still access the default earthlike atmosphere through the EarthlikeAtmosphere resource:

fn setup_camera(
    mut commands: Commands,
    earthlike_atmosphere: Res<EarthlikeAtmosphere>
) {
    commands.spawn((
        Camera3d,
        earthlike_atmosphere.get(),
    ));
}