1#define_import_path bevy_pbr::atmosphere::types
2
3struct Atmosphere {
4    // Radius of the planet
5    bottom_radius: f32, // units: m
6
7    // Radius at which we consider the atmosphere to 'end' for out calculations (from center of planet)
8    top_radius: f32, // units: m
9
10    ground_albedo: vec3<f32>,
11
12    rayleigh_density_exp_scale: f32,
13    rayleigh_scattering: vec3<f32>,
14
15    mie_density_exp_scale: f32,
16    mie_scattering: f32, // units: m^-1
17    mie_absorption: f32, // units: m^-1
18    mie_asymmetry: f32, // the "asymmetry" value of the phase function, unitless. Domain: (-1, 1)
19
20    ozone_layer_altitude: f32, // units: m
21    ozone_layer_width: f32, // units: m
22    ozone_absorption: vec3<f32>, // ozone absorption. units: m^-1
23}
24
25struct AtmosphereSettings {
26    transmittance_lut_size: vec2<u32>,
27    multiscattering_lut_size: vec2<u32>,
28    sky_view_lut_size: vec2<u32>,
29    aerial_view_lut_size: vec3<u32>,
30    transmittance_lut_samples: u32,
31    multiscattering_lut_dirs: u32,
32    multiscattering_lut_samples: u32,
33    sky_view_lut_samples: u32,
34    aerial_view_lut_samples: u32,
35    aerial_view_lut_max_distance: f32,
36    scene_units_to_m: f32,
37    sky_max_samples: u32,
38    rendering_method: u32,
39}
40
41
42// "Atmosphere space" is just the view position with y=0 and oriented horizontally,
43// so the horizon stays a horizontal line in our luts
44struct AtmosphereTransforms {
45    world_from_atmosphere: mat4x4<f32>,
46}