bevy_pbr 0.20.0

Adds PBR rendering to Bevy Engine
Documentation 
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struct Atmosphere {
    ground_albedo: vec3<f32>,
    /// Radius of the planet
    /// Units: m
    inner_radius: f32,
    /// Radius at which we consider the atmosphere to 'end' for out calculations (from center of planet)
    /// Units: m
    outer_radius: f32,
    /// Transform from world space to atmosphere space, inverse of the atmosphere entity's transform
    world_to_atmosphere: mat4x4<f32>,
}

struct AtmosphereSettings {
    transmittance_lut_size: vec2<u32>,
    multiscattering_lut_size: vec2<u32>,
    sky_view_lut_size: vec2<u32>,
    aerial_view_lut_size: vec3<u32>,
    transmittance_lut_samples: u32,
    multiscattering_lut_dirs: u32,
    multiscattering_lut_samples: u32,
    sky_view_lut_samples: u32,
    aerial_view_lut_samples: u32,
    aerial_view_lut_max_distance: f32,
    sky_max_samples: u32,
    rendering_method: u32,
}

/// "Atmosphere space" uses local up for the zenith so the horizon-detail
/// parameterization concentrates texels at the viewer's horizon. Azimuth uses a
/// world-fixed reference so the terminator stays stable when tilting the camera.
struct AtmosphereTransforms {
    world_from_atmosphere: mat4x4<f32>,
    atmosphere_from_world: mat4x4<f32>,
}