Struct PbrLighting 

pub struct PbrLighting;

Cook-Torrance PBR BRDF evaluated on the CPU.

All values are in linear light-space. Apply sRGB gamma after.

Implementations

impl PbrLighting

pub fn fresnel_schlick(cos_theta: f32, f0: Vec3) -> Vec3

Schlick Fresnel approximation.

pub fn geometry_schlick_ggx(n_dot_v: f32, roughness: f32) -> f32

Schlick-GGX geometry function (one direction).

pub fn geometry_smith(n_dot_v: f32, n_dot_l: f32, roughness: f32) -> f32

Smith geometry function (both view and light).

pub fn ndf_ggx(n_dot_h: f32, roughness: f32) -> f32

GGX normal distribution function.

pub fn brdf( normal: Vec3, view_dir: Vec3, light_dir: Vec3, mat: &PbrMaterial, ) -> Vec3

Full Cook-Torrance BRDF for a single punctual light.

pub fn shade( position: Vec3, normal: Vec3, view_pos: Vec3, mat: &PbrMaterial, manager: &LightManager, ) -> Vec3

Evaluate the full PBR lighting equation at a surface point.

pub fn shade_sss( position: Vec3, normal: Vec3, view_pos: Vec3, mat: &PbrMaterial, manager: &LightManager, ) -> Vec3

Evaluate subsurface scattering contribution (simple wrapping model).