Struct IblEnvironment 

pub struct IblEnvironment {
    pub name: String,
    pub irradiance_sh: [Vec3; 9],
    pub specular_mips: Vec<(f32, Vec<Vec3>)>,
    pub mip_width: u32,
    pub mip_height: u32,
    pub brdf_lut: Vec<Vec2>,
    pub brdf_lut_size: u32,
    pub exposure: f32,
    pub rotation_y: f32,
}

Prefiltered environment map for image-based lighting.

Stores irradiance and specular prefiltered maps as spherical harmonic coefficients (irradiance) and mip-level radiance data (specular).

Fields

name: String

irradiance_sh: [Vec3; 9]

9 SH coefficients for diffuse irradiance (precomputed from env map).

specular_mips: Vec<(f32, Vec<Vec3>)>

Prefiltered specular mip levels: each entry is (roughness, [6WH] data).

mip_width: u32

mip_height: u32

brdf_lut: Vec<Vec2>

BRDF integration LUT: 2D table of (NdotV, roughness) → (scale, bias).

brdf_lut_size: u32

exposure: f32

rotation_y: f32

Implementations

impl IblEnvironment

pub fn grey(name: impl Into<String>, intensity: f32) -> Self

Create from a uniform grey environment (good for testing).

pub fn sky_gradient(sky_color: Vec3, ground_color: Vec3, intensity: f32) -> Self

Build a simple gradient sky IBL (blue sky + ground).

pub fn eval_diffuse(&self, normal: Vec3) -> Vec3

Evaluate diffuse irradiance for a given surface normal.

pub fn eval_brdf_lut(&self, n_dot_v: f32, roughness: f32) -> Vec2

Evaluate the BRDF LUT at (n_dot_v, roughness).

pub fn shade_ibl(&self, normal: Vec3, view_dir: Vec3, mat: &PbrMaterial) -> Vec3

IBL contribution for a PBR material.

Trait Implementations

impl Clone for IblEnvironment

fn clone(&self) -> IblEnvironment

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for IblEnvironment

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.