Struct SphericalHarmonics9 

pub struct SphericalHarmonics9 {
    pub coefficients: [Vec3; 9],
}

Second-order (L=2) spherical harmonics with 9 coefficients per color channel. Used for encoding low-frequency irradiance from environment lighting.

Fields

coefficients: [Vec3; 9]

9 RGB coefficients: coefficients[i] is the i-th SH coefficient as a color.

Implementations

impl SphericalHarmonics9

pub fn new() -> Self

pub fn basis(dir: Vec3) -> [f32; 9]

SH basis functions evaluated at a direction.

pub fn add_sample(&mut self, direction: Vec3, radiance: Vec3, weight: f32)

Add a directional sample (radiance * solid_angle) from the given direction.

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

Evaluate the irradiance for a given surface normal.

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

Evaluate as a Color.

pub fn from_ambient(color: Color) -> Self

Create SH from a constant ambient color (uniform environment).

pub fn from_sky_ground(sky_color: Color, ground_color: Color) -> Self

Create SH from a simple sky/ground gradient.

pub fn lerp(&self, other: &Self, t: f32) -> Self

Linearly interpolate between two SH environments.

pub fn add(&self, other: &Self) -> Self

Add two SH environments together.

pub fn scale(&self, factor: f32) -> Self

Scale all coefficients by a factor.

pub fn dominant_direction(&self) -> Vec3

Compute the dominant direction of the SH (direction of maximum intensity).

Trait Implementations

impl Clone for SphericalHarmonics9

fn clone(&self) -> SphericalHarmonics9

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SphericalHarmonics9

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

Formats the value using the given formatter.

impl Default for SphericalHarmonics9

fn default() -> Self

Returns the “default value” for a type.