Enum MaterialKind 

pub enum MaterialKind {
    Lambert,
    Phong,
    Pbr,
}

Describes the shading model applied to a Material during lighting and ray-tracing evaluation.

Variants

Lambert

Pure Lambertian diffuse, no specular highlight.

LightingUniforms::shade evaluates the diffuse term only.

Phong

Lambertian diffuse plus Blinn-Phong style specular highlight.

LightingUniforms::shade evaluates the diffuse term plus a specular lobe driven by the material’s specular and shininess fields.

Pbr

Diffuse with a Schlick fresnel rim, and no separate specular lobe.

This is not a full PBR model

A physically based renderer would evaluate a microfacet BRDF with roughness-driven geometry, a metallic / dielectric split, multiple scattering, and per-channel Fresnel. None of that is implemented here. What this variant actually does is scale the Lambertian diffuse term by apply_schlick_fresnel, which brightens grazing angles and adds a rim. That is a deliberate, documented approximation rather than the physically based model the variant name suggests.

The variant is kept rather than removed so callers can branch on material model without a breaking change when a real BRDF lands. Note that specular and shininess are ignored on this path: the diffuse fresnel blend replaces them entirely.

Trait Implementations

impl Clone for MaterialKind

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MaterialKind

impl Debug for MaterialKind

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

Formats the value using the given formatter.

impl Default for MaterialKind

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for MaterialKind

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for MaterialKind