Struct Material 

pub struct Material {

    pub base_color: [f32; 4],
    pub emissive_factor: [f32; 3],
    pub alpha_mode: AlphaMode,
    pub alpha_cutoff: f32,
    pub blend_opaque_alpha_threshold: f32,
    pub base_texture: Option<String>,
    pub base_texture_transform: TextureTransform,
    pub emissive_texture: Option<String>,
    pub emissive_texture_transform: TextureTransform,
    pub normal_texture: Option<String>,
    pub normal_texture_transform: TextureTransform,
    pub normal_scale: f32,
    pub normal_map_flip_y: bool,
    pub normal_map_two_component: bool,
    pub metallic_roughness_texture: Option<String>,
    pub metallic_roughness_texture_transform: TextureTransform,
    pub occlusion_texture: Option<String>,
    pub occlusion_texture_transform: TextureTransform,
    pub occlusion_strength: f32,
    pub roughness: f32,
    pub metallic: f32,
    pub unlit: bool,
    pub double_sided: bool,
    pub transmission_factor: f32,
    pub transmission_texture: Option<String>,
    pub transmission_texture_transform: TextureTransform,
    pub thickness: f32,
    pub thickness_texture: Option<String>,
    pub thickness_texture_transform: TextureTransform,
    pub attenuation_color: [f32; 3],
    pub attenuation_distance: f32,
    pub ior: f32,
    pub specular_factor: f32,
    pub specular_color_factor: [f32; 3],
    pub specular_texture: Option<String>,
    pub specular_texture_transform: TextureTransform,
    pub specular_color_texture: Option<String>,
    pub specular_color_texture_transform: TextureTransform,
    pub emissive_strength: f32,
    pub diffuse_transmission_factor: f32,
    pub diffuse_transmission_texture: Option<String>,
    pub diffuse_transmission_texture_transform: TextureTransform,
    pub diffuse_transmission_color_factor: [f32; 3],
    pub diffuse_transmission_color_texture: Option<String>,
    pub diffuse_transmission_color_texture_transform: TextureTransform,
    pub dispersion: f32,
    pub anisotropy_strength: f32,
    pub anisotropy_rotation: f32,
    pub anisotropy_texture: Option<String>,
    pub anisotropy_texture_transform: TextureTransform,
    pub iridescence_factor: f32,
    pub iridescence_texture: Option<String>,
    pub iridescence_texture_transform: TextureTransform,
    pub iridescence_ior: f32,
    pub iridescence_thickness_minimum: f32,
    pub iridescence_thickness_maximum: f32,
    pub iridescence_thickness_texture: Option<String>,
    pub iridescence_thickness_texture_transform: TextureTransform,
    pub sheen_color_factor: [f32; 3],
    pub sheen_color_texture: Option<String>,
    pub sheen_color_texture_transform: TextureTransform,
    pub sheen_roughness_factor: f32,
    pub sheen_roughness_texture: Option<String>,
    pub sheen_roughness_texture_transform: TextureTransform,
    pub clearcoat_factor: f32,
    pub clearcoat_texture: Option<String>,
    pub clearcoat_texture_transform: TextureTransform,
    pub clearcoat_roughness_factor: f32,
    pub clearcoat_roughness_texture: Option<String>,
    pub clearcoat_roughness_texture_transform: TextureTransform,
    pub clearcoat_normal_texture: Option<String>,
    pub clearcoat_normal_texture_transform: TextureTransform,
    pub clearcoat_normal_scale: f32,
}

PBR material definition following glTF 2.0 conventions.

Supports the metallic-roughness workflow with optional textures for each parameter. Includes glTF extensions: KHR_materials_transmission, KHR_materials_volume, KHR_materials_specular, and KHR_materials_emissive_strength.

Fields

base_color: [f32; 4]

Base color (albedo) as RGBA. Multiplied with base_texture if present.

emissive_factor: [f32; 3]

Emissive color multiplier as RGB.

alpha_mode: AlphaMode

Transparency handling mode.

alpha_cutoff: f32

Alpha threshold for AlphaMode::Mask.

blend_opaque_alpha_threshold: f32

Alpha threshold above which a fragment of an AlphaMode::Blend material is treated as effectively opaque by the depth prepass: fragments at or above this value write depth so transparent fragments behind them are correctly occluded; fragments below the threshold skip the prepass and accumulate through OIT. Defaults to 0.99; lower it for materials with soft alpha edges like anti-aliased text or decals where a tighter threshold produces visible halos in OIT.

base_texture: Option<String>

Path to base color texture.

base_texture_transform: TextureTransform

emissive_texture: Option<String>

Path to emissive texture.

emissive_texture_transform: TextureTransform

normal_texture: Option<String>

Path to normal map texture.

normal_texture_transform: TextureTransform

normal_scale: f32

Normal map intensity multiplier.

normal_map_flip_y: bool

Flip normal map Y (green) channel for DirectX-style maps.

normal_map_two_component: bool

Two-component normal map (RG only, B reconstructed).

metallic_roughness_texture: Option<String>

Path to metallic (B) / roughness (G) texture.

metallic_roughness_texture_transform: TextureTransform

occlusion_texture: Option<String>

Path to ambient occlusion texture (R channel).

occlusion_texture_transform: TextureTransform

occlusion_strength: f32

Occlusion effect strength (0 = none, 1 = full).

roughness: f32

Surface roughness (0 = smooth/mirror, 1 = rough/diffuse).

metallic: f32

Metallic factor (0 = dielectric, 1 = metal).

unlit: bool

Skip lighting calculations (flat shaded).

double_sided: bool

Render both sides of faces.

transmission_factor: f32

Transmission factor for refractive materials (KHR_materials_transmission).

transmission_texture: Option<String>

transmission_texture_transform: TextureTransform

thickness: f32

Volume thickness for transmission (KHR_materials_volume).

thickness_texture: Option<String>

thickness_texture_transform: TextureTransform

attenuation_color: [f32; 3]

Light absorption color inside the volume.

attenuation_distance: f32

Distance at which light is attenuated to attenuation_color.

ior: f32

Index of refraction (default 1.5 for glass).

specular_factor: f32

Specular intensity override (KHR_materials_specular).

specular_color_factor: [f32; 3]

Specular color tint.

specular_texture: Option<String>

specular_texture_transform: TextureTransform

specular_color_texture: Option<String>

specular_color_texture_transform: TextureTransform

emissive_strength: f32

Emissive intensity multiplier (KHR_materials_emissive_strength).

diffuse_transmission_factor: f32

Diffuse transmission factor (KHR_materials_diffuse_transmission). Fraction of base color light transmitted as Lambertian through the surface.

diffuse_transmission_texture: Option<String>

diffuse_transmission_texture_transform: TextureTransform

diffuse_transmission_color_factor: [f32; 3]

Color tint applied to the diffuse-transmitted light.

diffuse_transmission_color_texture: Option<String>

diffuse_transmission_color_texture_transform: TextureTransform

dispersion: f32

Chromatic dispersion strength (KHR_materials_dispersion). Splits the refraction angle per wavelength using Cauchy’s approximation.

anisotropy_strength: f32

Anisotropy strength (KHR_materials_anisotropy). 0 = isotropic, 1 = maximum.

anisotropy_rotation: f32

Rotation of anisotropic direction in radians around the surface normal.

anisotropy_texture: Option<String>

anisotropy_texture_transform: TextureTransform

iridescence_factor: f32

Iridescence strength (KHR_materials_iridescence). 0 = none, 1 = full thin-film effect.

iridescence_texture: Option<String>

iridescence_texture_transform: TextureTransform

iridescence_ior: f32

Index of refraction for the iridescent thin-film layer.

iridescence_thickness_minimum: f32

Minimum film thickness in nanometers.

iridescence_thickness_maximum: f32

Maximum film thickness in nanometers (modulated by iridescence_thickness_texture.g).

iridescence_thickness_texture: Option<String>

iridescence_thickness_texture_transform: TextureTransform

sheen_color_factor: [f32; 3]

Sheen color (KHR_materials_sheen). Multiplied with sheen_color_texture if present.

sheen_color_texture: Option<String>

sheen_color_texture_transform: TextureTransform

sheen_roughness_factor: f32

Sheen roughness (0 = sharp, 1 = smooth velvet).

sheen_roughness_texture: Option<String>

sheen_roughness_texture_transform: TextureTransform

clearcoat_factor: f32

Clearcoat layer strength (KHR_materials_clearcoat). 0 = none, 1 = full coat.

clearcoat_texture: Option<String>

clearcoat_texture_transform: TextureTransform

clearcoat_roughness_factor: f32

Clearcoat layer roughness.

clearcoat_roughness_texture: Option<String>

clearcoat_roughness_texture_transform: TextureTransform

clearcoat_normal_texture: Option<String>

Optional separate normal map for the clearcoat layer.

clearcoat_normal_texture_transform: TextureTransform

clearcoat_normal_scale: f32

Implementations

impl Material

pub fn is_transparent(&self) -> bool

Returns true if this material requires transparency handling.

pub fn texture_names(&self) -> impl Iterator<Item = &str>

Yields every texture name referenced by this material across every PBR slot (base color, normal map, metallic-roughness, all glTF extension textures). Used by the texture cache to bump and drop reference counts without missing any slots.

Trait Implementations

impl Clone for Material

fn clone(&self) -> Material

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Material

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

Formats the value using the given formatter.

impl Default for Material

fn default() -> Material

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Material

fn deserialize<__D>( __deserializer: __D, ) -> Result<Material, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Material

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Material

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Material