Struct UnityPbrMetallicRoughness 

pub struct UnityPbrMetallicRoughness {

    pub name: String,
    pub base_color_texture: Option<u32>,
    pub metallic_roughness_texture: Option<u32>,
    pub normal_texture: Option<u32>,
    pub occlusion_texture: Option<u32>,
    pub emissive_texture: Option<u32>,
    pub base_color_factor: [f32; 4],
    pub metallic_factor: f32,
    pub roughness_factor: f32,
    pub normal_scale: f32,
    pub occlusion_strength: f32,
    pub emissive_factor: [f32; 3],
    pub alpha_cutoff: f32,
    pub alpha_mode: u32,
    pub double_sided: bool,
}

A glTF 2.0 PBR metallic-roughness material in Unity-ready form.

All texture slots hold an image index (into the parent document’s image map), already resolved through the glTF texture → image indirection.

Scalar values are stored in glTF convention and must be mapped to the target shader’s property names by the importer (BiRP and URP use different names).

Fields

name: String

The material name. Falls back to the material index as a string if unnamed.

base_color_texture: Option<u32>

Base color (albedo) texture image index.

metallic_roughness_texture: Option<u32>

Metallic-roughness texture image index. glTF packing: G channel = roughness, B channel = metallic.

normal_texture: Option<u32>

Tangent-space normal map image index.

occlusion_texture: Option<u32>

Ambient occlusion texture image index. Stored in the R channel.

emissive_texture: Option<u32>

Emissive texture image index.

base_color_factor: [f32; 4]

RGBA base color factor. Default [1, 1, 1, 1].

metallic_factor: f32

Metallic factor in [0, 1]. Default 1.

roughness_factor: f32

Perceptual roughness factor in [0, 1]. Default 1. This is glTF roughness, not Unity smoothness — importer must invert for shaders that expect smoothness (smoothness = 1 - roughness_factor).

normal_scale: f32

Normal map scale multiplier. Default 1.

occlusion_strength: f32

Occlusion strength in [0, 1]. Default 1.

emissive_factor: [f32; 3]

RGB emissive factor. Default [0, 0, 0].

alpha_cutoff: f32

Alpha cutoff threshold for ALPHA_MODE_MASK. Default 0.5.

alpha_mode: u32

Alpha rendering mode: 0 = ALPHA_MODE_OPAQUE, 1 = ALPHA_MODE_MASK, 2 = ALPHA_MODE_BLEND.

double_sided: bool

false → CullMode.Back (2, single-sided); true → CullMode.Off (0, double-sided).