Struct MaterialBaseData

pub struct MaterialBaseData {
    pub rgba: u32,
    pub metallic_roughness: u32,
    pub emissive_rgb: u32,
    pub alpha_etc: u32,
}

The basic data for a material; the most simple material is actually just RGB, but to keep the system simple the BaseData includes an alpha, metallicness and roughness.

For a simple material the alpha should be 1.0, and the metallic 0, and roughness 1

The simplest of shaders will use just the RGB values

Gltf

Fields

rgba: u32

Color of the material

Least signficant is R, most A (0 transparent, of course)

metallic_roughness: u32

Metallic nature of the material: 0 is fully dielectric, 1.0 is fully metallic

Roughness of the material: 0.5 is specular, no specular down to 0 full reflection, up to 1 fully matt

Each is 16 bits; least significant is metallic

emissive_rgb: u32

The emissive color of the texture; 0 if unused

Least signficant is R

alpha_etc: u32

The alpha data for the texture (alpha mode, alpha cutoff, etc)

effectively extensions

Implementations

impl BaseData

pub fn of_rgba((r, g, b, a): (u8, u8, u8, u8)) -> Self

Create a new material with a given RGBA

pub fn set_rgba(&mut self, (r, g, b, a): (u8, u8, u8, u8))

Set the r,g,b,a

pub fn set_emissive_rgb(&mut self, (r, g, b): (u8, u8, u8))

Set the emissive r,g,b

pub fn set_mr(&mut self, metallic: f32, roughness: f32)

Set the metallic and roughness of a material

pub fn metallic_roughness(&self) -> (f32, f32)

Get the metallic and roughness of a material

pub fn rgba_tuple(&self) -> (u8, u8, u8, u8)

Return a tuple of R, G, B, A of the color

Trait Implementations

impl Clone for BaseData

fn clone(&self) -> BaseData

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BaseData

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

Formats the value using the given formatter.

impl Default for BaseData

fn default() -> Self

Returns the “default value” for a type.

impl From<u32> for BaseData

fn from(rgba: u32) -> Self

Converts to this type from the input type.