Struct Primitive 

pub struct Primitive {
    pub material: Option<usize>,
    pub indices: Vec<u32>,
    pub positions: Vec<Vec3>,
    pub normals: Vec<Vec3>,
    pub uvs: Vec<[f32; 2]>,
    pub joints: Vec<[u16; 4]>,
    pub weights: Vec<[f32; 4]>,
    pub additional_influence_sets: Vec<AdditionalInfluenceSet>,
}

One triangle-list primitive sharing a material. Attribute arrays may be indexed already; Primitive::weld dedupes an unindexed primitive into indexed form.

Additional glTF skin-influence attribute sets are intentionally metadata only. The primary four influences remain in Self::joints and Self::weights; consumers can use this metadata to apply their own policy without the core assuming how additional influences are evaluated.

Fields

material: Option<usize>

Index into SceneAssets::materials.

indices: Vec<u32>

Triangle indices into the attribute arrays; empty = unindexed.

positions: Vec<Vec3>

Vertex positions in scene units.

normals: Vec<Vec3>

Same length as positions, or empty.

uvs: Vec<[f32; 2]>

Same length as positions, or empty.

joints: Vec<[u16; 4]>

Indices into an owning instance’s skin-joint list; empty if unskinned.

weights: Vec<[f32; 4]>

Skinning weights parallel to Primitive::joints.

additional_influence_sets: Vec<AdditionalInfluenceSet>

Declared non-primary skin-influence attribute sets.

Each entry records whether the glTF primitive had JOINTS_n and/or WEIGHTS_n for n >= 1. Entries are sorted by AdditionalInfluenceSet::set_index.

Implementations

impl Primitive

pub fn weld(&mut self)

Dedupe identical corners into indexed triangles. Exact bit-equality only — no tolerance welding, so seams authored via split normals/UVs are preserved.

Trait Implementations

impl Clone for Primitive

fn clone(&self) -> Primitive

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Primitive

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

Formats the value using the given formatter.

impl Default for Primitive

fn default() -> Primitive

Returns the “default value” for a type.