Struct UnityMesh 

pub struct UnityMesh {
    pub name: String,
    pub vertices: Vec<[f32; 3]>,
    pub normals: Vec<[f32; 3]>,
    pub tangents: Vec<[f32; 4]>,
    pub uvs: Vec<Vec<[f32; 2]>>,
    pub sub_meshes: Vec<UnitySubMesh>,
}

A Unity-shaped glTF mesh: one shared vertex array with N sub-meshes (one per glTF primitive). Maps directly to a UnityEngine.Mesh with subMeshCount sub-meshes.

Fields

name: String

Mesh name. Falls back to the glTF mesh index if the source mesh is unnamed.

vertices: Vec<[f32; 3]>

All vertex positions across all primitives, concatenated. Left-handed coordinate system (X negated relative to glTF). Tightly packed [x, y, z] floats — maps to mesh.vertices.

normals: Vec<[f32; 3]>

Vertex normals, same length as vertices. Empty if the source mesh has no normals. Left-handed coordinate system (X negated relative to glTF). Tightly packed [x, y, z] floats — maps to mesh.normals.

tangents: Vec<[f32; 4]>

Vertex tangents, same length as vertices. Empty if the source mesh has no tangents. Left-handed coordinate system (X and W negated relative to glTF). Tightly packed [x, y, z, w] floats — maps to mesh.tangents.

uvs: Vec<Vec<[f32; 2]>>

UV channels, densely packed from channel 0. uvs[k] holds all vertices for TEXCOORD_k (V-flipped for Unity’s bottom-left origin). Only channels present on every primitive are included; the vec stops at the first absent channel. Maps to mesh.SetUVs(k, uvs[k]).

sub_meshes: Vec<UnitySubMesh>

One sub-mesh per glTF primitive — maps to mesh.SetTriangles(tris, submeshIndex).