Return the name of mesh mesh_idx as UTF-8 bytes (not null-terminated).
Always non-null — unnamed meshes use their index as the name.
out_len receives the byte length.
Return a pointer to the normal data for mesh mesh_idx.
out_len receives the total number of f32 values (vertex_count × 3).
Returns null with out_len = 0 if the mesh has no normals.
Return a pointer to the tangent data for mesh mesh_idx.
out_len receives the total number of f32 values (vertex_count × 4).
Returns null with out_len = 0 if the mesh has no tangents.
Return a pointer to the UV data for mesh mesh_idx, channel channel.
out_len receives the total number of f32 values (vertex_count × 2).
Returns null with out_len = 0 if the channel is absent.