Submesh:[mesh: Mesh, material: Material | null, extraAttributesHint?: Hint]
A pair containing a WL.Mesh instance, its assigned WL.Material and an
optional list of extra mesh attribute hints.
The extra mesh attributes list defines the list of attributes that need to be
handled. If none is passed, then all mesh attributes will be handled,
including mesh attributes that are potentially not used, since the available
attributes are dictated by the existing pipelines, not by each mesh.
A pair containing a WL.Mesh instance, its assigned WL.Material and an optional list of extra mesh attribute hints.
The extra mesh attributes list defines the list of attributes that need to be handled. If none is passed, then all mesh attributes will be handled, including mesh attributes that are potentially not used, since the available attributes are dictated by the existing pipelines, not by each mesh.