/// Walk to the twin half-edge.
Walk to the twin half-edge.
Walk to the twin half - edge .
pub fn as_twin(&mut self) -> &mut Self
    {
        let halfedge_id = match self.current_info {
            Some(ref current_info) => { current_info.twin },
            None => None
        };
        self.set_current(halfedge_id);
        self
    }
pub fn as_twin ( & mut self ) -> & mut Self { let halfedge_id = match self . current_info { Some ( ref current_info ) => { current_info . twin } , None => None } ; self . set_current ( halfedge_id ) ; self }
Walk to the twin half-edge.
Walk to the twin half - edge .
&mut self