(define* (draw-meshes #:optional (meshes (hash-map->list (lambda (k v) v) default-view)))
(cond ((not (null? meshes))
(catch #t
(define* (draw-meshes #:optional (meshes (hash-map->list (lambda (k v) v) default-view)))
(cond ((not (null? meshes))
(catch #t