module Desc:sig..end
val to_scene : Povray.scene_desc list -> Povray.scene
val add : Povray.scene_desc -> Povray.scene_desc list -> Povray.scene_desc list
val add_elems : Povray.scene_desc list -> Povray.scene_desc list -> Povray.scene_desc list
val add_desc : Povray.scene -> Povray.scene_desc -> Povray.scene
val add_descs : Povray.scene -> Povray.scene_desc list -> Povray.scene