The shadergraph in question is not setup correctly to be used as a skybox material (note: we dont support skybox as a target) _but_ you can get most of the way there by turning off "cast shadows" as well as marking both front and back rendering for render faces. The NormalFromHeight node further uses world space position as part of derivative calculations, so will not work for a skybox case. Since you are already passing in a cloud texture, passing in a normal texture and calculating alongside the cloud texture should achieve what you are attempting to do. Marking as a feature request to support skybox.