The skylab is not at all a strange place to put an HDRI lighting feature....

3dsmax for instance works HDRI lighting with final gathering and a special light known as a "skylight" which basically simulates light comming from the sky as if it were a dome around your scene.

Supplying a heavily blurred HDRI image to these skylights and you'll have your HDRI lighting (the blurring gives a clean smooth lighting situation). HDRI reflections are generated by using unblurred HDRI images put in the "environment" slot of the scene, which again encompasses the entire scene as if it was a dome around it.

That is rather similar to a sky isnt it? Bryce sky's are sort of wrapped around ur scene like domes also.

(_/)
(='.'=)
(")(")This is Bunny. Copy and paste bunny into your signature to help him gain world domination.