I read this page on steep parralax page, (mentioning reedbeta in it) they said
the silluette wasnt done before, even tho it looks exactly the same a displacement mapping (the total plus).
Its possible, I know, with creative shader work.
but this is the post that finishes off that steep parralax algorythm, im just
saying the end of it is extremely possible but you might as well learn dx10
and tesselate realtime to beat it.
Anyway, if you dont care, you wont do it.
Me, im moving on to displacement mapping and taking on severe vertex load.