A per-pixel displacement mapping method that provides high accuracy as well as real-time performance. Paper & Sample Shader http://ki-h.com/article/ipdm.html

Edit:

Looks really good! Alot better than standard relief mapping; Also seems very fast, however, how does the speed compare to cone step mapping?

Its amazing how it accurately renders that field of pillars as seen in the paper; This could work very well for things like hair and fur rendering (amoung other things)

[Edited by - coderchris on September 30, 2007 10:39:13 AM]