A few terrain displacement tests. Used 3delight and mental ray to achive these results. The mental ray renders were enhanced with normal maps. Bump mapping wasn't necessary for rendering with 3delight; displacement results hold high detail with low render times.
If you use CrazyBump or Xnormal to generate normal maps, I find this shader very helpful for the tuning process. It removes the need to 'tweak' parameters in a separate app. The author's (Felix Reichert) site is here.
Derek Jenson Blog
My website serves to archive experiments, document projects, share techniques, and motivate further exploration & artistry in 3d space.