RealD allows developers to render PC and console games in stereoscopic 3D, with camera separation and 3D depth effects rendered in real-time, among other features. The first Unreal Engine 3 title to use RealD is Seamless Entertainment's SOL: Exodus, which received an update on Steam today to include 3D effects.
Unreal Engine 3 first received stereoscopic 3D capabilities in 2010 with TriOviz. TriOviz was used in Batman: Arkham Asylum Game of the Year Edition, Arkham City, Thor: God of Thunder and Enslaved: Odyssey to the West.
RealD is used in many other high-profile 3D endeavors, including films such as The Avengers, and the forthcoming titles Prometheus and The Amazing Spider-Man.