Saw this over at Fileplanet.
"Although the CloakNT engine is mainly focused on rendering of indoor environments, it can render also a smaller outdoor scenes. In the future we are planning to join both our engines, the Mist and the CloakNT, into one superior engine. The CloakNT uses advanced portal technique which allows us to edit very complex levels. Its graphical features are the same as those in Quake3 and Unreal engines and it even adds new features which are not in any of them (like real-time per-pixel lighting and shadows). Its real-time lighting feature can be anytime switched off so the engine is also very fast on low end computers and not brand new 3D accelerators. Real-time lighting allows to edit much more dynamic scenes than it has ever been possible before. Every move e.g. of a torch in hand of a player moves cast shadows, explosions light walls, with moving objects there are also moving their shadows etc."
News source: cauldron.sk
Download: 3D Engine demo movie (30.4Mb)