Created with the busy and rigorous 3D artist in mind, this topnotch raytracing technology allows immediate interaction between the user and the virtual environment. V-Ray RT follows the user’s actions while working on the scene and automatically and progressively generates a photorealistic preview of the scene. It is designed to improve and fasten the artist’s work on the Texturing and Lightening stage.
More Info:http://www.chaosgroup.com/en/2/vrayrt.html