Maxwell Demonstrates Realtime Interactive Lighting
http://www.maxwellrender.com/files/…and_edition.aviÂ
In this video, 2 separate features are being shown - 1) the assembly of cooperatively rendered images into a single image and 2) Realtime interactive lighting. The lighting does not require multiple passes - you don’t need a separate file for each light. Even without cooperative rendering, in a standard single-node render, you just automatically have control over the intensity of any and all lights in the scene both during the render or after it’s finished.
This is just a preview of the feature; interface refinements are pending, but the advantage of the system is pretty obvious. For all intents and purposes, you can just set all your lights to some default value and make adjustments as the render progresses, or when it’s done as much as you want to. Caustics, indirect lighting, reflections, everything is controllable in this fashion, not just light intensity.