Almost immediately I fired up Blender 3D and YafaRay to test it and the technique really works. But, what if we could fake this effect using nothing more than GIMP or any other image editor? I was browsing through a SketchUp user forum this week when I found an interesting tutorial about the setup of a scene using SketchUp, Twilight Render and GIMP to fake this type of effect. There are other tools that have similar options such as Maxwell Render and their Multilight feature, and even V-Ray and Mental Ray with the use of a MAXScript in 3ds Max. For instance, we can have in the same rendering lights representing daylight visualization and other lights for a night shot. It allows us to produce several different renderings from a single image, and save lots of render time. With this feature we can separate several light sources into groups, and change the intensity, temperature and turn them on and off during the render. One of the most interesting features of LuxRender is the option to control light by groups.
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