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Progressive Radiosity Examples.
This slide illustrates the iterative nature of the progressive method.
The composite image shows that as the number of iterations
increase, the accuracy of the intensity solution (and, hence, the
resulting image) also increases. Of particular interest is the
contribution of the color of the walls of the room to the overall color of
the room in the rightmost section of the composite image. This image
was created by calculating three separate images, each halted at a
different stage of rendering, and composited together afterwards.