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Comparison of Progressive Variants.

This slide shows four variations on the basic progressive radiosity
algorithm, each halted after one hundred iterations.  The upper left
image is the 'gathering' variant, the upper right image the 'shooting'
variant, the lower left image the 'shooting and sorting' variant, and the
lower right image is the 'shooting and sorting and ambient'
progressive radiosity variant.

The 'shooting' variants show their superiority over the 'gathering'
variant here, as more of the scene is illuminated earlier. The slide
demonstrates that the 'shooting and sorting' variant concentrates on
those surfaces that contribute most to the overall solution.