Concepts is a level created by Luke (Lunch Bone) for the Portal 2 workshop. The light smoothening and ambient occlusion bring depth to this Old Aperture map, making the dark environment flow with the tone set by the map.
Dead and Stagnant is a level created by Orlando2303 as an attempt to play on Alive and Kicking. Ambient Occlusion compliments this map very well, however light smoothening is not used here. Light smoothening reduces the cool lighting feel of the environment.
Use the image above to see the visual differences between Valve's VRAD and BumRAD
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