By John Markoff
FORT LAUDERDALE, FLA. — A 3-D animated creature, affectionately named Gerald, appears to walk in circles while floating in front of an elaborate viewer that resembles something from an optometrist’s office. Though only half a foot high, and with four arms, he looks remarkably lifelike through lenses that transmit what computer scientists and optical engineers describe as a “digital light field” into the eyes of a viewer.
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