With conventional 3-D graphics, the computer generates and stores data rendering the depth, shape, color, and texture of the entire house -- including walls, windows and doors that are out of sight.

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He later worked on 3-D graphics at gamemaker Atari, compact computing systems at Apple Computer and easy-to-use interfaces at Disney.

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According to Silicon Graphics Computer Systems, a leading supplier of 3-D workstations, prices have fallen by a third every 12 to 18 months.

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