How to render fast and get more realistic image are two basic issues of computer graphics rendering.

如何提高图形的渲染效率和如何得到具有真实感的图象是图形渲染的两个基本问题。

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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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