| 摘要 |
The present invention relates to a computer-readable data storage medium comprising a graphic dataset in the form of a tiled mipmap 101, and to a method of extracting from said computer-readable data storage medium to a computer memory a subset of said mipmap 101 in the form of a clipmap 109. The present invention relates also to a computer memory containing such a clipmap 109, as well as to a method of rendering said clipmap 109 in a computer system. Each tile 104 at each level of detail of the mipmap 101 except the highest is coextensive with a discrete plurality of tiles at a next level of detail of the mipmap 101.
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