Finding intersection between two line segments is a fundamental problem in computer graphics, computer geometry, geometry modeling, etc.

求两条直线段的交点问题是计算机图形学、计算几何、几何造型等领域的最基本问题之一。

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It beams the ear's geometry into a computer, without the mess of a traditional mold or the radiation if CT scans were used to measure ear anatomy.

WSJ: Scientists use 3-D printing to help grow an ear