This article lies the initial groundwork required for establishing a ray pick routine, by providing algorithms and working code to convert a pixel coordinate into a ray in world space.
本文介绍建立光线拾取路径最初的基本工作，提供了将像素坐标转换到光线空间的算法和工作代码。
Note that because the origin of the world coordinate space is at the upper-left corner of the client area, the page coordinates are the same as the world coordinates.
请注意，由于全局座标空间的原点位于工作区的左上角，因此画面座标和全局座标是相同的。
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