与屏幕坐标（screem space）相比我们定义这些坐标时，还应在世界坐标（world space）里定义每一个顶点。你可以把世界坐标设想为一个无限大的三维笛卡儿坐标。
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深度缓冲与屏幕有着相同的宽和高，但用 z 坐标取代颜色值。
The depth buffer has the same width and height as the screen but holds z coordinates instead of color values.
不过这份最新的专利中所描述的临近检测技术则 可以感应出手指与触屏之间的间隔距离，并可以感应出尚未接触屏幕的手指在屏幕坐标上的投影坐标位置。
The latest patent describes proximity detection systems that can determine the distance between a finger and a display, along with its x and y coordinates above the interface.
根据正投影的机理，建立了点线面屏幕坐标与空间关系的转换关系。
According to mechanism of orthographic projection, this paper has set up the converted relation between screen coordinate and space coordinate.
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