Ray data files are a common way to model light sources, such as light emitting diodes (LEDs), in optical design software. Often, when an LED shall be placed at the focal point of a collimating lens, it is desirable to know the coordinates of just a single point, which is representative of the light source location, similar to the center of mass for a distribution of matter. In some communities, this point is known as the “virtual focus,” and some LED vendors publish the virtual focus coordinates with their ray data sources. However, it is hard to find a clear and precise definition of the virtual focus, and it is not clear how it can be computed in an efficient way. We explain our definition and provide an efficient algorithm and its MATLAB® implementation.

中文翻译：

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射线数据源的虚拟焦点

光线数据文件是光学设计软件中对光源（例如发光二极管 (LED)）进行建模的常用方法。通常，当将 LED 放置在准直透镜的焦点时，需要知道单个点的坐标，该点代表光源位置，类似于物质分布的质心。在一些社区中，这一点被称为“虚拟焦点”，一些 LED 供应商发布了虚拟焦点坐标及其光线数据源。然而，很难找到虚拟焦点的清晰而精确的定义，并且不清楚如何有效地计算它。我们解释我们的定义并提供有效的算法及其 MATLAB® 实现。