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marycn80:virtual focus 是以点光源设计时的焦点位置,有些厂家的光源文件坐标原点与焦点不重合,所以特别指出了virtual focus 的位置以便定位准确。我是这么理解的,谢谢 !~ (2016-05-25 09:55) mU1lEx$
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