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中文摘要：
一个简单方法被建议设计形式自由的表面因为 Lambertian 扩大了来源。在这个方法，它能经由与一条动态地计算的相等的光线代替每条事件光线为点来源利用设计方法。为形式自由的表面上的每个方面，相等的光线为相应事件横梁从精力射出加权的 average-emitting-position，并且重定向进被印射的 source-to-target 决定的方向。设计例子的结果证明轻分布一致性能被这个方法改进，例如，甚至 59% 罐头的改进被完成。
英文摘要：
A simple method is proposed to design free- form surface for Lambertian extended source. In this method, it can take advantage of the designing method for point source via substituting each incident ray with a dynamically calculated equivalent ray. For each facet on the freeform surface, the equivalent ray emits from the energy weighted average-emitting-position for the corre- sponding incident beam, and redirects into the direction which is determined by a source-to-target mapping. The results of the designing examples show that the light distributions＇ uniformities can be improved by this method, e.g., even the improvement of 59% can be achieved.
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