This algorithm avoids the numerous repeated operations for getting many pixel color values without increasing the number of push and pop operations.
改进后的算法不增加入栈出栈操作的次数，却免除了原算法中为获取众多象素颜色值所需要的大量重复操作。
However, when using many pixel lights in the Forward rendering path, there are situations where combining objects may not make sense, as explained below.
然而，如果在正向渲染路径下使用很多像素光照，有一些情况下合并物体并没有效果，下面解释。
However, when using many pixel lights in the Forward rendering path, there are situations where combining objects may not make sense, as explained below.
然而，当在正向渲染路径下使用一些像素灯，有一些情况会使得合并物体不奏效，下面解释说明。
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