反射渲染有两种不同的贴图混合在一起，颜色亮度上稍微有差别。
Reflection has two different maps slightly brightened in color correction and then mixed together.
对于光泽渲染来说，相同的贴图使用时只旋转90度，然后和之前的混合在一起，避免光泽重复。
For glossiness, same map is used only rotated for 90 degrees and then mixed with the original to avoid glossiness repetition.
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