这个分枝的网络控制了渲染高光的方向性，它去在表面上的暗部产生明亮，并且在表面的亮侧加暗。
This branch of the network controls the directionality of the rendered highlight, causing it to be bright on the dark side of the surface, and dark on the bright side of the surface.
添加一个新的选项去控制镜面高光，这样高光只显示在不透明的表面上，而不是透明的表面上。
A new option has been added to control the specular highlight so that it only appears on the opaque surface and not the transparent surface.
曝光法则。经典的建议是：保证高光区曝光准确，低光区随他去。
Exposure rules: the classic advice is, "Expose for the highlights, and let the shadows take care of themselves."
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