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定义在slope space的好处是微表面不会朝下

分母项是为了归一化,让pdf在投影下来的圆面积分为1

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高光的过度相对缓慢 → 光晕

Brent Burley改进出GTR (Generalized Trobridge-Reitz)有更长的尾巴

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在grazing angle下,分母的$(n, i)$会很小,以至于整个值变得很大很亮;加上$G$后,就抵消了,因为它在这种情况下的值也会变得很大。

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中间就是垂直看,就不会有什么遮挡

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