Home Forums Games202-高质量实时渲染 Specular elongation,为什么各向同性的材质反射的lobe是个椭圆?

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      Aidan
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      如题,在第九节全局光照里,老师讲到下雨天红绿灯的倒影看起来被拉长了,是specular elongation现象。因为地面是各向同性的,所以法线分布是个正圆,那么一条光线的反射lobe就是一个椭圆,为什么是椭圆呢?这么说岂不是所有各向同性材质都会出现specular elongation现象?前面几张图为什么没有?
      求大佬们解惑!

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