Irradiance arriving at a surface varies according to the cosine of the angle of incidence of illumination, since illumination is over a larger area at larger incident angles.
刚刚看PBRT看到的.我真是个垃圾,搞了这么多年,今天才搞明白.最近下班刷高数,周末搞PBRT,还是有点用的.和各位分享下.我再去卷一会儿~谁也不要拦着我!hhh
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