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"abstractText" : "The paper presents simple, physically plausible, but not physically\nbased reflectance models for metals and other specular materials. So\nfar there has been no metallic BRDF model that is easy to compute,\nsuitable for fast importance sampling and is physically plausible. This\ngap is filled by appropriate modifications of the Phong, Blinn and the\nWard models. The Phong and the Blinn models are known not to have\nmetallic characteristics. On the other hand, this paper also shows that\nthe Cook-Torrance and the Ward models are not physically plausible,\nbecause of their behavior at grazing angles. We also compare the\nprevious and the newly proposed models. 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