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ceiling floortile pinkwall walkway painted agglomerate granite polished ceramic plastic with a glossy varnish Figure 1: Four material samples as the subject of the validation. The samples are referred by their location in a building. Abstract We discuss the validation of BTF data measurements by means used for BRDF measurements. First, we show how to apply the Helmholtz reciprocity and isotropy for a single data set. Second, we discuss a cross-validation for BRDF measurement data obtained fromdoi:10.1145/1090122.1090149 dblp:conf/sccg/HavranNZPS05 fatcat:pai6qeh5nnfwhgnbdopds2voca