Vávra, RadomirFilip, JiriJernej Barbic and Wen-Chieh Lin and Olga Sorkine-Hornung2017-10-162017-10-162017978-3-03868-051-2https://doi.org/10.2312/pg.20171316https://diglib.eg.org:443/handle/10.2312/pg20171316We present a practical adaptive method for acquisition of the anisotropic BRDF. It is based on a sparse adaptive measurement of the complete four-dimensional BRDF space by means of one-dimensional slices which form a sparse four-dimensional structure in the BRDF space and which can be measured by continuous movements of a light source and a sensor. Such a sampling approach is advantageous especially for gonioreflectometer-based measurement devices where the mechanical travel of a light source and a sensor creates a significant time constraint. In order to evaluate our method, we perform adaptive measurements of three materials and we simulate adaptive measurements of ten others. We achieve a four-times lower reconstruction error in comparison with the regular non-adaptive BRDF measurements given the same count of measured samples. Our method is almost twice better than a previous adaptive method, and it requires from two- to five-times less samples to achieve the same results as alternative approaches.I.3.7 [Computer Graphics]Three Dimensional Graphics and RealismColorshadingshadowingand textureI.4.1 [Computer Graphics]Digitization and Image CaptureReflectance10.2312/pg.201713161-6