Apian-Bennewitz, PeterReinhard Klein and Holly Rushmeier2014-12-162014-12-162014978-3-905674-64-42309-5059https://doi.org/10.2312/mam.20141291https://diglib.eg.org/handle/10.2312/mam.20141291.001-004Results of building and running out-of-plane scanning gonio-photometers for a number of years and projects are presented. Key concepts are a fast drive system and adaptive scan pattern to sample peaks at higher angular resolution. It is suggested to scan the BSDF asymmetrically, at a finer angular resolution for the outgoing directions than the incident directions.