The Bidirectional Scattering Distribution Function (BSDF) of twelve optically Complex Fenestration Systems (CFS) is acquired by the scanning gonio-photometer at CC Building Envelopes. The photometric measurements are performed at high directional resolution (approx. 1 degree). The resulting BSDF data-sets can be compiled into data-driven models either to get assembled into glazing models, e.g. using software such as LBL Window, or applied in lighting simulation with Radiance.