Within this test, the angular dependent transmittance, named bi-directional scattering transmittance function (BTDF) of a (semi)transparent material will be measured using a novel goniophotometer approach. The measurement facility is part of the optical test chain within PMVL8 und will be also combined with single measurements using the commercial device Mini-Diff V2. The resulting measurement data can be used to specify a glazing/shading/daylighting system in a high detail in terms of their angular-resolved visual reflectance and transmittance, either for an online product catalogue of manufacturers, but also for designers and engineering offices as modelling data to specify such systems in state-of-the-art simulation tools. In order to provide the full bi-directional scattering distribution function (BSDF), which includes in the end the full angular-dependent characterization of a system including forward and backward transmittance and reflectance, the measurements are coupled with state-of-the-art simulation routines in Radiance to scale up the measured results towards a full dataset, which will be provided in the standardized Klems-resolution.