Daylight simulation workflows incorporating measured bidirectional scattering distribution functions

Daylight predictions of architectural spaces depend on good estimates light transfer through skylights, windows and other fenestration systems. For clear glazing painted surfaces, parametric transmission reflection models have proven adequate, but there are many cases where light-scattering, semi-specular shading daylighting materials defy simple characterization. Something as commonplace fabric roller shades venetian blinds may turn daylight prediction into guesswork, numerous advanced systems the market tuned specifically to enhance not sufficiently characterized distinguish their performance. In this paper, we describe new tools available handle novel specialized fabrics, materials, devices using data-driven modelling bi-directional scattering distribution functions (BSDFs). These representations usually tabulated at constant or adjustable angular resolution for efficient point-in-time annual simulations. We a variety BSDF simulation workflows, including some methods that make analysis possible, highlight current challenges. conclude with discussion future work how such data might be created shared worldwide.