01474nas a2200145   4500000000100000000000100001008004100002260008300043100001900126700001500145700001900160245011600179520101100295020002201306       2021                            d  c12/2021bAssociation Internationale pour l'Histoire du VerreaIstanbul, Turkey1 aAndreas Noback1 aLars Grobe1 aFranziska Lang00aModeling the effects of daylight scattering by window glass: The case of sixth century Hagia Sophia in Istanbul3 aThe utilization of daylight in Hagia Sophia is discussed as one of the key elements of its architectural design. But little attention has been paid to the impact of window glass on the lighting of its late antique interior. Production processes leading to air inclusions in the glass volume, uneven thickness and undulated surfaces of Roman window glass cause scattering of transmitted and reflected light. In a preceding study, the scattering properties of four exemplary finds of Roman glass were quantitatively ascertained. A transmission model fit to these measured optical properties is applied with a geometric model of Hagia Sophia in daylight simulations. Two reference cases of ideally clear and perfectly diffuse glass are defined. The effects of the three modeled glazing types on the light distribution in the building interior under different sky conditions are compared. The study shall initiate a discussion on the glazing’s impact on the visual perception of the interior of Hagia Sophia.  a978-605-7880-10-9