The fading of materials due to light exposure over time is a major contributor to the overall aged
appearance of man-made objects. Although much attention has been devoted to the modeling of
aging and weathering phenomena over the last decade, comparatively little attention has been paid
to fading effects. In this dissertation, we present a theoretical framework for the physically-based
simulation of time-dependent spectral changes induced by absorbed radiation. This framework
relies on the general volumetric radiative transfer theory, and it employs a physicochemical approach
to account for variations in the absorptive properties of colourants. Employing this framework, a
layered fading model that can be readily integrated into existing rendering systems is developed
using the Kubelka-Munk theory. We evaluate its correctness through comparisons of measured
and simulated fading results. Challenges in the acquisition of reliable measurements are discussed.
The performance characteristics of the proposed model are analysed, and techniques for improving
the runtime cost are outlined. Finally, we demonstrate the effectiveness of this model through
renderings depicting typical fading scenarios
