Virtual Goniophotometric Measurements Protocol

Many scattering models have been proposed in the graphics literature. Few of them, however, have been evaluated through comparisons with real measured data. As the demand for plausible and predictable scattering models increases, more effort is focused on performing such comparisons, which require the use of measurement devices. Once the accuracy of a given model is determined, data can be extracted from this model in several dimensions. In this paper we examine the formulation of virtual goniophotometric devices used to evaluate and extract data from scattering models. We discuss implementation issues which affect the reliability of the readings provided by these devices. Our discussion of these issues is supported by experiments whose results are also presented in this paper.