Technical Report CIS9501

Authors: G. Elber, J-J Choi, and M-S Kim
Abstract: The traditional ray tracing technique drawing on a ray surface intersection is reduced to a ruled - or developable-surface intersection problem in an environment of freeform surfaces. By exploiting the spatial coherence gained in the ruled/developable surface tracing approach, the emulation of shadows, specular reflections and/or refractions in a freeform surface environment can be efficiently implemented. The proposed technique enables the efficient emulation of shadows, specular reflection, and translucency. An implementation of emulation of shadows as well as specular reflections is discussed. This implementation is based on a direct freeform surface renderer that scans converts isoparametric curves instead of a polygonal approximation.
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