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Abstract:
Accurate representations of objects and light sources in a scene
model are a crucial prerequisite for realistic image synthesis using
computer graphics techniques. This thesis presents techniques for
the efficient acquisition of real world objects and real world light
sources, as well as an assessment of the quality of the acquired
models.
Making use of color management techniques, we setup an appearance
reproduction pipeline that ensures best-possible reproduction of
local light reflection with the available input and output devices.
We introduce a hierarchical model for the subsurface light transport in
translucent objects, derive an acquisition methodology, and acquire
models of several translucent objects that can be rendered
interactively. Since geometry models of real world objects are
often acquired using 3D range scanners, we also present a method
based on the concept of modulation transfer functions to evaluate
their accuracy.
In order to illuminate a scene with realistic light sources, we
propose a method to acquire a model of the near-field emission
pattern of a light source with optical prefiltering. We apply this
method to several light sources with different emission
characteristics and demonstrate the integration of the acquired
models into both, global illumination as well as
hardware-accelerated rendering systems.
