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P. Kán, H. Kaufmann:
"High-Quality Reflections, Refractions, and Caustics in Augmented Reality and their Contribution to Visual Coherence";
in: "Proceedings of International Symposium on Mixed and Augmented Reality (ISMAR)", IEEE Computer Society, 2012, S. 99 - 108.

In this paper we present a novel high-quality rendering system for
Augmented Reality (AR). We study ray-tracing based rendering
techniques in AR with the goal of achieving real-time performance
and improving visual quality as well as visual coherence between
real and virtual objects in a final composited image. A number of
realistic and physically correct rendering effects are demonstrated,
that have not been presented in real-time AR environments before.
Examples are high-quality specular effects such as caustics, refraction,
reflection, together with a depth of field effect and antialiasing.

We present a new GPU implementation of photon mapping and
its application for the calculation of caustics in environments where
real and virtual objects are combined. The composited image is
produced on-the-fly without the need of any preprocessing step. A
main contribution of our work is the achievement of interactive rendering
speed for high-quality ray-tracing algorithms in AR setups.

Finally we performed an evaluation to study how users perceive
visual quality and visual coherence with different realistic rendering
effects. The results of our user study show that in 40.1% cases users
mistakenly judged virtual objects as real ones. Moreover we show
that high-quality rendering positively affects the perceived visual
coherence.

http://publik.tuwien.ac.at/files/PubDat_210333.pdf