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Caustics Mapping: An Image-Space Technique for Real-Time Caustics

Musawir Shah, Jaakko Konttinen, Sumanta Pattanaik
School of Computer Science, University of Central Florida, Orlando, FL
IEEE Transactions on Visualization and Computer Graphics, 2007

@article{shah2007caustics,

   title={Caustics mapping: An image-space technique for real-time caustics},

   author={Shah, M.A. and Konttinen, J. and Pattanaik, S.},

   journal={IEEE Transactions on Visualization and Computer Graphics},

   pages={272–280},

   year={2007},

   publisher={Published by the IEEE Computer Society}

}

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In this paper, we present a simple and practical technique for real-time rendering of caustics from reflective and refractive objects. Our algorithm, conceptually similar to shadow mapping, consists of two main parts: creation of a caustic map texture, and utilization of the map to render caustics onto nonshiny surfaces. Our approach avoids performing any expensive geometric tests, such as ray-object intersection, and involves no precomputation; both of which are common features in previous work. The algorithm is well suited for the standard rasterization pipeline and runs entirely on the graphics hardware
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