Abstract
In this paper we present an algorithm for a subsurface scattering simulation (SHSS) based on spherical harmonics. The approach has a physical basis. As we focus on specifying an algorithm suitable for commercial games, it contains simplifications designed for real-time calculations. Spherical harmonics (SH) functions were used to encode the thickness of an object in every possible direction for each vertex of a graphical model. The information about the thickness of an object is the basis for a simulation of light absorption. The starting point of our approach was the Green method [3], where the thickness is calculated by a shadow casting algorithm. In our technique the model volume is encoded by spherical harmonics similarly to the Precomputed Radiance Transfer where the SH are used to encode the values of a transfer function. The quality of our approach is presented in comparison with the other algorithms.
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Tomaszewska, A., Stefanowski, K. (2012). Real-Time Spherical Harmonics Based Subsurface Scattering. In: Campilho, A., Kamel, M. (eds) Image Analysis and Recognition. ICIAR 2012. Lecture Notes in Computer Science, vol 7324. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31295-3_47
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DOI: https://doi.org/10.1007/978-3-642-31295-3_47
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