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Precomputed radiance transfer for X3D based mixed reality applications

: Franke, Tobias; Jung, Yvonne


Spencer, S.N. ; Association for Computing Machinery -ACM-, Special Interest Group on Graphics -SIGGRAPH-; European Association for Computer Graphics -EUROGRAPHICS-:
WEB3D 2008, 13th International Conference on 3D Web Technology. Proceedings : Los Angeles, California, USA, August 9-10, 2008
New York: ACM Press, 2008
ISBN: 978-1-60558-213-9
International Conference on 3D Web Technology (WEB3D) <13, 2008, Los Angeles/Calif.>
Conference Paper
Fraunhofer IGD ()
extensible 3D (X3D); mixed reality; Realtime Rendering; Precomputed Radiance Transfer (PRT); lighting; shader

We present a lightweight framework composed of two extensions to introduce precomputed radiance transfer (PRT) to X3D. Depending on the basis function, PRT is used to simulate shading, complex light transfer and effects like subsurface scattering and caustics in real time by projecting incident light and transfer functions into frequency space, which allows the solution of the integration of the rendering equation through a simple dot product. Light transfer from incident to transferred radiance thus becomes a matter of solving dot products of coefficient vectors, which can be easily evaluated on the GPU. In this paper, we identify the minimal set of components needed for an X3D application to use spherical harmonic based PRT, and discuss how further enhancements to PRT can be implemented, like new basis functions and other features.