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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 transferreddoi:10.1145/1394209.1394213 dblp:conf/vrml/FrankeJ08 fatcat:igobdylfhzetxih74vesrbzbd4