Abstract :
This paper presents a novel method for real-time homogenous translucent material editing under fixed illumination.
We consider the complete analytic BSSRDF model proposed by Jensen et al. [JMLH01], including both
multiple scattering and single scattering. Our method allows the user to adjust the analytic parameters of BSSRDF
and provides high-quality, real-time rendering feedback. Inspired by recently developed Precomputed Radiance
Transfer (PRT) techniques, we approximate both the multiple scattering diffuse reflectance function and the single
scattering exponential attenuation function in the analytic model using basis functions, so that re-computing
the outgoing radiance at each vertex as parameters change reduces to simple dot products. In addition, using a
non-uniform piecewise polynomial basis, we are able to achieve smaller approximation error than using bases
adopted in previous PRT-based works, such as spherical harmonics and wavelets. Using hardware acceleration,
we demonstrate that our system generates images comparable to [JMLH01] at real-time frame-rates.
