Importance Resampling for BSSRDF

Ryusuke Villemin, Christophe Hery, Per Christensen


We present a method to improve BSSRDF rendering, which reduces variance due to sampling of the scattering exit point. By using importance resampling, we are able to sample any arbitrary diffusion model, taking into account the geometry of the object at the same time. The new method is trivial to implement in any raytracer, compatible with pathtracing and progressive rendering.

Paper (PDF)

Available as Pixar Technical Memo #16-05