Abstract: 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.

One-line summary: Reduced noise in ray-traced diffusion subsurface scattering.

Published as: Pixar Technical Memo #16-05. Pixar, 2016.

Download the tech memo here: paper.pdf.

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