A Practical And Controllable Hair And Fur Model For Production Path Tracing

A Practical and Controllable Hair and Fur Model for Production Path Tracing

Eurographics 2016

Matt Jen-Yuan Chiang, Benedikt Bitterli, Chuck Tappan, Brent Burley

We present an energy-conserving fiber shading model for hair and fur that is efficient enough for path tracing. Our model adopts a near-field formulation to avoid the expensive integral across the fiber, accounts for all high order internal reflection events with a single lobe, and proposes a novel, closed-form distribution for azimuthal roughness based on the logistic distribution. Additionally, we derive, through simulation, a parameterization that relates intuitive user controls such as multiple-scattering albedo and isotropic cylinder roughness to the underlying physical parameters.

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