A Practical and Controllable Hair and Fur Model
for Production Path Tracing
Matt Jen-Yuan Chiang Benedikt Bitterli Chuck Tappan Brent Burley
Computer Graphics Forum (Proceedings of Eurographics 2016)
Abstract
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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