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A Practical and Controllable Hair and Fur Model for Production Path Tracing
Author(s) -
Chiang Matt JenYuan,
Bitterli Benedikt,
Tappan Chuck,
Burley Brent
Publication year - 2016
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/cgf.12830
Subject(s) - ray tracing (physics) , computer science , specular reflection , tracing , azimuth , path (computing) , shading , scattering , isotropy , global illumination , distribution (mathematics) , surface finish , algorithm , optics , computer graphics (images) , mathematics , physics , mathematical analysis , rendering (computer graphics) , engineering , mechanical engineering , programming language , operating system
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.