An Energy-Conserving Hair Reflectance Model
Article first published online: 19 JUL 2011
© 2011 The Author(s) Computer Graphics Forum © 2011 The Eurographics Association and Blackwell Publishing Ltd.
Computer Graphics Forum
Volume 30, Issue 4, pages 1181–1187, June 2011
How to Cite
d'Eon, E., Francois, G., Hill, M., Letteri, J. and Aubry, J.-M. (2011), An Energy-Conserving Hair Reflectance Model. Computer Graphics Forum, 30: 1181–1187. doi: 10.1111/j.1467-8659.2011.01976.x
- Issue published online: 19 JUL 2011
- Article first published online: 19 JUL 2011
- I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism—Shading
We present a reflectance model for dielectric cylinders with rough surfaces such as human hair fibers. Our model is energy conserving and can evaluate arbitrarily many orders of internal reflection. Accounting for compression and contraction of specular cones produces a new longitudinal scattering function which is non-Gaussian and includes an off-specular peak. Accounting for roughness in the azimuthal direction leads to an integral across the hair fiber which is efficiently evaluated using a Gaussian quadrature. Solving cubic equations is avoided, caustics are included in the model in a consistent fashion, and more accurate colors are predicted by considering many internal pathways.