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(Very) short survey about light scattering applied to hair rendering.

(Very) short survey about light scattering applied to hair rendering. Valentin JANIAUT KAIST (Korea Advanced Institute of Science and Technology). Chronology. 2003: Light Scattering from Human Fiber [Marschner et al.]

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(Very) short survey about light scattering applied to hair rendering.

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  1. (Very) short survey about light scattering applied to hair rendering. Valentin JANIAUT KAIST (Korea Advanced Institute of Science and Technology)

  2. Chronology • 2003: Light Scattering from Human Fiber [Marschner et al.] • 2004: A Self-Shadow Algorithm for Dynamic Hair using Density Clustering [Mertens et al.] • 2006: Scattering-Based Interactive Hair Rendering [Rajeev Gupta] • 2007: Practical Global Illumination for Hair Rendering [Cem Yuksel] • 2008: Dual scattering approximation for fast multiple scattering in hair. [Zinke] • 2008: Efficient multiple scattering in hair using spherical harmonics. [Moon et .al] • 2010: Interactive hair rendering under environment lighting.

  3. Main problem of Hair Rendering ? Hair Strand x ~300.000

  4. Bidirectional Scattering Distribution Function BRDF BTDF BSDF

  5. Light scattering from human fiber [Marschner] The “Marschner” scattering 2003

  6. Dual Scattering approximation [Zinke] Single vs Multiple Scattering 2008 Single Multiple

  7. Single scattering • Each fiber receive light only from the environment, not from the other fiber.

  8. Dual Scattering approximation [Zinke] Multiple Scattering 2008 • Need specific hair geometry representation.

  9. Importance sampling of products from illumination and BRDF using spherical radial basis function. [Tsai] A case of BRDF compression 2006 • One SRBF per viewing direction. • Geometry independent. • Fast integration.

  10. Efficient Multiple Scattering in Hair Using Spherical Harmonics [Moon] Multiple Scattering Rendering using Spherical Harmonic 2008 Spherical Harmony compress the geometry data and the lighting.

  11. About interactive hair rendering • Separation between the hair geometry and the light scattering. • Pre-computation of the light scattering.

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