Rendering fur with three dimensional textures
SIGGRAPH '89 Proceedings of the 16th annual conference on Computer graphics and interactive techniques
Light scattering from human hair fibers
ACM SIGGRAPH 2003 Papers
Robust monte carlo methods for light transport simulation
Robust monte carlo methods for light transport simulation
A Survey on Hair Modeling: Styling, Simulation, and Rendering
IEEE Transactions on Visualization and Computer Graphics
Light Scattering from Filaments
IEEE Transactions on Visualization and Computer Graphics
Efficient multiple scattering in hair using spherical harmonics
ACM SIGGRAPH 2008 papers
Dual scattering approximation for fast multiple scattering in hair
ACM SIGGRAPH 2008 papers
An artist friendly hair shading system
ACM SIGGRAPH 2010 papers
ISHair: Importance Sampling for Hair Scattering
Computer Graphics Forum
An energy-conserving hair reflectance model
EGSR'11 Proceedings of the Twenty-second Eurographics conference on Rendering
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We present a new strategy for importance sampling hair reflectance models. To combine hair reflectance models with increasingly popular physically-based rendering algorithms, an efficient sampling scheme is required to select scattered rays that lead to lower variance and noise. Our new strategy, which is tied closely to the derivation of physically-based fiber functions, works well for both smooth and rough fibers based on the Marschner et al. model and also for Lambertian fibers. It should be directly usable with future hair reflectance models that allow for more general cross-sections and more complex surface properties, provided the lobes are derived in a similar, separable fashion. Our strategy includes lobe selection and can efficiently sample complex lobe shapes like the Marschner TRT function. The scheme is easy to implement and requires no precomputation, allowing fully heterogeneous variation of all fiber parameters.