ISHair: Importance Sampling for Hair Scattering |
| |
Authors: | Jiawei Ou Feng Xie Parashar Krishnamachari Fabio Pellacini |
| |
Affiliation: | 1. DreamWorks Animation;2. Dartmouth College;3. Sapienza University of Rome |
| |
Abstract: | We present an importance sampling method for the bidirectional scattering distribution function (bsdf) of hair. Our method is based on the multi‐lobe hair scattering model presented by Sadeghi et al. SPJT10] ]. We reduce noise by drawing samples from a distribution that approximates the bsdf well. Our algorithm is efficient and easy to implement, since the sampling process requires only the evaluation of a few analytic functions, with no significant memory overhead or need for precomputation. We tested our method in a research raytracer and a production renderer based on micropolygon rasterization. We show significant improvements for rendering direct illumination using multiple importance sampling and for rendering indirect illumination using path tracing. |
| |
Keywords: | I 3 7 [Computer Graphics]: Three‐Dimensional Graphics and Realism— Color shading shadowing and texture |
|