Importance sampling for hair scattering
US9019298B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2013 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Sep 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/50
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A technique for rendering an image of hair in a computer-generated scene is described. The scene includes a virtual light source and a hair virtual object comprising a material model. A hair shading function partly defining the material model is accessed. A set of random values is generated. The hair shading function is importance sampled by converting the set of random values into a set of light direction samples based on a Cauchy distribution. The probability density function of each converted light direction sample uses a Cauchy distribution. A light color value and a hair color value are computed for each light direction sample of the set of light direction samples. The light color values and the hair color values are weighted to determine a set of weighted values. A characteristic of a pixel representing part of the virtual object is determined based on the set of weighted values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.