Visibility silhouettes for masked spherical integration
US9501862B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2012 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Feb 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/40
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosure provides an approach for determining, in 3D rendering, the integrals of visibility-masked spherical functions using visibility silhouettes. For a given shade point, the visibility silhouette for that shade point includes a set of edges from the scene geometry which form the boundaries between visible and invisible regions of a hemisphere having the shade point as its center. For each shade point, a rendering application determines a set of contour edges of scene geometry, the contour edges being a superset of the set of visibility silhouette edges, by querying a 4D dual mesh. The rendering application then evaluates the integral of the visibility-masked spherical function for a given shade point by integrating over segments of discrete u-isolines for which an overlap function indicates that a ray from the shade point would not intersect scene geometry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.