Clipping with addition of vertices to existing primitives
US7292242B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2004 |
| Grant date | Nov 6, 2007 |
| Priority date | — |
| Expiry date | Apr 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/30
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Clipping techniques introduce additional vertices into existing primitives without requiring creation of new primitives. For an input triangle with one vertex on the invisible side of a clipping surface, a quadrangle can be defined. The vertices of the quadrangle are the two internal vertices of the input triangle and two clipped vertices. For determining attribute values for pixel shading, three vertices of the quadrangle are selected, and a parameter value for an attribute equation is computed using the three selected vertices. For determining pixel coverage for the quadrangle, the three edges that do not correspond to the edge created by clipping are used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.