Method for adaptively providing near Phong grade shading for patterns in a graphics display system
US5163126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1990 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | May 10, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/87
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for producing realistic shading of three-dimensional objects depicted in a graphics display system. Computationally efficient Gouraud shading is practiced in the rendering of images which routinely require Phong shading to obtain suitable realism. Gouraud shading is adaptively applied to polygon regions of preferably triangular shape at a granularity defined by heuristically derived relationships using surface normal vectors, incident light vectors and relative pixel separation information. When division of the base triangle is dictated, the methodology produces a mesh of polygons sized to be individually rendered with Gouraud shading yet provide Phong-like realism for the whole of the original polygon region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.