Method and apparatus for applying a shadowing operation to figures to be drawn for displaying on CRT-display
US5083287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1989 |
| Grant date | Jan 21, 1992 |
| Priority date | — |
| Expiry date | Jul 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/60
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Discrimination of the condition of polygons is carried out by performing coordinate transformation from a view reference coordinate to a light source coordinate for each polygon. Then shadowing is carried out for every pixel of the polygon which is to be partially shaded. Also when multiple light sources exist, detection of the polygon is carried out by performing a coordinate transformation to each light source coordinate system for each polygon to be subjected to a shadowing operation. The detection includes detecting whether or not each polygon is the most light source side from among several polygons, thereafter intensity for display of each pixel is obtained based upon every detection result corresponding to each light source coordinate system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.