Process for eliminating hidden faces for synthesis of a three-dimensional wire image
US5125074A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1989 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Aug 10, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/405
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A process for eliminating hidden faces for synthesis of a three-dimensional wire image from the set of edges of a wire image, the edges being provided with priority parameters making it possible to restore the appearances of a third-dimension. The process consists of: PA1 cutting the set of ordinate values into intervals [Y(i),Y(i+1)] as a function of the ordinates of the edge ends; PA1 determining, in each interval [Y(i),Y(i+1)], the coordinates of intersection points (I1 . . . I4) of the edges; PA1 making, for each edge (AB), an arranged list of points of intersection of this edge with more priority edges; PA1 determining, for each intersection point (I1 . . . I4), the value of an indicator indicating whether the facet of the most priority edge masks the least priority edge, starting from the intersection point considered, or masks it before the intersection point considered or else masks it before and after the intersection point; PA1 determining, for first end (A) of each edge, the number of facets that mask this first end; PA1 determining the segments of this edge that are visible and those that are hidden, by determining the number of facets that mask each segment, from the n…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.