Method for displaying a portion of the body
US5222201A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1989 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Oct 31, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T17/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The problems of selection of objects having complex shapes and usually apprehended by a plurality of facets are solved by making use of curved surfaces, the equation of which is of the second degree. In a test calculation for checking whether a node of an octree decomposition does or does not belong to the surface thus defined, the terms of the second degree are replaced by a constant. It is shown that this approximation permits rapid determination of the complex shapes without having to perform the calculations corresponding to the second degree. The method also permits easy determination of the normal to the object for calculation of shadowing when it is employed for display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.