The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 1994
Filed:
Feb. 28, 1991
Applicant:
Inventors:
Kells A Elmquist, Lansing, NY (US);
David W Arsenault, Ithaca, NY (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395121 ; 395126 ; 395127 ;
Abstract
Shadow testing of a two dimensional projection of a three dimensional scene is accelerated by superimposing the projection with a plurality of scan areas, then examining points, and edges of objects, falling within each scan area. Points are identified as potentially shadowed points if bracketed by edges of any object, and the bracketing object is identified as a potential shadower of the potentially shadowed points. Potential shadowers and potentially shadowed points undergo a series of tests to rapidly determine which, if any, of the potential shadowers are actual shadowers of each potentially shadowed point.