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:
Oct. 05, 1993
Filed:
Feb. 08, 1990
Peter L Doyle, Northboro, MA (US);
John P Ellenberger, Groton, MA (US);
Ellis O Jones, Andover, MA (US);
David C Carver, Medway, MA (US);
Steven D DiPirro, Holliston, MA (US);
Branko J Gerovac, Marlboro, MA (US);
William P Armstrong, Salt Lake City, UT (US);
Ellen S Gibson, Salt Lake City, UT (US);
Raymond E Shapiro, Marlboro, MA (US);
Kevin C Rushforth, West Valley City, UT (US);
William C Roach, Salt Lake City, UT (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A method and apparatus for operating a computer graphics system to perform a conditional test on a node in a graphics data structure during the traversal of the graphics data structure by a structure walker. The graphics system is operated to manipulate data contained in a memory to define a value for an operand that is to be tested. The system accesses the operand from the memory. A structure walker performs a test on the value of the operand during traversal of the graphics data structure. Depending upon the result of the test, the structure walker traverses one of several paths in the graphics data structure to create a graphics display.