(12) United States Patent ao) Patent No.: us 6,507,340 Bi
Yamaguchi et al. (45) Date of Patent: Jan. 14,2003
(54) METHOD OF DISPLAYING THREEDIMENSIONAL OBJECT TO MAKE A PART OF A HOLLOW SHELL TRANSPARENT
(75) Inventors: Hiroshi Yamaguchi, Tokyo; Hiroshi Maruyama, Fukuoka, both of (JP)
(73) Assignee: NEC Corporation, Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/572,962
(22) Filed: May 18, 2000
(30) Foreign Application Priority Data
May 19, 1999 (JP) 11-139281
(51) Int. CI.7 G06F 15/00
(52) U.S. C I 345/421
(58) Field of Search 345/419, 420,
345/421, 422, 619, 620
