(19)

(11)

EP 1 620 821 A2

(12)

(88) Date of publication A3: 24.03.2005 (43) Date of publication: 01.02.2006 Bulletin 2006/05 (21) Application number: 04750337.0 (22) Date of filing: 20.04.2004

(51) International Patent Classification (IPC):  G06F 17/50(1995.01) G06T 17/30(1995.01) (86) International application number: PCT/US2004/012054 (87) International publication number: WO 2004/095322 (04.11.2004 Gazette 2004/45)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 21.04.2003 US 420539 (71) Applicant: UGS Corp. Plano, TX 75024 (US)	(72) Inventors: SRIPRADISVARAKUL, Thawach Ann Arbor, MI 48105 (US) TSAI, Yi-Feng Ann Arbor, MI 48105 (US) (74) Representative: Lawrence, John  Barker Brettell, 138 Hagley Road, Edgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)