Prof. Dr. Les Piegl University of South Florida Department of Computer Science and Engineering Fowler Avenue, ENG uS Tampa, FL 33620-5399, USA

Dr. Wayne Tiller GeomWare, Inc. 3036 Ridgetop Road Tyler, TX75703-89o6, USA

ISBN 3-540-61545-8 2nd ed. Springer-Verlag Berlin Heidelberg New York !SBN 3-540-55069-0 1st ed. Springer-Verlag Berlin Heidelberg New York

Cip data applied for Die Deutsche Bibliothek - CIP-Einheitsaufnahme Piegl, Les: The NURBS book I Les Piegl; Wayne Tiller.- 2. ed. -Berlin ; Heidelberg; New York; Barcelona; Budapest; Hong Kong; London; Milan; Paris; Tokyo: Springer, 1997

(Monographs in visual communications) ISBN 3-540-61545-8

NE: Tiller, Wayne

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Cover design: Design & Production, Heidelberg Typsesetting: Nancy A. Rogers, NAR Assoc., Annapolis, MD, using TEX SPIN: 10691934 33/3020-5 4 3 2- Printed on acid -free paper

To the memory of my mother Anna, and to my father Janos

L.P.

To my grandmother, Fern Melrose Bost, and to the memories of

my grandparents, James Raney Bost, Pearl Weeks Tiller,

and Albert Carroll Tiller

W. T.