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Journal of Computational and Applied Mathematics 102 (1999) 1–2

Preface

Computational methods in computer graphics is an area of increasing interest as computers become more powerful and more sophisticated mathematical methods are applied to problems in computer graphics. In this special issue, we present papers dealing with a variety of topics concerning com-putational methods in computer graphics. We hope that the readers of the Journal of Comcom-putational and Applied Mathematics will nd these papers interesting.

A brief synopsis of the papers follows.

The paper “An integral linear interpolation approach to the design of incremental line algorithms” by C. Yao and J.G. Rokne presents a unied treatment of incremental line-drawing algorithms including the well-known Bresenham’s algorithm.

The paper “Constructing parametric quadratic curves” by C. Zhang and F. Cheng gives a new parametrization of given planar points so that an interpolating quadratic spline can be found to interpolate those points. The new parametrization is compared with well-known parametrizations.

The paper “The generalised Cornu spiral and its application to span generation” by J.M. Ali, R.M. Tookey, J.V. Ball, and A.A. Ball generalizes the Cornu spiral and then shows how this new curve can be used to form a span between two given points.

The paper “G2 composite cubic Bezier curves” by M. Paluszny, F. Tovar, and R.R. Patterson

describes a method to produce G2 curves using rational Bezier cubic segments. The curves interpolate

to G2 data at a sequence of given points.

The paper “An automated curve fairing algorithm for cubic B-spline curves” by J.F. Poliako, Y.K. Wong, and P.D. Thomas presents a new criterion for identifying locations in a cubic B-spline where fairing should be applied and gives an automated fairing algorithm.

The paper “Interactive shape preserving interpolation by curvature continuous rational cubic splines” by C. Seymour and K. Unsworth shows how to interactively modify the shape of con-vexity preserving planar interpolating curves.

The paper “Voronoi diagram and medial axis algorithm for planar domains with curved bound-aries I. Theoretical foundations ” by R. Ramamurthy and R.T. Farouki shows how to construct the Voronoi diagrams and medial axes of a planar domain bounded by free-form curve segments. The authors are preparing a companion paper that deals with algorithmic and implementation details.

The paper “Approximation by ruled surfaces” by H.-Y. Chen and H. Pottmann presents a new method for approximating a given surface or scattered data points with a ruled surface.

The paper “Normals of the buttery subdivision scheme surfaces and their applications” by P. Shenkman, N. Dyn, and D. Levin gives explicit formulas for the normals to surfaces that are generated by the buttery subdivision scheme. The results are used for high quality rendering of such surfaces.

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2 Preface / Journal of Computational and Applied Mathematics 102 (1999) 1–2

We thank all the authors who submitted papers for their interest in this area; we thank all the referees for their eorts in evaluating and improving the papers; nally, we thank the editors of the Journal of Computational and Applied Mathematics for the invitation to do this special issue and for their help in putting it together.

D.S. Meek D.J. Walton

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