Curves and Surfaces for Computer Graphics - download pdf or read online

By David Salomon

ISBN-10: 0387241965

ISBN-13: 9780387241968

ISBN-10: 0387284524

ISBN-13: 9780387284521

Computer photographs is critical in lots of parts together with engineering layout, structure, schooling, and machine artwork and animation. This e-book examines a wide range of present equipment utilized in developing real-looking gadgets within the computing device, one of many major goals of laptop graphics.

Key features:

- sturdy foundational mathematical creation to curves and surfaces; no complex math required

- issues equipped via assorted interpolation/approximation innovations, each one method supplying worthy information regarding curves and surfaces

- Exposition prompted through a number of examples and workouts sprinkled all through, supporting the reader

- encompasses a gallery of colour pictures, Mathematica code listings, and sections on curves and surfaces via refinement and on sweep surfaces

- site maintained and up to date by means of the writer, supplying readers with errata and auxiliary material

This attractive textual content is geared to a vast and normal readership of machine science/architecture engineers utilizing special effects to layout gadgets, programmers for laptop gamemakers, utilized mathematicians, and scholars majoring in special effects and its purposes. it can be utilized in a school room surroundings or as a normal reference.

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Extra info for Curves and Surfaces for Computer Graphics

Example text

Pt (t)∆ + This seems a failure since dP is a function of t (it should therefore be denoted by dP(t) instead of just dP) and is also slow to calculate. However, the original PC curve P(t) is a degree-3 polynomial, whereas dP(t) is only a degree-2 polynomial. This suggests a way out of our difficulty. We can try to express dP(t) by means of the Taylor series, similar to what we did with the original curve P(t). This should result in a forward difference ddP(t) that’s a polynomial of degree 1 in t.

The function P(u, w) describes a surface, since it is a function of the two independent parameters u and w. For any value of the pair (u, w), the function computes a weighted sum of the quantities Pij . These quantities—which are normally points, but can also be vectors—are triplets, so P(u, w) returns a triplet (x, y, z) that are the three-dimensional coordinates of a point on the surface. When u and w vary over their ranges independently, P(u, w) computes all the three-dimensional points of a surface patch.

18a). Since there are four such curves, our surface is a patch that has a (roughly) rectangular shape. Of special interest are the four quantities P(0, 0), P(0, 1), P(1, 0), and P(1, 1). They are the corner points of the surface patch and are sometimes denoted by Pij . 2) lies on the surface in the u direction. It is an isoparametric curve. Similarly, any curve P(u0 , w) where u0 is fixed, lies in the w direction and is an isoparametric curve. These are the two main directions on a rectangular surface patch.

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Curves and Surfaces for Computer Graphics by David Salomon


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