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Curves and Surfaces for Computer Graphics by David Salomon

By David Salomon

Special effects is critical in lots of parts together with engineering layout, structure, schooling, and machine paintings and animation. This e-book examines a big selection of present tools utilized in developing real-looking items within the computing device, one of many major goals of special effects. Key good points: * stable foundational mathematical advent to curves and surfaces; no complicated math required * themes geared up by way of diversified interpolation/approximation innovations, every one technique providing beneficial information regarding curves and surfaces * Exposition influenced through a number of examples and routines sprinkled all through, assisting the reader * contains a gallery of colour photographs, Mathematica code listings, and sections on curves & surfaces by refinement and on sweep surfaces * website maintained and up-to-date through the writer, offering readers with errata and auxiliary fabric This attractive textual content is geared to a huge and common readership of laptop science/architecture engineers utilizing special effects to layout items, programmers for machine gamemakers, utilized mathematicians, and scholars majoring in special effects and its purposes. it can be utilized in a school room surroundings or as a basic reference.

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These properties are all local and they vary from point to point on the curve. 6 Curvature and Torsion 27 They are therefore functions of the parameter t. Notice that these properties exist for all curves, but the discussion here is limited to parametric curves. ” He applied himself to the tangent, the straight line that grazes the curve at any point. The straight line that the curve would become at that point, if it could be seen through an infinitely powerful microscope. 1 Normal Plane The normal plane to a curve P(t) at point P(i) is the plane that’s perpendicular to the tangent Pt (i) and contains point P(i).

12b shows vector nl, which is the projection of Ptt (t) (vector nm) onto P (t). 8) tells us that the length of nl is t Ptt (t) • Pt (t) . |Pt (t)| Since nl is in the direction of Pt (t), we can write the vector nl as nl = Ptt (t) • Pt (t) Pt (t) Ptt (t) • Pt (t) t P (t). · = |Pt (t)| |Pt (t)| |Pt (t)|2 We denote the vector lm by K(t) and compute it from the relation nl + lm = nm = Ptt (t): Ptt (t) • Pt (t) t K(t) = Ptt (t) − nl = Ptt (t) − P (t). 18) |Pt (t)|2 The principal normal vector N(t) is a unit vector in the direction of K(t), so it is given by K(t) N(t) = .

5 PC Curves 23 The four quantities involved in the calculation of the curve are therefore P(t) = at3 + bt2 + ct + d, dP(t) = 3a t2 ∆ + 2b t∆ + c∆ + 3a t∆2 + b∆2 + a∆3 , ddP(t) = 6a t∆2 + 2b∆2 + 6a∆3 , dddP = 6a∆3 . They have to be calculated at t = 0 before the loop starts, then each iteration computes the first three quantities from those of the previous iteration (dddP doesn’t depend on t). Here are the details P(0) = d, dP(0) = a∆3 + b∆2 + c∆, ddP(0) = 6a∆3 + 2b∆2 , dddP = 6a∆3 . P(∆) = a∆3 + b∆2 + c∆ + d = P(0) + dP(0), dP(∆) = a∆3 + 2b∆2 + c∆ + 3a∆3 + b∆2 + a∆3 = dP(0) + ddP(0), ddP(∆) = 6a∆3 + 2b∆2 + 6a∆3 = ddP(0) + dddP, ··· P([i + 1]∆) = P(i∆) + dP(i∆), dP([i + 1]∆) = dP(i∆) + ddP(i∆), ddP([i + 1]∆) = ddP(i∆) + dddP.

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