Dr. Back. Nov. 3, 2009
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1 Dr. Back Nov. 3, 2009
2 Please Don t Rely on this File! In you re expected to work on these topics mostly without computer aid. But seeing a few better pictures can help understanding the concepts. A copy of this file is at back/m1920
3 Paraboloid z = x 2 + 4y 2 The graph z = F (x, y) can always be parameterized by r(u, v) =< u, v, F (u, v) >.
4 Paraboloid z = x 2 + 4y 2 The graph z = F (x, y) can always be parameterized by r(u, v) =< u, v, F (u, v) >. Parameters u and v just different names for x and y resp.
5 Paraboloid z = x 2 + 4y 2 The graph z = F (x, y) can always be parameterized by r(u, v) =< u, v, F (u, v) >. Use this idea if you can t think of something better.
6 Paraboloid z = x 2 + 4y 2 The graph z = F (x, y) can always be parameterized by r(u, v) =< u, v, F (u, v) >.
7 Note the curves where u and v are constant are visible in the wireframe. Paraboloid z = x 2 + 4y 2 The graph z = F (x, y) can always be parameterized by r(u, v) =< u, v, F (u, v) >.
8 Paraboloid z = x 2 + 4y 2 A trigonometric parametrization will often be better if you have to calculate a surface integral.
9 Paraboloid z = x 2 + 4y 2 A trigonometric parametrization will often be better if you have to calculate a surface integral. r(u, v) =< 2u cos v, u sin v, 4u 2 >.
10 Paraboloid z = x 2 + 4y 2 A trigonometric parametrization will often be better if you have to calculate a surface integral. r(u, v) =< 2u cos v, u sin v, 4u 2 >.
11 Paraboloid z = x 2 + 4y 2 A trigonometric parametrization will often be better if you have to calculate a surface integral. r(u, v) =< 2u cos v, u sin v, 4u 2 >. Algebraically, we are rescaling the algebra behind polar coordinates where x = r cos θ y = r sin θ leads to r 2 = x 2 + y 2.
12 Paraboloid z = x 2 + 4y 2 A trigonometric parametrization will often be better if you have to calculate a surface integral. r(u, v) =< 2u cos v, u sin v, 4u 2 >. Here we want x 2 + 4y 2 to be simple. So x = y = 2r cos θ r sin θ will do better.
13 Paraboloid z = x 2 + 4y 2 A trigonometric parametrization will often be better if you have to calculate a surface integral. r(u, v) =< 2u cos v, u sin v, 4u 2 >. Here we want x 2 + 4y 2 to be simple. So x = y = 2r cos θ r sin θ will do better. Plug x and y into z = x 2 + 4y 2 to get the z-component.
14 Parabolic Cylinder z = x 2 Graph parametrizations are often optimal for parabolic cylinders.
15 Parabolic Cylinder z = x 2 r(u, v) =< u, v, u 2 >
16 Parabolic Cylinder z = x 2 r(u, v) =< u, v, u 2 >
17 Parabolic Cylinder z = x 2 r(u, v) =< u, v, u 2 > One of the parameters (v) is giving us the extrusion direction. The parameter u is just being used to describe the curve z = x 2 in the zx plane.
18 Elliptic Cylinder x 2 + 2z 2 = 6 The trigonometric trick is often good for elliptic cylinders
19 Elliptic Cylinder x 2 + 2z 2 = 6 r(u, v) =< 3 2 cos v, u, 3 sin v >=< 6 cos v, u, 3 sin v >
20 Elliptic Cylinder x 2 + 2z 2 = 6 r(u, v) =< 6 cos v, u, 3 sin v >
21 Elliptic Cylinder x 2 + 2z 2 = 6 r(u, v) =< 6 cos v, u, 3 sin v >
22 Elliptic Cylinder x 2 + 2z 2 = 6 r(u, v) =< 6 cos v, u, 3 sin v >
23 Elliptic Cylinder x 2 + 2z 2 = 6 r(u, v) =< 6 cos v, u, 3 sin v > What happened here is we started with the polar coordinate idea x = r cos θ z = r sin θ but noted that the algebra wasn t right for x 2 + 2z 2 so shifted to x = 2r cos θ z = r sin θ
24 Elliptic Cylinder x 2 + 2z 2 = 6 r(u, v) =< 6 cos v, u, 3 sin v > x = z = 2r cos θ r sin θ makes the left hand side work out to 2r 2 which will be 6 when r = 3.
25 Ellipsoid x 2 + 2y 2 + 3z 2 = 4 A similar trick occurs for using spherical coordinate ideas in parameterizing ellipsoids.
26 Ellipsoid x 2 + 2y 2 + 3z 2 = 4 A similar trick occurs for using spherical coordinate ideas in parameterizing ellipsoids. r(u, v) =< 2 sin u cos v, 2 sin u sin v, 4 3 cos u >
27 Ellipsoid x 2 + 2y 2 + 3z 2 = 4 r(u, v) =< 2 sin u cos v, 2 sin u sin v, 4 3 cos u >
28 Hyperbolic Cylinder x 2 z 2 = 4 You may have run into the hyperbolic functions cosh x = ex + e x 2 sinh x = ex e x 2
29 Hyperbolic Cylinder x 2 z 2 = 4 You may have run into the hyperbolic functions cosh x = ex + e x 2 sinh x = ex e x 2 Just as cos 2 θ + sin 2 θ = 1 helps with ellipses, the hyperbolic version cosh 2 θ sinh 2 θ = 1 leads to the nicest hyperbola parameterizations.
30 Hyperbolic Cylinder x 2 z 2 = 4 Just as cos 2 θ + sin 2 θ = 1 helps with ellipses, the hyperbolic version cosh 2 θ sinh 2 θ = 1 leads to the nicest hyperbola parameterizations. r(u, v) =< 2 sinh v, u, 2 cosh v >
31 Hyperbolic Cylinder x 2 z 2 = 4 r(u, v) =< 2 sinh v, u, 2 cosh v >
32 Saddle z = x 2 y 2 The hyperbolic trick also works with saddles
33 Saddle z = x 2 y 2 r(u, v) =< u cosh v, u sinh v, u 2 >
34 Saddle z = x 2 y 2 r(u, v) =< u cosh v, u sinh v, u 2 >
35 Hyperboloid of 1 Sheet x 2 + y 2 z 2 = 1 The spherical coordinate idea for ellipsoids with sin φ replaced by cosh u works well here.
36 Hyperboloid of 1 Sheet x 2 + y 2 z 2 = 1 r(u, v) =< cosh u cos v, cosh u sin v, sinh u >
37 Hyperboloid of 1 Sheet x 2 + y 2 z 2 = 1
38 Hyperboloid of 2-Sheets x 2 + y 2 z 2 = 1
39 Hyperboloid of 2-Sheets x 2 + y 2 z 2 = 1 r(u, v) =< sinh u cos v, sinh u sin v, cosh u >
40 Hyperboloid of 2-Sheets x 2 + y 2 z 2 = 1
41 Top Part of Cone z 2 = x 2 + y 2 So z = x 2 + y 2.
42 Top Part of Cone z 2 = x 2 + y 2 So z = x 2 + y 2. The polar coordinate idea leads to r(u, v) =< u cos v, u sin v, u >
43 Top Part of Cone z 2 = x 2 + y 2 So z = x 2 + y 2. The polar coordinate idea leads to r(u, v) =< u cos v, u sin v, u >
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