Surface parametrization


by chaotixmonjuish
Tags: parametrization
chaotixmonjuish
chaotixmonjuish is offline
#1
Nov6-10, 01:55 AM
P: 287
I'm having problems understanding surface parametrization from differential geometry.

We are given two general forms for parametrization:
[tex]\alpha[/tex](u,v) = (u,v,0)
and x(u,v)=(u,v,f(u,v))


This is one I'm especially stuck on:

y=Cosh(x) about the x-axis

[tex]\alpha[/tex](u,v)=(u, Cosh[v],0)

x(u,v) = (u, Cosh[v]cos(u), Cosh[v]sin(u))

I think that's right.
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arkajad
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#2
Nov6-10, 04:29 AM
P: 1,412
I do not understand the notation in these "general forms". Which textbook are you using?
tiny-tim
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#3
Nov6-10, 05:00 AM
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hi chaotixmonjuish!

(have an alpha: α and a theta: θ )
Quote Quote by chaotixmonjuish View Post
y=Cosh(x) about the x-axis

[tex]\alpha[/tex](u,v)=(u, Cosh[v],0)

x(u,v) = (u, Cosh[v]cos(u), Cosh[v]sin(u))
are you talking about the surface of revolution obtained by rotating y = coshx about the x-axis?

if so, if one of your parameters (u) is equal to x, then the other sensible paramter to choose would be θ, an angle round the x-axis

(so you'll get a nice "square-ish" (x,θ) grid on the surface)

anyway, your y will always be cosh(u), won't it, not cosh of some other parameter v ?


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