Subject:
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Re: Mathematical assistance please
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Newsgroups:
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lugnet.cad.dev
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Date:
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Thu, 6 Jan 2005 21:31:48 GMT
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Viewed:
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2098 times
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In lugnet.cad.dev, Kevin L. Clague wrote:
> In lugnet.cad.dev, Ross Crawford wrote:
>
> <snip>
>
> > > My mistake.... I am using 4-4cyls.dat. rotating them to align them with the
> > > S0-S1-S2 plane is what I don't know how to do.
> >
> > It's hard work, but this page might help
> > http://mathworld.wolfram.com/RotationMatrix.html
>
> Rosco,
>
> Thanks again. I understand rotation matricies (to some degree), I just don't
> know how to come up with the rotation angle needed to twist the 4-4cyls.dat into
> the right position.
Could you transform the co-ordinate system so that one of it's axes is along the
centre-line of the 4-4cyls (in the plane S0-S1-S2), rotate it about that axis so
that the longest sise is in the plane, then transform the co-ord system back?
ROSCO
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Message has 1 Reply:
 | | Re: Mathematical assistance please
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| (...) Or maybe another way to look at it (got this from old lecture notes): Goal: rotate about arbitrary vector A by alpha Idea: we know how to rotate about X,Y,Z So, rotate about Y by beta until A lies in the YZ plane Then rotate about X by gamma (...) (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Mathematical assistance please
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| In lugnet.cad.dev, Ross Crawford wrote: <snip> (...) know how to come up with the rotation angle needed to twist the 4-4cyls.dat into the right position. One reason to push forward on my original solution is because the same knowledge can be used to (...) (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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