Subject:
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Re: Modeling String
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 10 Apr 2002 04:06:21 GMT
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Viewed:
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1200 times
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In lugnet.cad, Larry Pieniazek writes:
> In lugnet.cad, Jason S. Mantor writes:
> > I'm working on a program that simlulates strings as braided coils and lots
> > of splines in POV-RAY. I'm tyring to get the catenary curves right so it
> > looks like it's tension is supporting it's weight.... Hopefully, I'll get
> > some time to finish it next week : )
>
> Well I just slapped together a primitive to simulate twisted string bits but
> am not all that pleased with it.
>
> The string I have in mind to model will be so tight that a straight line
> will be fine, no need for catenary curves (although it sure SOUNDS neat...,
> or at least close enough for POVray purposes.
>
> What are you using for primitives to model the individual sections of
> string? I used a square section that was twisted 45 degrees from one end to
> the other but that may not have been enough sides to get a good look. (my
> first ever "primitive" Yaay!)
Perhaps we could also have parts, like the hose segments so you have a
"String End" and "String section" (for want of better names). These could
possibly be cylinders with a "wound" or "braided" pattern on them, the end
section having 1 closed end (maybe with a little fraying!). You can add them
end-to-end to get the length you want, with a nice pattern all along it.
Then maybe Fredrik (or someone else) could even change his ldraw-mode
http://www.math.uio.no/~fredrigl/technic/ldraw-mode/ to do catenaries as
well as beziers 8?)
You might also want a "String knot" part.
ROSCO
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Message has 1 Reply:
 | | Re: Modeling String
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| (...) Incidentally, I have considered it. But so far I have concluded that the mathematics are too complicated for an analytical solution. And I am a bit tired of programming numerical optimalization.. Fredrik (24 years ago, 10-Apr-02, to lugnet.cad)
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Message is in Reply To:
| | Re: Modeling String
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| (...) Well I just slapped together a primitive to simulate twisted string bits but am not all that pleased with it. The string I have in mind to model will be so tight that a straight line will be fine, no need for catenary curves (although it sure (...) (24 years ago, 10-Apr-02, to lugnet.cad)
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