Subject:
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Re: Discussion-Large Technic Shock 2909c01.dat
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 11 May 1999 02:37:25 GMT
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Viewed:
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678 times
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On Mon, 10 May 1999 16:41:02 GMT, "John VanZwieten"
<john_vanzwieten@email.msn.com> wrote:
>
> > Terry wrote about scaling the spring:
> >
> > > I fear that doing it that way might result in some very noticeable flaws.
> > > The upper and lower ends of the spring would be nicely proportioned, but
> > > the center of the spring - where it was stretched or compressed - would
> > > appear odd. The spring would no longer be round. It would appear to be
> > > oval instead.
> > > What would the transition point between round and oval look like?
> >
> > I do not understand why this should happen. When I scale/compress a spring
> > in the direction of its main axis only, in the real word as well as in the
> > virtual word, the cross section still remains circular, doesn't it ?
> >
> > Greetings, M. Moolhuysen.
>
>
> It took me a while to bend my mind around this one, but now I see Terry's
> point. Think of a cross-section of the metal of the spring itself what you
> would see if you snipped it with wire-cutters (perish the thought). You would
> see a circle on the x-y plane. If you compress the whole spring in the y
> direction, you also compress the circular cross-section of the wire, which
> would make it an oval.
>
> I rather doubt this would be too obvious in LDraw, but in a POV'ed close-up it
> could look strange, exp. where the compressed part of the spring meets the
> uncompressed part.
>
> I still think the value of allowing any-length springs outweighs the POV
> distortion problem. Including correct springs of several lengths would
> minimize the required compression, too. If you included springs at fully
> extended, fully compressed, and two intermediate lengths, I bet you could
> reduce distortions to a barely detectable level.
>
> -John Van
I am glad we have all you deep-thinkers working on this. I Jeff is willing, I
think we should do some testing of the various methods. Find out which one is
best overall.
As John said, having several pre-made lengths that are properly modeled, and
then using a small amount of scaling, may well make the best overall
appearance. I would like to try it and see - especially in POV where the
appearance counts most.
Jeff's idea of doing it basically as he has it now, by building up the correct
length using loops, has the drawback of having too many or to few loops for a
given length. Workable, but how does it look?
-- Terry K --
BTW, thanks Jeff for all the work. :-)
BTW2, Gawd, I love those tires. :-)
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Message is in Reply To:
 | | Re: Discussion-Large Technic Shock 2909c01.dat
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| (...) It took me a while to bend my mind around this one, but now I see Terry's point. Think of a cross-section of the metal of the spring itself what you would see if you snipped it with wire-cutters (perish the thought). You would see a circle on (...) (26 years ago, 10-May-99, to lugnet.cad.dev)
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