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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Mon, 10 May 1999 22:13:54 GMT
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Viewed:
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710 times
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onyx <onyx@flash.net> wrote in message news:FBJEHG.E04@lugnet.com...
> In lugnet.cad.dev, John VanZwieten writes:
> >
> > -John Van
>
> i'm not sure if you and steve are completely clear on what terry and i are
> concerned about... and even if the two of you are, i'll lay it out for
> everyone else that might be hazy on why this "compression" "no compression"
> "scaling" etc etc etc thing is such an issue..
>
>
> the cross-section of the spring coil itself is a small circle (actually it's
> modelled as a diamond, i kept its facet count low to minimize the number of
> faces in the overall spring)...
> this cross-section is like... 1 LDU diameter (i'm not at home right now so i
> can't open the .DAT's to check exactly, but go with me on this...)
> the spring coil was created by "lofting" this circular cross section along a
> helix... the helix ends about 10 LDU higher than its start point...
>
> now we can scale the coil so that the helix only climbs 8 LDU or 5 LDU..
> whatever you want.. so that 10 total coils only span 50 LDU instead of 100
> like they do in the "relaxed" or "uncompressed" state...
>
> that's the easy part.. the problem is that when you apply this scaling to the
> coil you are not just applying that calc to the distance the helix climbs, • you
> are also distoring the cross section of the spring itself.. so now a spring
> that is compressed to half its normal length would render with a flattened
> circle (oval) cross-section....
>
> make sense??
Yup, undoubtedly more than my attempt at explaination. I think if you gave us
correctly scaled coils at 100 LDU, 80 LDU, 60 LDU, and 50 LDU, we could use
compression to make springs length 50-100 LDU while only distorting the
cross-section of the coil by ~15% maximum. I doubt anyone could tell the
difference on a circle of 1 LDU diameter.
For example if I needed a spring length 72 LDU, I would use the 80 LDU versions
scaled by .9 on the y axis.
-John Van
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Message has 1 Reply:
 | | Re: Discussion-Large Technic Shock 2909c01.dat
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| (...) versions (...) btw, after i posted i came across another message of yours where you *had* grasped the rub in this situation... hmmm... i think that might be a decent idea... modeling various compressions would be painless.. i could tear them (...) (25 years ago, 10-May-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Discussion-Large Technic Shock 2909c01.dat
|
| (...) i'm not sure if you and steve are completely clear on what terry and i are concerned about... and even if the two of you are, i'll lay it out for everyone else that might be hazy on why this "compression" "no compression" "scaling" etc etc etc (...) (25 years ago, 10-May-99, to lugnet.cad.dev)
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