Subject:
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Re: Voting Open for LCAD Parts Update 2000-01
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 12 Apr 2000 13:52:27 GMT
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Viewed:
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1849 times
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"Fredrik Glöckner" wrote:
>
> I think I disagree with you. I've found the Bezier curves to be a
> good model for how the flexible axles bend in real life. But it is
> important to have a correct model for the flexible part in the first
> place. While the notched end parts are more rigid and bend less, the
> thin conenctors at the ends bend even more, more or less evening out
> the effect. So a model where the axle bends evenly over the whole
> length works quite good in my experience. I've used a "mock up"
> version of the flexible axles in this model:
I haven't tried any of this but wouldn't Hermite curves work better ?
Bezier curves don't need to go through the control points (except for
the endpoints) and Hermite curves also have the advantage of letting you
specify the tangent vector for the endpoints and any other places where
the axles have to fit.
> > How about if I write a program that inlines a part, and shapes it to fit
> > along a specified spline curve?
>
> A program? Do you mean an MSDOS program? Windows? Perl? I really
> think that we should aim beyond software compatibility with the LDraw
> parts library. It should be an entity providing enough information
> for it to be used on any kind of system, current and future, in my
> opinion. I realize that not all agree with me, though.
What about a program that takes as input the points where the axle has
to be and optionally the tangent vector at those points ? Shouldn't be a
great deal of work and can be done even for DOS (of course a GUI with a
preview would be much nicer).
Leonardo
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Message is in Reply To:
 | | Re: Voting Open for LCAD Parts Update 2000-01
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| (...) I think I disagree with you. I've found the Bezier curves to be a good model for how the flexible axles bend in real life. But it is important to have a correct model for the flexible part in the first place. While the notched end parts are (...) (25 years ago, 12-Apr-00, to lugnet.cad.dev)
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