Subject:
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Re: Formalizing a method for handling synthesizable parts
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 9 Oct 2002 15:14:04 GMT
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Viewed:
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551 times
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Hi Philo,
I finally got my tangent between two circles code working! I can have two or
more pulleys (or pins), with them inside or outside the rubber band, and band
crossings.
Right now they all have to be in the XY plane. I'm working on the code to
rotate the specification into the XY plane, and then back to its original
location now.
I've actually not gotten into the synthesis of the bands yet, just drawing
straight lines from pulley to pulley.
I wrestled with it for quite a while and eventually figured out there was a
bug in the book I was using that told me how to calculate the the tangent
between to circles. It's formulas were correct, but the code it provided was
incorrect.
The actual band synthesis will be done like hoses, but no need for end
segments.
I know that crossed bands are non-planar ;-)
An example of the non-planar I was talking about is where the axis of pulleys
are not parallel. For example one pulley is perpendicular to another pulley.
This one will come much later (because it will take me a long time to figure
out the mat ;-)
Kevin
In lugnet.cad.dev, Philippe Hurbain writes:
> Hi Kevin,
>
> It seems you forgot to link in CC3250.DLL... doesn't work on my system.
>
> > Boy, were you right, the triangle synthesis took a 3K file and made a 2M
> > file. Unpalatable.
> >
> > I switched lsynth over to use LDRAW parts for synthesis. Now that 3K file
> > ends up to be 500K, still much larger, but certainly better than before.
>
> That's the kind of size I got... We must keep in mind that even if the ldraw
> file is smaller using parts, the number of triangle to render will be the
> same or even higher :c(
>
> The use of ldraw parts has an added benefit: it is more compatible with
> LeoCad (with triangles you would have to create a new part and import it in
> Leocad to be able to display something)
>
> > > I've got most of the algorithms for rubber bands with pulleys/pins inside or
> > > outside the bands as well as bands that have crossed over on themselves. I
> > > have not wandered through non-planar arrangements though.
>
>
> I began to code crossed bands in my rubberbelt generator, but other project
> kept me from finishing that. Note that crossed bands are not planar, there
> is the thickness of the band to consider !
>
> Cheers,
>
> Philo
> www.philohome.com
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