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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Fri, 13 Sep 2002 13:32:03 GMT
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Viewed:
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429 times
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In lugnet.cad.dev, Kevin L. Clague writes:
>
> I'd like a mechanism that formalizes the definition of flexible parts, and
> allows for automatic synthesis. I envision the process working like this.
> We put a specification about the part we want synthesized into our design
> using MLCAD (or LEdit or whatever). The specifications are very specific
> about the LEGO part being used (e.g. light grey corrigated tube that starts
> here with this orientation and ends here with this orientation). When a
> "synthesis capable" program comes along it can replace the synthesis
> specification with the LDRAW parts needed. In the case of tubing, an
> algorithm (probably bezier curve fitting or whatever) will be used to
> specify all the segments' placement and orientation between the end pieces.
I think this would be very nifty!
>
> There are a number of tube like LEGO parts: electrical cables, pneumatic
> tubing, fiber optic cables, narrow and corrigated tubes for example. I
> think that all of these can be handled with the same synthesis algorithm,
> but the parameters provided depend on the LEGO part being synthesized.
> Examples of parameters include flexibility and the length of the LEGO part.
> Electrical cables are much more flexible than the corrigated tubing. There
> are at least five different length electrical cables. Pneumatic tubing can
> be cut to any length.
One other type of flexible part is string. Taut string should conform to the
shape of whatever it is wound on, leave tangentially, and have a linear path
to the other end. Slack string should conform to whatever it is wound on,
leave tangentially, and have a catenary curve to the other end. (with the
catenary curve being in a plane that is vertical and which goes through the
endpoints)
I did a string piece part which was a quick hack but which I used for the
instructions of MTW-1004... I did all my placement by hand.
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Message is in Reply To:
 | | Formalizing a method for handling synthesizable parts
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| I'm relatively new to the LDRAW CAD world, but am very impressed with all the work that has been done. It is amazing that we have such a huge parts database to work with. I've been working on a tool for publishing LDRAW based designs. It has been in (...) (22 years ago, 14-Sep-02, to lugnet.cad.dev) !
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