Subject:
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Re: 9V Curved Track
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Thu, 17 Apr 2003 19:46:52 GMT
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Viewed:
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1432 times
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In lugnet.trains, Cary Clark writes:
> In lugnet.trains, Ludo Soete writes:
> > In lugnet.trains, Cary Clark writes:
> > > In lugnet.trains, Ludo Soete writes: • ...
> > The 'zero' point is normally at the center of the part ...
>
> It's the 'normal' part that trips me up! Consider these parts:
>
> http://guide.lugnet.com/partsref/search.cgi?q=3063
> http://guide.lugnet.com/partsref/search.cgi?q=2357
>
> From a geometry point of view, these are pretty similar. But (according to
> MLCad) the center of the macaroni is the circle center; the center of the
> 2x2 'L' is the middle stud. (Note that they are not oriented the same way
> either.) Your center point matches the 2x2 'L' philosophy (the center
> bisects the part) but the orientation of curve isn't like either part; you
> rotate the curve so that the middle tie is axis-aligned.
The information i have abouth parts center comes from the LDRAW FAQ -
Question24 Steve Bliss writes :
Quote
Tip#1: The Ldraw standard for positioning is to the center of the piece on
X=0 and Z=0. Usually, the top of the part (excluding studs) is set to Y=0.
Unquote
If i do have a problem to figure out where i should take the centerpoint,
i'll ask Steve. Perhaps interesting for you is that the centerpoint of the
(hopefully) upcoming points is at the center of the straight track (in the
neighborhood of the fixation hole), not the center of the point itself.
>
<SNIP>
> > Whats the purpose for this data?
>
> I'm working on a program that works with LDraw data, but requires additional
> information, like how part geometry interconnects. I'll talk anyone's ear
> off about it offline, but I don't want to announce it in a public forum
> until it is closer to completion.
I agree with that.
>
> Cary
> FUT cad.dat.parts
Regards,
Ludo
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