Subject:
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Re: No mention of scale in file format doc
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Fri, 25 Feb 2005 13:52:12 GMT
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Viewed:
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1042 times
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In lugnet.cad.dev.org.ldraw, Steve Bliss wrote:
> In lugnet.cad.dev.org.ldraw, Orion Pobursky wrote:
> > In lugnet.cad.dev.org.ldraw, Ross Crawford wrote:
> > > Regarding the proposed file format document:
> > >
> > > There is no mention of the scale used by the x/y/z triplets in the various
> > > linetypes. I would suggest there should be a paragraph introducing the concept
> > > of LDU, and how it relates to bricks and "real life" measurements (inches, cm).
> > > Just to make the doc more complete, do you agree?
> >
> > Have a look now:
> > http://www.ldraw.org/article/218
> >
> > I added LDU and quad winding.
>
> Quoting the some of the new winding material:
>
> "The points of the quadrilateral must be declared in either a clockwise or
> counter-clockwise order (see above example images)."
>
> The basic file format specification should not include any mention of winding,
> except maybe "specific winding is not required (but it is a good thing). If you
> are interested, check out the BFC spec <link>".
All BFC requires is uniform, non-bowtie winding. While currently the spec
doesn't require winding, I see no reason not to revise the new spec to make it a
requirement. On the flip side there are many file still left in the loibrary
with a bowtie winding so changing the spec before we fix those parts might not
be prudent.
> In particular, a somewhat mysterious diagram labeled "bad" is more confusing
> than helpful, IMO.
True, It was just something I whipped up in a rush with the intention of making
a better example later.
-Orion
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Message has 1 Reply:
 | | Re: No mention of scale in file format doc
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| (...) But what's required by/for the parts library is different from what the basic file format spec lays out. I think it is better (more flexible, easier to write) for the file format to be flexible. When I'm doing rough coding of new parts, I (...) (20 years ago, 25-Feb-05, to lugnet.cad.dev.org.ldraw)
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Message is in Reply To:
| | Re: No mention of scale in file format doc
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| (...) Quoting the some of the new winding material: "The points of the quadrilateral must be declared in either a clockwise or counter-clockwise order (see above example images)." The basic file format specification should not include any mention of (...) (20 years ago, 25-Feb-05, to lugnet.cad.dev.org.ldraw)
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