Subject:
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Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 28 Aug 2007 20:43:52 GMT
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Viewed:
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8283 times
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In lugnet.cad, Kevin L. Clague wrote:
> In lugnet.cad, Rob Ross wrote:
> > >
> > > I think it would be helpful to mention the used matrix in line type 1 is
> > > row orientated (more clearly then 'standard matrix').
> >
> > > Just my thoughts,
> > >
> > > Roland
> >
> > Is this really what the LDRAW spec is stating? Because that would be contrary to
> > the OpenGL spec, in which the standard ordering of matrices is column-major.
> >
> > So if you have a row like
> >
> > a b c d e f g h
> >
> > That would be interpreted in OpenGL as
> >
> > a e
> > b f
> > c g
> > d h
> >
> > and NOT
> >
> > a b c d
> > e f g h
> >
> >
> > Rob
>
> Hi Rob,
> Not to be indelicate, but LDraw was around *before* OpenGL. That said, I
> think the document *must* explicitly show something like this:
Let me restate the above.....because I think I'm wrong about the timeline.
LDraw is a stand alone specification, so what OpenGL expects is not relevent.
The LDraw specification must specify what its coordinate and matricies formats
mean, especially when derived from a string of numbers all on one line.
>
> a b c
> d e f
> g h i
>
> Furthermore I think the document must explain x, y and z. If I remember
> correctly above the origin, y is negative.
>
> Kevin
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