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 21:15:02 GMT
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Viewed:
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4593 times
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In lugnet.cad, Travis Cobbs wrote:
> In lugnet.cad, Kevin L. Clague wrote:
> > Hi Rob,
> > Not to be indelicate, but LDraw was around *before* OpenGL. That said, I
> > think the document *must* explicitly show something like this:
>
> Actually, SGI released OpenGL in 1992, and (according to ldraw.org) James
> released LDraw in 1995. So OpenGL predates LDraw by 3 years.
>
> > Furthermore I think the document must explain x, y and z. If I remember
> > correctly above the origin, y is negative.
>
> Good point. You are correct that -y is "up". I don't see that anywhere in the
> spec, and it's quite important.
Also important is the fact that LDraw's model world is in a right-handed
coordinate system. The current draft doesn't mention this.
Steve
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