Subject:
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Re: LDraw DAT certification for clones?
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Tue, 14 Dec 1999 16:19:15 GMT
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Viewed:
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793 times
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Todd (not admin@lugnet.com :-) wrote:
> Say, has anyone considered LDraw DAT file certification
> for clones? (I don't mean clone brands of LEGO bricks, I
> mean clone software of LDraw/LEdit/etc.)
Considered, yes. Done something, no.
> ldraw.org could maintain the official definition of the
> LDraw DAT file format
We try to do that already.
> and certify (or allow clone authors to self-certify their)
> software packages which import or export LDraw DAT files.
How do we do that?
> The definition could say things like: a program which
> writes LDraw DAT files -must- output LDU coordinates as
> decimal integers or IEEE floating-point numbers, -may-
> output these numbers to high precision, but -should- round
> them to at most 2 significant digits past the decimal
> point.
I am not sure that the BP7 floating-point format exactly
matches the IEEE format, but I will look it up.
> And there could be a few sample files for regression
> testing and that sort of thing.
Yes.
Also for easy testing of the different rendering features
(soon including the BFC extensions).
> This way, packages like MLCad and LeoCAD (and clones like
> LDLite) would have some sort of official working
> definition of the file format,
Yes.
I have thought of using something like the l3p check feature
as an official file format testing tool.
> and inasmuch as certification doesn't mean a whole lot
> from the "Hey, wow, it's certified!" wowie zowiee point of
> view, I think may encourage more careful attention to
> details and conventions.
That would be good.
Play well,
Jacob
------------------------------------------------------------
-- E-mail: sparre@cats.nbi.dk --
-- Web...: <URL: http://hugin.ldraw.org/LEGO/Skibe/ > --
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Message has 1 Reply:
 | | Re: LDraw DAT certification for clones?
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| (...) Borland Pascal, Borland C/C++, and Microsoft C/C++ all use the IEEE format for floating point numbers (float, double and extended are all IEEE defined) because these are the formats supported by the 80x87 line math coprocessors. (Even though (...) (25 years ago, 3-Jan-00, to lugnet.cad.dev.org.ldraw)
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