Subject:
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Re: Ldraw.Org Spec 1.0.0 Page
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Newsgroups:
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lugnet.cad.dev
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Date:
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Thu, 1 May 2003 15:36:50 GMT
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Viewed:
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941 times
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In lugnet.cad.dev, Orion Pobursky wrote:
> The ultimate aim of the LSC is to compile and consolidate all of the LDraw
> related file format definitions into one document (1.0.0) and then, once the
> initial work is done, solicit ideas to further extend or modify the file format.
I'm not sure about the 'into one document' part, but I'll agree with the
rest.
More basically, we've got a number of different 'flavors' of the LDraw
language floating around. I think it would be most useful to have one
or more documents that outline specific flavors of the language. The
0.27 and 1.0.0 document approach is a good start.
As I see it, here are some of the dialects of the LDraw GDL:
- The core LDraw language, consisting of the definition of the six
linetypes (comments, subfiles, hard edges, triangles, quads, and soft
edges).
- The base language implemented by LDRAW.EXE and LEDIT.EXE, which
includes the core language + the defined search path + the STEP, SAVE,
PAUSE, PRINT/WRITE, and CLEAR/CLS meta-statements. This flavor (or
dialect or layer) defines the part library, the p-file resource, and
provides a break between model files and part files.
- Compatible extensions to the language -- this is the base language +
other meta-statements. Files which use compatible extensions can
still be successfully rendered by LDRAW/LEDIT. Examples of compatible
extensions include the LDLite COLOR meta-statement, the IFL3P
meta-statement family, the standard LDraw.org part file header, and
BFC.
- The language allowed in official part files. This is a subset of the
compatible extensions. Most meta-statements are not allowed, even
those that are in the base language. Also, there are restrictions on
color usage and subfile referencing that don't apply to the language
in general.
- Incompatible extensions to the language. These are variations of the
compatible language that result in files that can not be rendered in
LDRAW/LEDIT. There are actually several different incompatible
extensions, because the different extensions are not all
cross-compatible. Examples of incompatible exensions include the MPD
format, MLCAD colors, and various LDLite language extensions.
> That said, having tow separate documents, 1.0.0 for meta commands which is
> modifiable by the LSC and 0.2.7 for the LDraw/LEdit program which is fixed,
> would not allow the LSC to, say, add a linetype for polygons or modify the
> way we define colors. Have one large document (or several small linked
> documents) would allow us to move forward much easier.
But having two layers, with a fixed base layer and a changed top layer,
is the actual situation we are in right now. Having two documents would
clearly document this.
However, we certainly could include the 0.27 documentation in the 1.0.0
document.
Any changes that would essentially break the existing language would be
a huge change in direction, and should be in yet another document
(2.0.0?). With the work Jacob did on LDraw II some years ago, we've
already got a start on such a document.
Steve
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Message has 1 Reply:
 | | Re: Ldraw.Org Spec 1.0.0 Page
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| (...) I know I didn't recall LDraw II until a couple months ago when you brought it up to me. My guess is at least the newer members in the community aren't too familiar with it either. Would you mind posting a link for everyone? Maybe I can throw (...) (21 years ago, 1-May-03, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Ldraw.Org Spec 1.0.0 Page
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| (...) Alright here's the deal. The ultimate aim of the LSC is to compile and consolidate all of the LDraw related file format definitions into one document (1.0.0) and then, once the initial work is done, solicit ideas to further extend or modify (...) (21 years ago, 1-May-03, to lugnet.cad.dev)
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