Subject:
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Re: MPD spec
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 8 Mar 2000 12:44:04 GMT
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Reply-To:
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Rui.Martins@link.+stopspam+pt
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Viewed:
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885 times
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On Mon, 6 Mar 2000, Paul Gyugyi wrote:
> In lugnet.cad.dev, Rui Manuel Silva Martins writes:
> > This is My proposition for changing the MPD format:
> > (how to build My proposition MPD)
>
> I understand your proposal, but it has the bad side effect of
> requiring a double-pass through all the files.
I'm sorry bu this is NOT true !
Also my suggestion to the MPD format only assumes an implicit (0 FILE
model.dat) at the begining of the file. so the processing is almost
exactly the same as before.
> For example, if the first line of your file is:
> 1 1 0 0 0 1 0 0 0 1 0 0 0 1 foo.dat
> and foo.dat is not found in the search path, the rendering
> program does not know whether to print an error message or
> do a complete pass through all the files to see if there
> is a "0 FILE foo.dat" line later.
The current (the one beeing used now) MPD format also requires you to
search the rest of the MPD file for files, since the main model file is
defined as the first file defined in a (0 FILE filename) metacommand.
So as I said before, processing is almost exactly the same, just the error
checking in the begining is NOT required (to check that NO commands are
issued before the first (0 FILE filename) meta command).
> Personally, if we were to change .MPD, I'd prefer a
> "0 DEFINE foo.dat" and "0 DEFINE END" delimiters,
> and require they be at the start of the file, with drawing
> commands for the main part coming at the end. This would
> make it easier to distribute parts libraries, do pre-caching
> of files, and redefine parts.
That ideia about part libraries is interesting ! we could just use a
regular MPD, but with a different extension (.DLB ? for Dat LiBrary )
And we would have to find a way to inform the rendering/editing program to
used the specific (.DLB) library file.
You can do caching as you read the MPD file as it is today or with my
sugestion, it's easy.
the ideia of redefine parts, if I understood it correctly, can be
implemented easily, by search for a file in the MPD first, and only if not
found than search in the LDRAW dirs. This would be the way I would do the
search, at least for a MPD.
see ya.
Rui Martins
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Message is in Reply To:
 | | Re: MPD spec [DAT]
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| (...) I understand your proposal, but it has the bad side effect of requiring a double-pass through all the files. For example, if the first line of your file is: 1 1 0 0 0 1 0 0 0 1 0 0 0 1 foo.dat and foo.dat is not found in the search path, the (...) (25 years ago, 6-Mar-00, to lugnet.cad.dev)
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