Subject:
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MPD file loading search order
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 25 Jul 2006 16:04:44 GMT
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Viewed:
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2242 times
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Hello All,
I'm implementing a LDraw file loader and was wondering about some
details concerning mpd. I could not found enough info about this
elsewhere, or I may overlooked it.
[1]
When loading a MPD file should I keep checking the first level of
subparts when some nested part references a part with an name present in
the top level mpd.
Example a mpd contains, a.dat, b.dat, c.dat and d.dat.
a.dat references b.dat, c.dat, d.dat and hello.dat
Hello.dat is searched in the same directory as the mpd, if found it's
opened and is something like:
1 x x x x x...... b.dat
1 x x x x x...... foo.dat
Should b.dat be loaded from the parent mpd or should I check directories
as if it's the first opened dat file, so:
1: same dir as part
2: ldraw directories.
3: not found error
[2]
Second point I'm unclear of what to do with nested MPD's, is this
allowed at all?
[3]
Last point, Are all dat's potential MPD files or must they be named
.MPD. I read somewhere about two pass loading, but this is not needed if
only .MPD files are multi part.
[--------]
Hope someone can give me some pointers about these issues.
Greetings,
Roland
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Message has 5 Replies:
 | | Re: MPD file loading search order
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| (...) Tim pointed you at the actual MPD spec. You may notice that is is vague on a lot of points -- it basically leaves it up to the program authors. My comments below are what makes sense to me, thinking as someone who might create complex MPDs. (...) (18 years ago, 25-Jul-06, to lugnet.cad.dev)
| | | Re: MPD file loading search order
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| As you have pointed out, the spec is indeed ambiguous. Consequently, there's probably no correct answer as to how things should work. However, I can tell you what I do in LDView, so that you have an idea of how at least one MPD-compatible program (...) (18 years ago, 25-Jul-06, to lugnet.cad.dev, FTX)
| | | Re: MPD file loading search order
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| Thanks Tim and Steve, I think I will go with Steve's advise to let only the main part in the mpd see the other parts in the mpd. This will give a much cleaner recursive approach, in which I can easily support sub mpd's. Further more I think I will (...) (18 years ago, 25-Jul-06, to lugnet.cad.dev)
| | | Re: MPD file loading search order
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| (...) I mentioned in my other (long) post that I don't think that MPD files should be required to have a .mpd extension. However, I'd like to add more here in answer to your specific question. I could be wrong, but I'm almost positive that it is (...) (18 years ago, 25-Jul-06, to lugnet.cad.dev)
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