Subject:
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Re: Parts Library Posted to ldraw.org
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Sun, 18 Jun 2000 10:01:34 GMT
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Viewed:
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757 times
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In lugnet.cad.dev.org.ldraw, Steve Bliss writes:
> There has been some talk about serving LDraw parts directly from ldraw.org,
> mostly to allow rendering programs to fetch part-files over the internet.
>
> To get a start on such a service, the parts library has been made available
> via http (it's not quite current, the 2000-01 update is not posted yet). To
> get a file from the online parts library, you need to go after a URL of the
> form:
>
> http://www.ldraw.org/library/dat/<file>
>
> Where <file> is the filename as it is referenced in a DAT file.
Good Idea.
> Part-files and primitives have been combined into one location, instead of
> being stored in two different locations. This should save a bit on 404
> errors, which would occur if programs had to try two different paths for
> files.
I can assume any name clashes have been sorted out?
And of course there is the perreinal case-sensitvie file name problem nowe
that theres LDGLIte on LINux as well...
> For now, that's all there is: the files are hanging around, and you can
> retrieve them, if you know what you're looking for.
>
> Jacob and I have exchanged a few e-mails on how this feature could be • developed,
> I've listed some ideas below.
>
> 1. A list of available parts. This is pretty straightforward, it would only
> require posting a version of parts.lst to the /library/ folder.
Yes.
> 2. A mechanism to retrieve multiple files in one request. The client would
> have to provide the list of files, maybe something like:
>
> http://www.ldraw.org/library/getblock?f=3001.dat,3002.dat,3003.dat ...
Or bypass this entirly and work with IP packets directly!
> 3. A mechanism to query on the current library release number. This might be
> just another file in the /library/ folder.
Yes, needed another CGI script?
>
> 4. A streaming parts update. This would require a certain amount of • groundwork,
> because we'd need to have a way of 'posting' file updates to the stream, and • the
> client would need a way to ask for any available updates.
Try looking at a system called Soft CD.
> Anybody got other ideas? I'm not an internet-communications guru, so I'd be
> interested in geekier approaches to any of this. :)
Well from a Computing student here in the UK, here are some ideas:
work using http::/ request as above- might be cumbersome but easy to do.
Use SoftCD from a central server. Not good. Limits on what can be done.
Proprietay technology.
Write and publish a protocol standard to be implmented in furure DAT browsers.
When writing or adpating a DAT browser the code to do multiple part requests
over the net could be built into the code! Most OS-Platforms now suppourt BSD
style Sockets?
Of course to do that would need a protocol standard... As well as a custom
written server. Know any C programmers? :-(
Another technology you might wnat to examine is the Common Object Resource
Broker Architecture. This is a framework used for development of Distributed
Systems. It is now an international standard. I also see To recall that a
number of freeware tools for working with it were availble on the net...
Alex
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Message has 1 Reply:
Message is in Reply To:
 | | Parts Library Posted to ldraw.org
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| There has been some talk about serving LDraw parts directly from ldraw.org, mostly to allow rendering programs to fetch part-files over the internet. To get a start on such a service, the parts library has been made available via http (it's not (...) (25 years ago, 10-May-00, to lugnet.cad.dev.org.ldraw)
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