Subject:
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Re: A comprehensive LDraw object model
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sun, 10 Feb 2002 04:41:39 GMT
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Viewed:
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472 times
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How about an LDraw DAT model reducer - something that hacks out the insides
and leaves nothing but a hollow shell? This way you could port it to
platforms that can't handle so many polygons, and also render in realtime.
It would kind of be like carving out the insides of a pumpkin.
-Mike
In lugnet.cad.dev, Jeremy H. Sproat writes:
> Hey folks,
>
> I think we need to figure out a comprehensive LDraw object model. Something
> that can be presented simply, and easily ported to various modern
> programming languages. A comprehensive class diagram would be a great
> start, and some code to illustrate behavior, too. To include datfile line
> types, a basic datfile collection type, minimum essential matrix and vector
> math, rudimentary (generic?) bitmap generation from DAT content, etc.
> (Maybe not too much, let's keep it lean and mean.) At the least, I think we
> should make the object model workable in C++, Java, Perl and Python.
>
> I have a modest start on an object model for Java in the works for my own
> use, but I think that if we all pool our efforts, we can enable a wide array
> of LDraw tools to be made quickly and easily. Over the past week, I
> implemented a datline class hierarchy and various matrix and vector math
> classes. After that was about 90% finished, here's what I was able to write
> in LESS THAN HALF A DAY (check out the window titled "xjjld - Jeremy's Java
> LDraw", lower left corner):
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=115962
>
> (Note: there is absolutely NO Java3D in that program. And it's even kinda
> fast. So far... for smallish models... with no filled polygons... ;-)
>
> I was writing this stuff JUST to make a model inliner for my instructions
> generator. But there's obviously so much more that can be done with a good
> core library. Datfile renderer, datfile editor, datfile filters, quick &
> painless datfile scripting, translator for various other file formats, etc.
> LDrawSript can be implemented over a Perl or Python back-end. Web servers
> can deliver rendered DAT images quickly & painlessly. I'm sure the
> possibilities have a limit, but it'd be a pretty dang high limit.
>
> This could be the way to get LDraw to work on everyone's computer who wants
> it. Mac, BSD, Linux, Solaris, they all have the above languages available
> *with* decent GUI libs to boot. This wouldn't necessarily compete with what
> we have now -- there are some really good tools out there already -- but it
> would encourage code generation in the LDraw community.
>
> If the LDraw community can pool their efforts into providing at least an
> object model for LDraw parts and functionality, or at best a reference
> implementation in the four languages I mentioned above, I feel that this
> would open the doors for those programmers who want to contribute but are
> intimidated by having to reinvent the wheel for even simple LDraw tasks.
>
> Comments? Concerns? Ideas? Please respond and let me know what you think.
>
> Cheers,
> - jsproat
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Message has 1 Reply:
 | | Re: A comprehensive LDraw object model
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| (...) Actually this brings up a different issue. I haven't put alot of thought into it yet, but I think it would be useful to add information in the part files that would allow a program to differentiate between geometry that represents 'outside' (...) (23 years ago, 10-Feb-02, to lugnet.cad.dev)
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Message is in Reply To:
| | A comprehensive LDraw object model
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| Hey folks, I think we need to figure out a comprehensive LDraw object model. Something that can be presented simply, and easily ported to various modern programming languages. A comprehensive class diagram would be a great start, and some code to (...) (23 years ago, 9-Feb-02, to lugnet.cad.dev)
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