Subject:
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Re: Things that are hard to do with LDraw and building instructions
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Newsgroups:
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lugnet.cad, lugnet.cad.mlcad
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Date:
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Fri, 11 Mar 2005 20:40:17 GMT
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Viewed:
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9648 times
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In lugnet.cad, Michael Lachmann wrote:
> In lugnet.cad, Kevin L. Clague wrote:
> > Whenver I build a LEGO model, I always pay attention to things that
> > they can do that we cannot, or we cannot do easily. One of the
> > things that is very hard to do is, change the shape, orientation or
> > location of a part added in previous steps.
>
> For that I've introduced the BUFFER EXCHANGE command, see developer
> specification on my web-page
> (http://mlcad.lm-software.com/Specification_V2.0.pdf).
> With that you can do exactly that. You might need GHOST commands as well.
> Also have a look at the
> sample models "Waggon1", "Waggon 2" ... I've provided which makes use of
> this features.
Yeah, in his first post Kevin said you could use Buffer Exchange
and Ghost to acheive the effect, but it's not easy. This might
be because those commands work on a series of images, but he's more
comfortable thinking in terms of manipulating the model. I know
I am.
With images, you restore an old image state and rebuild all the
layers with some changes to get a new image. That involves a lot
of repetition. With the model you just change the bit you want
and let the speedy graphics board/engine redraw the whole thing.
0 SUBSTITUTE "original group, part, or line-number" "new group or part"
This could redraw the entire model using the final version of the
hoses.
0 MOVE x y z a b c d e f g h i "some group, part, or line-number"
This would redraw the entire model with all the hoses somewhere else.
I've thought about this off and on ever since I tinkered with
accepting the ldraw file via stdin on ldglite. I guess I always
wanted to turn it something you could run through a UNIX pipe.
cat foo.ldr macro.ldr | ldglite...
If all the LEDIT commands were implemented as meta-commands you
could do some really cool stuff with a pipe.
Anyhow, it's something to think about.
Enjoy,
Don
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