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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Sun, 13 Mar 2005 14:12:36 GMT
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Viewed:
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9976 times
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In lugnet.cad, Don Heyse wrote:
> 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.
Since LPub is not a renderer, it in fact does deal with models. Buffer exchange
in LPub saves/restores the model up to the buffer exchange, not the images from
steps.
>
> 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 gets tricky...... I don't know how you can create a new group that isn't
already in the model... I simply think of the above as a removal of a group and
addition of a new part.
Groups can span steps, which makes it tricky to know where to put the
substituted group with respect to the steps.
>
> 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"
I can see hoe this works though, because you can translate and rotate all the
parts within a group. How do you specify the rotation point?
>
> This would redraw the entire model with all the hoses somewhere else.
I was merely thinking of something like
0 LPUB REMOVE "some group"
from here I could add a new part, be it a fixed shape part or a composite part
like something LSynth would crank out.
I would enclose it in:
LPUB PLI BEGIN IGN
LPUB PLI END
or its depricated form:
PLIST BEGIN IGNORE
PLIST END
>
> 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.
I've thought about pipes as well, where each segment of the pipe takes options
to modify the pipe's behavior.
>
> Anyhow, it's something to think about.
>
> Enjoy,
>
> Don
Kevin
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