Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Mirror Building
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Newsgroups:
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lugnet.cad.mlcad
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Date:
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Mon, 30 Mar 2009 18:30:13 GMT
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Viewed:
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16763 times
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In lugnet.cad.mlcad, Michael Heidemann wrote:
> In lugnet.cad.mlcad, Cristian Sala wrote:
> > hello guys,
> >
> > I want to know if someone has ever thinked about doing a program to mirror a
> > model!
> > in other words, when you build a symmetrix model, you build only one side
> > and then mirror it to the other side
> >
> > thank you
> > Cristian
>
>
> Why using a special program?
>
> First build the half of your model.
> This model is then referenced by the main file with a line like
> 1 16 0 0 0 1 0 0 0 1 0 0 0 1 modelhalf.dat
>
> The next line is then
> 1 16 0 0 0 1 0 0 0 -1 0 0 0 1 modelhalf.dat
>
> Got it!
Christian,
Mike is showing you a very nice magic trick that can be performed using the
rotation matrix associated with each part added in an LDraw model.
An LDraw type 1 line has this format:
1 <color> <x> <y> <z> <a> <b> <c> <d> <e> <f> <g> <h> <i> <type>
<a> through <i> are the rotation matrix:
<a> <b> <c>
<d> <e> <f>
<g> <h> <i>
A matrix that does no rotation is:
1 0 0
0 1 0
0 0 1
Mike changed this to:
1 0 0
0 -1 0
0 0 1
Mike, how does this create a mirror image about the Y axis?
Kevin
>
> Or did I missunderstood your question?
>
> cu
> mikeheide
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Message has 1 Reply:
 | | Re: Mirror Building [DAT]
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| (...) You are right, my fault. It should be for the second line: The next line is then 1 16 0 0 0 -1 0 0 0 1 0 0 0 1 modelhalf.dat Sorry for any trouble made by this. cu mikeheide (...) (16 years ago, 30-Mar-09, to lugnet.cad.mlcad)
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Message is in Reply To:
| | Re: Mirror Building [DAT]
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| (...) Why using a special program? First build the half of your model. This model is then referenced by the main file with a line like 1 16 0 0 0 1 0 0 0 1 0 0 0 1 modelhalf.dat The next line is then 1 16 0 0 0 1 0 0 0 -1 0 0 0 1 modelhalf.dat Got (...) (16 years ago, 29-Mar-09, to lugnet.cad.mlcad)
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