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 21:41:21 GMT
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Viewed:
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16828 times
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In lugnet.cad.mlcad, Kevin L. Clague wrote:
> 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?
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
>
> Kevin
>
> >
> > Or did I missunderstood your question?
> >
> > cu
> > mikeheide
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Message is in Reply To:
 | | Re: Mirror Building [DAT]
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| (...) 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> (...) (16 years ago, 30-Mar-09, to lugnet.cad.mlcad)
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