Subject:
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Re: Weird Logo Issue at L3P Quality Level 3
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Newsgroups:
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lugnet.cad.ray
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Date:
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Fri, 6 Sep 2002 15:25:34 GMT
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Viewed:
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677 times
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In lugnet.cad.ray, Travis Cobbs wrote:
> In lugnet.cad.ray, Richard Marchetti writes:
> > Hey Y'all:
> >
> > If you render the element 4869.dat with L3PAO quality level 3, as far as I
> > can see you get the logo reversed. Other elements render fine. See:
> >
> > http://www.ozbricks.com/blaktron/misc/badlogo.jpg
>
> This is due to a mirror matrix being used somewhere in the part. The final
> matrix that represents that stud is mirrored (meaning either 1 or 3 of the
> axes are flipped). You should get the same problem if you render both of
> the classic space wing pieces. One of them will have correct logos, the
> other won't, because one of the files is just a reference to the other with
> a mirror matrix applied.
>
> According to a post Lars made not too long ago about L3P, this is inherent
> in the way that L3P generates the POV file; the only way to detect that a
> stud has been mirrored is to "flatten" out the entire file, and keep track
> of mirroring along the way. L3P uses the matrix transformation support
> built into the POV file format to reproduce the same matrix transformations
> from the LDraw files, so he has no way to detect the mirroring.
Considering the usefulness of modeling mirrored parts this way (one file
just references the other file) (it saves time and bytes), I'd say this
is a problem that needs resolution in software. I *think* it could
addressed with a POV-Ray macro, but I haven't seriously played with
POV-Ray in so long, I wouldn't know where to start.
Steve
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Message has 1 Reply:
 | | Re: Weird Logo Issue at L3P Quality Level 3
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| (...) I believe that Lars agrees with you regarding the fact that we can't expect parts not to use mirroring. However, based on his knowledge of POV, fixing this would require a complete change in the way L3P works. It would have to internally (...) (22 years ago, 6-Sep-02, to lugnet.cad.ray)
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Message is in Reply To:
| | Re: Weird Logo Issue at L3P Quality Level 3
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| (...) matrix that represents that stud is mirrored (meaning either 1 or 3 of the axes are flipped). You should get the same problem if you render both of the classic space wing pieces. One of them will have correct logos, the other won't, because (...) (22 years ago, 6-Sep-02, to lugnet.cad.ray)
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