Subject:
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Re: Mirrored parts and studs
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 2 Jul 2003 18:54:17 GMT
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Viewed:
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1775 times
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In lugnet.cad.dev, Don Heyse wrote:
> Yeah, I did a search for determinant and found your note. I tried
> the on-the-fly fix in ldglite with the L3 structs and it seems to work,
> although I'm not sure I'm applying the fix correctly. Is it really
> as simple as multiplying some matrix by -1? I must have been applying
> the -1 to the wrong matrix, so I went with mirror around the Z axis
> transform instead. Can you point me to the ldview code that does this?
> I'm feeling rather lazy today, asking for help before looking for
> myself...
I don't actually do any transformations in LDView to get the logos right. I
just detect the mirroring (by tracking negative determinants and flipping the
mirrored bit every time I see one) and modify my texture coordinates to
un-mirror (horizontally) if the stud has been mirrored. You can take a look at
the genTextureCoords method in TGLStudLogo.cpp if your interested, but I don't
think it will really help you.
--Travis
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Message has 1 Reply:
 | | Re: Mirrored parts and studs
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| (...) Actually that does help a bit. It looks like you aren't concerned with whether the logo faces the same direction as on the actual part, you're just ensuring that it's readable. That makes me feel better about my solution. By the way, why do (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Mirrored parts and studs
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| (...) Yeah, I did a search for determinant and found your note. I tried the on-the-fly fix in ldglite with the L3 structs and it seems to work, although I'm not sure I'm applying the fix correctly. Is it really as simple as multiplying some matrix (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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